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However, they commonly exhibit voltage fade, a gradually diminishing discharge voltage on extended cycling. Recent research has shown that, on the first charge, oxidation of O 2ions forms O 2 molecules trapped in nano-sized voids within the structure, which can be fully reduced to O 2on the subsequent discharge. Here we show that the loss of O-redox capacity on cycling and therefore voltage fade arises from a combination of a reduction in the reversibility of the O 2/O2 redox process and O 2 loss. The closed voids that trap O 2 grow on cycling, rendering more of the trapped O 2 electrochemically inactive. The size and density of voids leads to cracking of the particles and open voids at the surfaces, releasing O 2 . Our findings implicate the thermodynamic driving force to form O 2 as the root cause of transition metal migration, void formation and consequently voltage fade in Li-rich cathodes.", "text_preview": "Oxygen redox cathodes, such as Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, deliver higher energy densities than those based on transition metal redox alone. However, they commonly exhibit voltage fade, a gradually diminishing disch…", "word_count": 176, "cleaned_text": "Oxygen redox cathodes, such as Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, deliver higher energy densities than those based on transition metal redox alone. However, they commonly exhibit voltage fade, a gradually diminishing discharge voltage on extended cycling. Recent research has shown that, on the first charge, oxidation of O 2ions forms O 2 molecules trapped in nano-sized voids within the structure, which can be fully reduced to O 2on the subsequent discharge. Here we show that the loss of O-redox capacity on cycling and therefore voltage fade arises from a combination of a reduction in the reversibility of the O 2/O2 redox process and O 2 loss. The closed voids that trap O 2 grow on cycling, rendering more of the trapped O 2 electrochemically inactive. The size and density of voids leads to cracking of the particles and open voids at the surfaces, releasing O 2 . Our findings implicate the thermodynamic driving force to form O 2 as the root cause of transition metal migration, void formation and consequently voltage fade in Li-rich cathodes.", "cleaned_text_preview": "Oxygen redox cathodes, such as Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, deliver higher energy densities than those based on transition metal redox alone. However, they commonly exhibit voltage fade, a gradually diminishing disch…", "included_in_body": true, "body_decision_reason": "body_before_non_intro_heading", "parser_body_decision_reason": "body_before_non_intro_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p1:body_region:1", "role_guess": "body", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.056, "bottom": 0.0, "left": 0.141, "right": 0.0 }, "excluded_risk_level": null, "region_id": "p1:page_body:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/11", "page": 1, "label": "text", "order": 11000, "source_page_order": 12, "layout_order": 11, "layout_page_order": 12, "bbox": [ 39.69, 501.06, 256.71, 82.91 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Li-rich cathodes can deliver higher capacities than stoichiometric cathodes (up to 300 mAh g -1 versus ~220 mAh g -1 for LiNi 0.8 Co0.1 Mn0.1 O2), supported by the participation of both transition metal (TM) redox and O-redox 1-5 . However, the average voltage of the first discharge (~3.6 V) gradually diminishes and the load curve develops a step-like profile as the material is cycled. This 'voltage fade' phenomenon leads to a continuous loss of energy density over cycling, a disadvantage for commercialization of these materials.", "text_preview": "Li-rich cathodes can deliver higher capacities than stoichiometric cathodes (up to 300 mAh g -1 versus ~220 mAh g -1 for LiNi 0.8 Co0.1 Mn0.1 O2), supported by the participation of both transition metal (TM) redox and O…", "word_count": 86, "cleaned_text": "Li-rich cathodes can deliver higher capacities than stoichiometric cathodes (up to 300 mAh g -1 versus ~220 mAh g -1 for LiNi 0.8 Co0.1 Mn0.1 O2), supported by the participation of both transition metal (TM) redox and O-redox 1-5 . However, the average voltage of the first discharge (~3.6 V) gradually diminishes and the load curve develops a step-like profile as the material is cycled. This 'voltage fade' phenomenon leads to a continuous loss of energy density over cycling, a disadvantage for commercialization of these materials.", "cleaned_text_preview": "Li-rich cathodes can deliver higher capacities than stoichiometric cathodes (up to 300 mAh g -1 versus ~220 mAh g -1 for LiNi 0.8 Co0.1 Mn0.1 O2), supported by the participation of both transition metal (TM) redox and O…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p1:body_region:0", "role_guess": "body", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.124, "bottom": 0.0, "left": 0.179, "right": 0.013 }, "excluded_risk_level": null, "region_id": "p1:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/12", "page": 1, "label": "text", "order": 12000, "source_page_order": 13, "layout_order": 12, "layout_page_order": 13, "bbox": [ 39.69, 587.06, 256.63, 115.16 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "One well-studied aspect of voltage fade is the gradual change in the redox reactions on the TMs. Over the first cycle, Co 3+/4+ and Ni 2+/3+/4+ are accepted to be the primary TM redox reactions in Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, with Mn remaining predominantly +4 (refs. 6-9). Over cycling, several studies have reported the increasing participation of low voltage Mn 3+/4+ (refs. 10-12) and more recently Co 2+/3+ (ref. 13). Such pronounced TM reduction is also more generally observed across a range of 3 d and 4 d cathodes and has been linked with irreversible out-of-plane TM migration and voltage fade 14-17 . While it appears that the increasing contribution of lower-voltage TM redox couples accompanies voltage fade, so far the underlying cause of voltage fade remains unclear.", "text_preview": "One well-studied aspect of voltage fade is the gradual change in the redox reactions on the TMs. Over the first cycle, Co 3+/4+ and Ni 2+/3+/4+ are accepted to be the primary TM redox reactions in Li 1.2 Ni0.13 Co0.13 M…", "word_count": 130, "cleaned_text": "One well-studied aspect of voltage fade is the gradual change in the redox reactions on the TMs. Over the first cycle, Co 3+/4+ and Ni 2+/3+/4+ are accepted to be the primary TM redox reactions in Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, with Mn remaining predominantly +4 (refs. 6-9). Over cycling, several studies have reported the increasing participation of low voltage Mn 3+/4+ (refs. 10-12) and more recently Co 2+/3+ (ref. 13). Such pronounced TM reduction is also more generally observed across a range of 3 d and 4 d cathodes and has been linked with irreversible out-of-plane TM migration and voltage fade 14-17 . While it appears that the increasing contribution of lower-voltage TM redox couples accompanies voltage fade, so far the underlying cause of voltage fade remains unclear.", "cleaned_text_preview": "One well-studied aspect of voltage fade is the gradual change in the redox reactions on the TMs. Over the first cycle, Co 3+/4+ and Ni 2+/3+/4+ are accepted to be the primary TM redox reactions in Li 1.2 Ni0.13 Co0.13 M…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p1:body_region:0", "role_guess": "body", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.112, "bottom": 0.1, "left": 0.064, "right": 0.026 }, "excluded_risk_level": null, "region_id": "p1:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/13#prov0", "page": 1, "label": "text", "order": 13000, "source_page_order": 14, "layout_order": 13, "layout_page_order": 14, "bbox": [ 306.14, 499.94, 256.69, 203.25 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "A reduction in Li + diffusivity on cycling, induced by, for example, structure disordering to form spinel or rocksalt-like surface layers 18-24 , could lead to a reduction in discharge voltage under the normal conditions of galvanostatic cycling between fixed voltage limits. However, such a reduction would be a kinetic overpotential. Galvanostatic intermittent titration technique measurements have shown that the voltage fade is predominantly not due to a larger overpotential, but is rather a thermodynamic voltage loss 25,26 . In terms of structural changes, previous studies have shown that the bulk structural reconfiguration is even more severe than the surface. The formation of nanopores has been identified in cycled materials by scanning transmission electron microscopy (STEM) and three-dimensional tomography 13,27 , and He pycnometry measurements have revealed a gradual decrease in the material density with cycling 28 . Chapman and co-workers also identified the growth of nanopores within the bulk on cycling with small-angle X-ray scattering (SAXS) measurements, but X-ray pair distribution function measurements could not determine whether they were filled or empty 29 . We showed recently, across a range of O-redox compounds, including Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, that O 2oxidation results", "text_preview": "A reduction in Li + diffusivity on cycling, induced by, for example, structure disordering to form spinel or rocksalt-like surface layers 18-24 , could lead to a reduction in discharge voltage under the normal condition…", "word_count": 195, "cleaned_text": "A reduction in Li + diffusivity on cycling, induced by, for example, structure disordering to form spinel or rocksalt-like surface layers 18-24 , could lead to a reduction in discharge voltage under the normal conditions of galvanostatic cycling between fixed voltage limits. However, such a reduction would be a kinetic overpotential. Galvanostatic intermittent titration technique measurements have shown that the voltage fade is predominantly not due to a larger overpotential, but is rather a thermodynamic voltage loss 25,26 . In terms of structural changes, previous studies have shown that the bulk structural reconfiguration is even more severe than the surface. The formation of nanopores has been identified in cycled materials by scanning transmission electron microscopy (STEM) and three-dimensional tomography 13,27 , and He pycnometry measurements have revealed a gradual decrease in the material density with cycling 28 . Chapman and co-workers also identified the growth of nanopores within the bulk on cycling with small-angle X-ray scattering (SAXS) measurements, but X-ray pair distribution function measurements could not determine whether they were filled or empty 29 . We showed recently, across a range of O-redox compounds, including Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, that O 2oxidation results", "cleaned_text_preview": "A reduction in Li + diffusivity on cycling, induced by, for example, structure disordering to form spinel or rocksalt-like surface layers 18-24 , could lead to a reduction in discharge voltage under the normal condition…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p1:body_region:1", "role_guess": "body", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.022, "bottom": 0.019, "left": 0.103, "right": 0.013 }, "excluded_risk_level": null, "region_id": "p1:page_body:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/14", "page": 1, "label": "footnote", "order": 14000, "source_page_order": 15, "layout_order": 14, "layout_page_order": 15, "bbox": [ 39.69, 726.36, 448.43, 7.62 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "1 Department of Materials, University of Oxford, Oxford, UK. 2 The Faraday Institution, Didcot, UK. 3 Diamond Light Source, Didcot, UK.", "text_preview": "1 Department of Materials, University of Oxford, Oxford, UK. 2 The Faraday Institution, Didcot, UK. 3 Diamond Light Source, Didcot, UK.", "word_count": 21, "cleaned_text": "1 Department of Materials, University of Oxford, Oxford, UK. 2 The Faraday Institution, Didcot, UK. 3 Diamond Light Source, Didcot, UK.", "cleaned_text_preview": "1 Department of Materials, University of Oxford, Oxford, UK. 2 The Faraday Institution, Didcot, UK. 3 Diamond Light Source, Didcot, UK.", "included_in_body": false, "body_decision_reason": "first_page_metadata", "parser_body_decision_reason": "first_page_metadata", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p1:body_region:0", "role_guess": "footnote", "zone": "bottom_margin", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": true, "metadata_line": true, "affiliation_block": false, 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these materials and can be reduced back to O 2on discharge 30-32 . Following directly the fate of this O 2 over cycling is critical to understanding the growth of nanopores and ultimately to explaining the origin of voltage fade.", "text_preview": "in the formation of molecular O 2 that is primarily trapped in small voids in the bulk of these materials and can be reduced back to O 2on discharge 30-32 . Following directly the fate of this O 2 over cycling is critic…", "word_count": 58, "cleaned_text": "in the formation of molecular O 2 that is primarily trapped in small voids in the bulk of these materials and can be reduced back to O 2on discharge 30-32 . Following directly the fate of this O 2 over cycling is critical to understanding the growth of nanopores and ultimately to explaining the origin of voltage fade.", "cleaned_text_preview": "in the formation of molecular O 2 that is primarily trapped in small voids in the bulk of these materials and can be reduced back to O 2on discharge 30-32 . Following directly the fate of this O 2 over cycling is critic…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:0", "role_guess": "body", "zone": "top_margin", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.11, "bottom": 0.081, "left": 0.141, "right": 0.026 }, "excluded_risk_level": null, "region_id": "p2:top_margin:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/20", "page": 2, "label": "text", "order": 20000, "source_page_order": 4, "layout_order": 20, "layout_page_order": 3, "bbox": [ 39.69, 103.31, 256.76, 168.91 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "In this Article, we follow directly and measure quantitatively the trapped O2 over cycling using high-resolution resonant inelastic X-ray scattering (RIXS) spectroscopy. We show that the amount of trapped O2 formed on charge gradually diminishes over cycling and that the trapped O2 that is formed is increasingly difficult to reduce back to O 2on discharge. As the voids containing O 2 grow, 17 O nuclear magnetic resonance (NMR) data indicate thicker regions of insulating Li-O 2form on the void surfaces, consistent with the O 2 becoming increasingly difficult to reduce. 129 Xe NMR and Brunauer-Emmett-Teller (BET) reveal increasing amounts of open voids at or near the surfaces over cycling, suggesting that as the voids grow large and the particle microstructure weakens, the particles crack releasing O 2 . Together, the accumulation of electrochemically inactive O 2 in the particles and release of O 2 from the opening of voids near the surface leads to reduction in the O-redox capacity. The loss of O 2/O2 redox capacity, which occurs primarily at potentials greater than 3 V, explains the observed voltage fade.", "text_preview": "In this Article, we follow directly and measure quantitatively the trapped O2 over cycling using high-resolution resonant inelastic X-ray scattering (RIXS) spectroscopy. We show that the amount of trapped O2 formed on c…", "word_count": 180, "cleaned_text": "In this Article, we follow directly and measure quantitatively the trapped O2 over cycling using high-resolution resonant inelastic X-ray scattering (RIXS) spectroscopy. We show that the amount of trapped O2 formed on charge gradually diminishes over cycling and that the trapped O2 that is formed is increasingly difficult to reduce back to O 2on discharge. As the voids containing O 2 grow, 17 O nuclear magnetic resonance (NMR) data indicate thicker regions of insulating Li-O 2form on the void surfaces, consistent with the O 2 becoming increasingly difficult to reduce. 129 Xe NMR and Brunauer-Emmett-Teller (BET) reveal increasing amounts of open voids at or near the surfaces over cycling, suggesting that as the voids grow large and the particle microstructure weakens, the particles crack releasing O 2 . Together, the accumulation of electrochemically inactive O 2 in the particles and release of O 2 from the opening of voids near the surface leads to reduction in the O-redox capacity. The loss of O 2/O2 redox capacity, which occurs primarily at potentials greater than 3 V, explains the observed voltage fade.", "cleaned_text_preview": "In this Article, we follow directly and measure quantitatively the trapped O2 over cycling using high-resolution resonant inelastic X-ray scattering (RIXS) spectroscopy. We show that the amount of trapped O2 formed on c…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:0", "role_guess": "body", "zone": "front_matter", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.101, "bottom": 0.101, "left": 0.167, "right": 0.026 }, "excluded_risk_level": null, "region_id": "p2:front_matter:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/21", "page": 2, "label": "section_header", "order": 21000, "source_page_order": 5, "layout_order": 21, "layout_page_order": 4, "bbox": [ 39.69, 284.25, 157.2, 21.97 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Voltage fade characteristics in Li 1.2 Ni0.13 Co0.13Mn0.54O2", "text_preview": "Voltage fade characteristics in Li 1.2 Ni0.13 Co0.13Mn0.54O2", "word_count": 8, "cleaned_text": "Voltage fade characteristics in Li 1.2 Ni0.13 Co0.13Mn0.54O2", "cleaned_text_preview": "Voltage fade characteristics in Li 1.2 Ni0.13 Co0.13Mn0.54O2", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:0", "role_guess": "body_heading", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.075, "bottom": 0.059, "left": 0.137, "right": 0.0 }, "excluded_risk_level": "low", "region_id": "p2:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/22", "page": 2, "label": "text", "order": 22000, "source_page_order": 6, "layout_order": 22, "layout_page_order": 5, "bbox": [ 39.69, 307.56, 256.73, 330.16 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Samples of Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 were prepared by a co-precipitation synthesis (Methods). The composition was checked by inductively coupled plasma optical emission spectroscopy (Extended Data Table 1) and energy-dispersive X-ray spectroscopy (Extended Data Figs. 1 and 2), morphology by scanning electron microscopy (Extended Data Figs. 1 and 2) and structure by powder X-ray diffraction (PXRD; Fig. 1b and Extended Data Table 2). The structure of Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 involves O3-type stacking of the oxide layers, with a honeycomb arrangement of the TM and Li ions in the TM layer (Fig. 1a). The electrochemical load curves from the 1st to the 100th cycle are plotted in Fig. 1c. After the voltage plateau seen on the first charge, the load curve develops a continuous, sloping voltage profile. We have shown that this dramatic change is accompanied by the irreversible loss of honeycomb ordering to form vacancy clusters driven by the formation of molecular O 2 (ref. 31). By the end of the first cycle, there is little evidence of the honeycomb superstructure peaks remaining in PXRD and negligible signal intensity to monitor over extended cycling. For this reason, the superstructure peaks were not included in our refinements here. From the 2nd to the 100th cycle, the load curve undergoes further changes, with a higher proportion of capacity at lower voltage on discharge, that is, voltage fade (Fig. 1c). This lowering of the average discharge voltage from the 2nd to the 100th cycle follows the same trend as previous reports of voltage fade on similar compounds 16,33 . A degree of capacity fade is also observed, similar to previously reported materials prepared in the same way 29,34-36 . Cycling was performed at a rate of 100 mA g -1 throughout the study. To confirm the voltage and capacity fade observed do not arise from kinetic limitations, cycling data were also collected at a lower rate of 20 mA g -1 over 100 cycles (Extended Data Fig. 2). These data show a very similar degree of voltage and capacity fade, confirming that these phenomena arise from bulk thermodynamic properties rather than kinetics.", "text_preview": "Samples of Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 were prepared by a co-precipitation synthesis (Methods). The composition was checked by inductively coupled plasma optical emission spectroscopy (Extended Data Table 1) and ener…", "word_count": 354, "cleaned_text": "Samples of Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 were prepared by a co-precipitation synthesis (Methods). The composition was checked by inductively coupled plasma optical emission spectroscopy (Extended Data Table 1) and energy-dispersive X-ray spectroscopy (Extended Data Figs. 1 and 2), morphology by scanning electron microscopy (Extended Data Figs. 1 and 2) and structure by powder X-ray diffraction (PXRD; Fig. 1b and Extended Data Table 2). The structure of Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 involves O3-type stacking of the oxide layers, with a honeycomb arrangement of the TM and Li ions in the TM layer (Fig. 1a). The electrochemical load curves from the 1st to the 100th cycle are plotted in Fig. 1c. After the voltage plateau seen on the first charge, the load curve develops a continuous, sloping voltage profile. We have shown that this dramatic change is accompanied by the irreversible loss of honeycomb ordering to form vacancy clusters driven by the formation of molecular O 2 (ref. 31). By the end of the first cycle, there is little evidence of the honeycomb superstructure peaks remaining in PXRD and negligible signal intensity to monitor over extended cycling. For this reason, the superstructure peaks were not included in our refinements here. From the 2nd to the 100th cycle, the load curve undergoes further changes, with a higher proportion of capacity at lower voltage on discharge, that is, voltage fade (Fig. 1c). This lowering of the average discharge voltage from the 2nd to the 100th cycle follows the same trend as previous reports of voltage fade on similar compounds 16,33 . A degree of capacity fade is also observed, similar to previously reported materials prepared in the same way 29,34-36 . Cycling was performed at a rate of 100 mA g -1 throughout the study. To confirm the voltage and capacity fade observed do not arise from kinetic limitations, cycling data were also collected at a lower rate of 20 mA g -1 over 100 cycles (Extended Data Fig. 2). These data show a very similar degree of voltage and capacity fade, confirming that these phenomena arise from bulk thermodynamic properties rather than kinetics.", "cleaned_text_preview": "Samples of Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 were prepared by a co-precipitation synthesis (Methods). The composition was checked by inductively coupled plasma optical emission spectroscopy (Extended Data Table 1) and ener…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:0", "role_guess": "body", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.091, "bottom": 0.0, "left": 0.192, "right": 0.0 }, "excluded_risk_level": null, "region_id": "p2:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/23", "page": 2, "label": "section_header", "order": 23000, "source_page_order": 7, "layout_order": 23, "layout_page_order": 6, "bbox": [ 39.69, 649.75, 131.28, 9.95 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Redox changes on cycling", "text_preview": "Redox changes on cycling", "word_count": 4, "cleaned_text": "Redox changes on cycling", "cleaned_text_preview": "Redox changes on cycling", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:0", "role_guess": "body_heading", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.158, "bottom": 0.042, "left": 0.178, "right": 0.289 }, "excluded_risk_level": "low", "region_id": "p2:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/24", "page": 2, "label": "text", "order": 24000, "source_page_order": 8, "layout_order": 24, "layout_page_order": 7, "bbox": [ 39.69, 661.19, 256.6, 85.0 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "We showed previously, using high-resolution RIXS and 17 O NMR, that molecular O2 is formed during O 2oxidation in Li-rich cathodes 31 . To follow the changes in the amount of molecular O 2 that is formed on cycling, we employed quantitative high-resolution RIXS at the O K edge. In the high resolution RIXS spectra, there are two main features associated with molecular O 2 : an energy loss feature at ~8 eV, and a series of vibrational progression peaks propagating from the elastic RIXS peak at 0 eV. To track the relative amount of O 2 , the area under the vibrational", "text_preview": "We showed previously, using high-resolution RIXS and 17 O NMR, that molecular O2 is formed during O 2oxidation in Li-rich cathodes 31 . To follow the changes in the amount of molecular O 2 that is formed on cycling, we …", "word_count": 103, "cleaned_text": "We showed previously, using high-resolution RIXS and 17 O NMR, that molecular O2 is formed during O 2oxidation in Li-rich cathodes 31 . To follow the changes in the amount of molecular O 2 that is formed on cycling, we employed quantitative high-resolution RIXS at the O K edge. In the high resolution RIXS spectra, there are two main features associated with molecular O 2 : an energy loss feature at ~8 eV, and a series of vibrational progression peaks propagating from the elastic RIXS peak at 0 eV. To track the relative amount of O 2 , the area under the vibrational", "cleaned_text_preview": "We showed previously, using high-resolution RIXS and 17 O NMR, that molecular O2 is formed during O 2oxidation in Li-rich cathodes 31 . To follow the changes in the amount of molecular O 2 that is formed on cycling, we …", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:0", "role_guess": "body", "zone": "bottom_margin", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, 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"background_class": "gray", "is_gray_background": true, "has_frame_evidence": true, "edge_dark_ratios": { "top": 0.194, "bottom": 0.181, "left": 0.278, "right": 0.389 }, "excluded_risk_level": "low", "region_id": "p2:body_zone:column_2_of_2:gray", "truncation_marker": "" }, { "ref": "#/texts/84", "page": 2, "label": "caption", "order": 84000, "source_page_order": 67, "layout_order": 85, "layout_page_order": 68, "bbox": [ 306.14, 269.16, 254.8, 66.5 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Fig. 1 | Structural characterization and electrochemical data for Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. a , Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 with a layered R 3m structure, in-plane ordering of Li/Ni and Co/Mn giving rise to the honeycomb superstructure ordering. Li atoms are represented in blue, TM in purple and oxygen in red. b , PXRD data and refinement to the R 3m crystal structure. c , Load curves for Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, cycled between 2.0 V and 4.8 V at 100 mA g -1 for 100 cycles.", "text_preview": "Fig. 1 | Structural characterization and electrochemical data for Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. a , Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 with a layered R 3m structure, in-plane ordering of Li/Ni and Co/Mn giving rise to the…", "word_count": 93, "cleaned_text": "Fig. 1 | Structural characterization and electrochemical data for Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. a , Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 with a layered R 3m structure, in-plane ordering of Li/Ni and Co/Mn giving rise to the honeycomb superstructure ordering. Li atoms are represented in blue, TM in purple and oxygen in red. b , PXRD data and refinement to the R 3m crystal structure. c , Load curves for Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, cycled between 2.0 V and 4.8 V at 100 mA g -1 for 100 cycles.", "cleaned_text_preview": "Fig. 1 | Structural characterization and electrochemical data for Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. a , Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 with a layered R 3m structure, in-plane ordering of Li/Ni and Co/Mn giving rise to the…", "included_in_body": false, "body_decision_reason": "docling_caption", "parser_body_decision_reason": "docling_caption", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:1", "role_guess": "caption", "zone": "body_zone", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.125, "bottom": 0.012, "left": 0.115, "right": 0.0 }, "excluded_risk_level": "low", "region_id": "p2:body_zone:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/86", "page": 2, "label": "text", "order": 86000, "source_page_order": 68, "layout_order": 86, "layout_page_order": 69, "bbox": [ 306.14, 361.31, 256.67, 40.88 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "progression peaks (from 0.125 eV to 2.2 eV) was integrated. This feature was chosen as the peak intensity arises solely from molecular O 2 , with no contribution from the oxide ions. The analysis used to determine the amount of O 2 over cycling is described in more detail in Methods.", "text_preview": "progression peaks (from 0.125 eV to 2.2 eV) was integrated. This feature was chosen as the peak intensity arises solely from molecular O 2 , with no contribution from the oxide ions. The analysis used to determine the a…", "word_count": 51, "cleaned_text": "progression peaks (from 0.125 eV to 2.2 eV) was integrated. This feature was chosen as the peak intensity arises solely from molecular O 2 , with no contribution from the oxide ions. The analysis used to determine the amount of O 2 over cycling is described in more detail in Methods.", "cleaned_text_preview": "progression peaks (from 0.125 eV to 2.2 eV) was integrated. This feature was chosen as the peak intensity arises solely from molecular O 2 , with no contribution from the oxide ions. The analysis used to determine the a…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:1", "role_guess": "body", "zone": "body_zone", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.127, "bottom": 0.012, "left": 0.179, "right": 0.0 }, "excluded_risk_level": null, "region_id": "p2:body_zone:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/87", "page": 2, "label": "text", "order": 87000, "source_page_order": 69, "layout_order": 87, "layout_page_order": 70, "bbox": [ 306.14, 404.31, 256.66, 136.66 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "For this study, Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 was charged to specific points along the 2nd and 100th cycles, representing quarter charge (QC), half charge (HC), three-quarter charge (3QC), full charge (FC), quarter discharge (QD), half discharge (HD), three-quarter discharge (3QD) and full discharge (FD) (Fig. 2a,d). These points were defined on a fractional capacity basis of the total charge/discharge capacities of the 2nd and 100th cycles accordingly. At each state of charge, multiple RIXS scans were taken across different sample locations to minimize any effect of sample inhomogeneity, although we note there was little difference between the spectra (Extended Data Fig. 8). These scans were then averaged and plotted for both the 2nd and 100th cycles (Fig. 2b,e). The integrated signal intensity under the O 2 vibrational progression peaks was plotted as a function of charge and discharge (Fig. 2c,f).", "text_preview": "For this study, Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 was charged to specific points along the 2nd and 100th cycles, representing quarter charge (QC), half charge (HC), three-quarter charge (3QC), full charge (FC), quarter dis…", "word_count": 142, "cleaned_text": "For this study, Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 was charged to specific points along the 2nd and 100th cycles, representing quarter charge (QC), half charge (HC), three-quarter charge (3QC), full charge (FC), quarter discharge (QD), half discharge (HD), three-quarter discharge (3QD) and full discharge (FD) (Fig. 2a,d). These points were defined on a fractional capacity basis of the total charge/discharge capacities of the 2nd and 100th cycles accordingly. At each state of charge, multiple RIXS scans were taken across different sample locations to minimize any effect of sample inhomogeneity, although we note there was little difference between the spectra (Extended Data Fig. 8). These scans were then averaged and plotted for both the 2nd and 100th cycles (Fig. 2b,e). The integrated signal intensity under the O 2 vibrational progression peaks was plotted as a function of charge and discharge (Fig. 2c,f).", "cleaned_text_preview": "For this study, Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 was charged to specific points along the 2nd and 100th cycles, representing quarter charge (QC), half charge (HC), three-quarter charge (3QC), full charge (FC), quarter dis…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:1", "role_guess": "body", "zone": "body_zone", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.091, "bottom": 0.108, "left": 0.141, "right": 0.013 }, "excluded_risk_level": null, "region_id": "p2:body_zone:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/88", "page": 2, "label": "text", "order": 88000, "source_page_order": 70, "layout_order": 88, "layout_page_order": 71, "bbox": [ 306.14, 544.06, 256.69, 136.66 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "We observed substantial differences in oxygen activity over cycling. Throughout the charging process on the second cycle, the amount of O2 is seen to increase continuously over the full voltage range, which is mirrored by the decrease in O 2 over the subsequent discharge (Fig. 2c). In contrast, while the 100th charge appears to show a continuous increase in O 2 , on discharge O 2 reduction to O 2occurs between the FD and HD points on the load curve. The HD point is at ~3 V, suggesting that the O 2/O2 redox couple is primarily active above 3 V on discharge, leaving the remainder of the discharge capacity to TM reduction. This accords with other studies reporting an increased contribution of lower-voltage Co 2+/3+ and Mn 3+/4+ redox couples after cycling 13,28 . While the majority of the O 2 is observed to be reduced above 3 V, a small amount may be reduced at lower voltages.", "text_preview": "We observed substantial differences in oxygen activity over cycling. Throughout the charging process on the second cycle, the amount of O2 is seen to increase continuously over the full voltage range, which is mirrored …", "word_count": 158, "cleaned_text": "We observed substantial differences in oxygen activity over cycling. Throughout the charging process on the second cycle, the amount of O2 is seen to increase continuously over the full voltage range, which is mirrored by the decrease in O 2 over the subsequent discharge (Fig. 2c). In contrast, while the 100th charge appears to show a continuous increase in O 2 , on discharge O 2 reduction to O 2occurs between the FD and HD points on the load curve. The HD point is at ~3 V, suggesting that the O 2/O2 redox couple is primarily active above 3 V on discharge, leaving the remainder of the discharge capacity to TM reduction. This accords with other studies reporting an increased contribution of lower-voltage Co 2+/3+ and Mn 3+/4+ redox couples after cycling 13,28 . While the majority of the O 2 is observed to be reduced above 3 V, a small amount may be reduced at lower voltages.", "cleaned_text_preview": "We observed substantial differences in oxygen activity over cycling. Throughout the charging process on the second cycle, the amount of O2 is seen to increase continuously over the full voltage range, which is mirrored …", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p2:body_region:1", "role_guess": "body", "zone": "body_zone", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.112, "bottom": 0.077, "left": 0.128, "right": 0.013 }, "excluded_risk_level": null, "region_id": "p2:body_zone:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/89#prov0", "page": 2, "label": "text", "order": 89000, "source_page_order": 71, "layout_order": 89, "layout_page_order": 72, "bbox": [ 306.14, 683.81, 256.65, 62.38 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "The intensity of the oxygen signal was tracked as a function of cycle number at FC and full discharge (Fig. 3). The data in Fig. 3 reveal an overall loss in the total amount of trapped O 2 in the charged cathodes over cycling, with a 44% loss from the 2nd FC to the 100th FC. Furthermore, the amount of O 2 remaining at the end of discharge appears to increase from the 2nd to the 100th cycle (Fig. 3). The accumulation of O 2 at the", "text_preview": "The intensity of the oxygen signal was tracked as a function of cycle number at FC and full discharge (Fig. 3). The data in Fig. 3 reveal an overall loss in the total amount of trapped O 2 in the charged cathodes over c…", "word_count": 87, "cleaned_text": "The intensity of the oxygen signal was tracked as a function of cycle number at FC and full discharge (Fig. 3). The data in Fig. 3 reveal an overall loss in the total amount of trapped O 2 in the charged cathodes over cycling, with a 44% loss from the 2nd FC to the 100th FC. 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O 2 signal in", "text_preview": "Fig. 2 | Evolution in bulk O-redox activity over 2nd and 100th cycles. a , d , Load curves for the 2nd ( a ) and 100th ( d ) cycles for Li 1.2 Mn0.54 Co0.13 Ni0.13 O2, with the states of charge studied. b , e , RIXS spe…", "word_count": 80, "cleaned_text": "Fig. 2 | Evolution in bulk O-redox activity over 2nd and 100th cycles. a , d , Load curves for the 2nd ( a ) and 100th ( d ) cycles for Li 1.2 Mn0.54 Co0.13 Ni0.13 O2, with the states of charge studied. b , e , RIXS spectra at 531.5 eV collected over the 2nd ( b ) and 100th ( e ) cycles. c , f , Variation in intensity of the molecular O 2 signal in", "cleaned_text_preview": "Fig. 2 | Evolution in bulk O-redox activity over 2nd and 100th cycles. a , d , Load curves for the 2nd ( a ) and 100th ( d ) cycles for Li 1.2 Mn0.54 Co0.13 Ni0.13 O2, with the states of charge studied. b , e , RIXS spe…", "included_in_body": false, "body_decision_reason": "outside_body_flow_caption", "parser_body_decision_reason": "outside_body_flow_caption", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p3:body_region:0", "role_guess": "caption", "zone": "page_body", "column": "left_crossing", "column_index": null, "column_count": null, "flags": { "docling_non_body_label": true, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.163, "bottom": 0.021, "left": 0.107, "right": 0.024 }, "excluded_risk_level": "low", "region_id": "p3:page_body:left_crossing:white", "truncation_marker": "" }, { "ref": "#/texts/224", "page": 3, "label": "caption", "order": 224000, "source_page_order": 134, "layout_order": 223, "layout_page_order": 133, "bbox": [ 306.47, 515.49, 254.96, 26.5 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "the RIXS spectra over the 2nd ( c ) and 100th ( f ) cycles, as determined by principal component analysis (Methods). Data are presented as mean ± standard deviation with a sample size of 15. P, pristine.", "text_preview": "the RIXS spectra over the 2nd ( c ) and 100th ( f ) cycles, as determined by principal component analysis (Methods). Data are presented as mean ± standard deviation with a sample size of 15. P, pristine.", "word_count": 38, "cleaned_text": "the RIXS spectra over the 2nd ( c ) and 100th ( f ) cycles, as determined by principal component analysis (Methods). Data are presented as mean ± standard deviation with a sample size of 15. P, pristine.", "cleaned_text_preview": "the RIXS spectra over the 2nd ( c ) and 100th ( f ) cycles, as determined by principal component analysis (Methods). Data are presented as mean ± standard deviation with a sample size of 15. P, pristine.", "included_in_body": false, "body_decision_reason": "outside_body_flow_caption", "parser_body_decision_reason": "outside_body_flow_caption", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": false, "body_region_id": null, "role_guess": "caption", "zone": "page_body", "column": "right_crossing", "column_index": null, "column_count": null, "flags": { "docling_non_body_label": true, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.122, "bottom": 0.036, "left": 0.119, "right": 0.024 }, "excluded_risk_level": "low", "region_id": "p3:page_body:right_crossing:white", "truncation_marker": "" }, { "ref": "#/texts/89#prov1", "page": 3, "label": "text", "order": 89001, "source_page_order": 1, "layout_order": 224, "layout_page_order": 134, "bbox": [ 39.68, 576.31, 256.69, 169.88 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "end of discharge signals that the trapped O 2 is becoming increasingly electrochemically inactive. Taking the difference between the O 2 at the end of charge and discharge reveals that the amount of O-redox capacity diminishes from 0.48 e -per formula unit on the 2nd cycle to 0.22 e -per formula unit on the 100th cycle. As a percentage of the total charge passed O-redox diminishes from 55% on the 2nd cycle to 34% on the 100th cycle, the balance of the capacity being made up by TM redox. The loss of O-redox capacity on cycling arises in part from the formation of electrochemically inactive O 2 that is still trapped but cannot be reduced on each cycle but also from the overall loss of O 2 from the particles, reflected in the 44% loss of O 2 at the end of charge after 100 cycles (Fig. 3). The remaining active O-redox capacity on the 100th cycle (0.22 e -per formula unit) aligns with the charge passed between FC and HD, that is, the charge passed above 3 V. Overall the loss of O-redox activity, through a combination of electrochemically inactive O 2 and release of O 2 from the particles, can account for the", "text_preview": "end of discharge signals that the trapped O 2 is becoming increasingly electrochemically inactive. Taking the difference between the O 2 at the end of charge and discharge reveals that the amount of O-redox capacity dim…", "word_count": 205, "cleaned_text": "end of discharge signals that the trapped O 2 is becoming increasingly electrochemically inactive. Taking the difference between the O 2 at the end of charge and discharge reveals that the amount of O-redox capacity diminishes from 0.48 e -per formula unit on the 2nd cycle to 0.22 e -per formula unit on the 100th cycle. As a percentage of the total charge passed O-redox diminishes from 55% on the 2nd cycle to 34% on the 100th cycle, the balance of the capacity being made up by TM redox. The loss of O-redox capacity on cycling arises in part from the formation of electrochemically inactive O 2 that is still trapped but cannot be reduced on each cycle but also from the overall loss of O 2 from the particles, reflected in the 44% loss of O 2 at the end of charge after 100 cycles (Fig. 3). The remaining active O-redox capacity on the 100th cycle (0.22 e -per formula unit) aligns with the charge passed between FC and HD, that is, the charge passed above 3 V. Overall the loss of O-redox activity, through a combination of electrochemically inactive O 2 and release of O 2 from the particles, can account for the", "cleaned_text_preview": "end of discharge signals that the trapped O 2 is becoming increasingly electrochemically inactive. Taking the difference between the O 2 at the end of charge and discharge reveals that the amount of O-redox capacity dim…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p3:body_region:0", "role_guess": "body", "zone": "bottom_margin", "column": "left_crossing", "column_index": null, "column_count": null, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.117, "bottom": 0.003, "left": 0.154, "right": 0.0 }, "excluded_risk_level": null, "region_id": "p3:bottom_margin:left_crossing:white", "truncation_marker": "" }, { "ref": "#/texts/240", "page": 3, "label": "caption", "order": 240000, "source_page_order": 150, "layout_order": 225, "layout_page_order": 135, "bbox": [ 306.14, 700.46, 255.03, 44.5 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Fig. 3 | Evolution in amount of trapped O 2 over cycling. Variation in intensity of the molecular O 2 signal from RIXS over cycling in the fully charged (FC) and fully discharged (FD) states. The amount of O 2 formed in the charged materials decreases with cycling and there is increasing evidence of O 2 that is not reduced on discharge. Data are presented as mean ± standard deviation with a sample size of 15.", "text_preview": "Fig. 3 | Evolution in amount of trapped O 2 over cycling. Variation in intensity of the molecular O 2 signal from RIXS over cycling in the fully charged (FC) and fully discharged (FD) states. The amount of O 2 formed in…", "word_count": 76, "cleaned_text": "Fig. 3 | Evolution in amount of trapped O 2 over cycling. Variation in intensity of the molecular O 2 signal from RIXS over cycling in the fully charged (FC) and fully discharged (FD) states. The amount of O 2 formed in the charged materials decreases with cycling and there is increasing evidence of O 2 that is not reduced on discharge. Data are presented as mean ± standard deviation with a sample size of 15.", "cleaned_text_preview": "Fig. 3 | Evolution in amount of trapped O 2 over cycling. Variation in intensity of the molecular O 2 signal from RIXS over cycling in the fully charged (FC) and fully discharged (FD) states. 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Formation of voids and large diamagnetic Li-rich regions over cycling. a -c , ADF-STEM images showing single grains of the pristine ( a ), 2nd discharge ( b ) and 100th discharge ( c ) material showing the formation of voids about 4-12 nm in diameter over extended cycling. d , 129 Xe NMR experiments. Samples were extracted from cells and infiltrated with Xe gas to probe the open porosity. e , 129 Xe NMR of the pristine, 2nd discharge and 100th discharge materials.", "text_preview": "Fig. 4 | Formation of voids and large diamagnetic Li-rich regions over cycling. a -c , ADF-STEM images showing single grains of the pristine ( a ), 2nd discharge ( b ) and 100th discharge ( c ) material showing the form…", "word_count": 87, "cleaned_text": "Fig. 4 | Formation of voids and large diamagnetic Li-rich regions over cycling. a -c , ADF-STEM images showing single grains of the pristine ( a ), 2nd discharge ( b ) and 100th discharge ( c ) material showing the formation of voids about 4-12 nm in diameter over extended cycling. d , 129 Xe NMR experiments. Samples were extracted from cells and infiltrated with Xe gas to probe the open porosity. e , 129 Xe NMR of the pristine, 2nd discharge and 100th discharge materials.", "cleaned_text_preview": "Fig. 4 | Formation of voids and large diamagnetic Li-rich regions over cycling. a -c , ADF-STEM images showing single grains of the pristine ( a ), 2nd discharge ( b ) and 100th discharge ( c ) material showing the form…", "included_in_body": false, "body_decision_reason": "outside_body_flow_caption", "parser_body_decision_reason": "outside_body_flow_caption", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p4:body_region:0", "role_guess": "caption", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, 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Co0.13 Mn0.54 O2.", "text_preview": "reduced contribution of charge above 3 V, leading to voltage fade and much of the capacity loss on cycling Li 1.2 Ni0.13 Co0.13 Mn0.54 O2.", "word_count": 25, "cleaned_text": "reduced contribution of charge above 3 V, leading to voltage fade and much of the capacity loss on cycling Li 1.2 Ni0.13 Co0.13 Mn0.54 O2.", "cleaned_text_preview": "reduced contribution of charge above 3 V, leading to voltage fade and much of the capacity loss on cycling Li 1.2 Ni0.13 Co0.13 Mn0.54 O2.", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p4:body_region:0", "role_guess": "body", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": 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formation on cycling", "word_count": 4, "cleaned_text": "Void formation on cycling", "cleaned_text_preview": "Void formation on cycling", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p4:body_region:0", "role_guess": "body_heading", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.077, "bottom": 0.032, "left": 0.089, "right": 0.289 }, "excluded_risk_level": "low", "region_id": "p4:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/316", "page": 4, "label": "text", "order": 316000, "source_page_order": 75, "layout_order": 259, "layout_page_order": 17, "bbox": [ 39.69, 511.81, 256.67, 147.41 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "To examine the origin of the diminishing extent of O 2 formation and reduction with cycling, annular dark field (ADF)-STEM imaging was carried out to probe changes in the particle microstructure. The images shown in Fig. 4a-c and Extended Data Figs. 4 and 5 illustrate substantial changes within individual grains of Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 after 100 cycles, consistent with previous reports identifying void formation and growth using SAXS, STEM and three-dimensional tomography 13,27-29 . Comparing the images for the pristine and 2nd discharge with the 100th discharge clearly shows the development of very extensive voiding with a high density of voids, as seen by the darker areas. The voids vary from about 4-12 nm in size and appear to be distributed throughout the particle. Given the high density of voids it is likely that a number of these voids are interconnected leading to pores of larger dimensions than is apparent from STEM.", "text_preview": "To examine the origin of the diminishing extent of O 2 formation and reduction with cycling, annular dark field (ADF)-STEM imaging was carried out to probe changes in the particle microstructure. The images shown in Fig…", "word_count": 155, "cleaned_text": "To examine the origin of the diminishing extent of O 2 formation and reduction with cycling, annular dark field (ADF)-STEM imaging was carried out to probe changes in the particle microstructure. The images shown in Fig. 4a-c and Extended Data Figs. 4 and 5 illustrate substantial changes within individual grains of Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 after 100 cycles, consistent with previous reports identifying void formation and growth using SAXS, STEM and three-dimensional tomography 13,27-29 . Comparing the images for the pristine and 2nd discharge with the 100th discharge clearly shows the development of very extensive voiding with a high density of voids, as seen by the darker areas. The voids vary from about 4-12 nm in size and appear to be distributed throughout the particle. Given the high density of voids it is likely that a number of these voids are interconnected leading to pores of larger dimensions than is apparent from STEM.", "cleaned_text_preview": "To examine the origin of the diminishing extent of O 2 formation and reduction with cycling, annular dark field (ADF)-STEM imaging was carried out to probe changes in the particle microstructure. The images shown in Fig…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p4:body_region:0", "role_guess": "body", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.115, "bottom": 0.005, "left": 0.167, "right": 0.013 }, "excluded_risk_level": null, "region_id": "p4:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/317#prov0", "page": 4, "label": "text", "order": 317000, "source_page_order": 76, "layout_order": 260, "layout_page_order": 18, "bbox": [ 39.69, 662.31, 256.67, 83.88 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "To investigate the extent to which the voids are closed or open, 129 Xe NMR was used. Xenon-129 ( I = 1/2) is an inert gas with a large polarizable electron cloud, giving xenon a wide chemical shift range 37 . When 129 Xe is constrained within a void, it comes into contact with the surface of the void causing the electron cloud to be distorted and a chemical shift to be observed 38 . This shift has a well-known relationship with void size that has been experimentally determined, described in Extended Data Fig. 6 (ref. 39). Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 was first degassed under", "text_preview": "To investigate the extent to which the voids are closed or open, 129 Xe NMR was used. Xenon-129 ( I = 1/2) is an inert gas with a large polarizable electron cloud, giving xenon a wide chemical shift range 37 . When 129 …", "word_count": 107, "cleaned_text": "To investigate the extent to which the voids are closed or open, 129 Xe NMR was used. Xenon-129 ( I = 1/2) is an inert gas with a large polarizable electron cloud, giving xenon a wide chemical shift range 37 . When 129 Xe is constrained within a void, it comes into contact with the surface of the void causing the electron cloud to be distorted and a chemical shift to be observed 38 . This shift has a well-known relationship with void size that has been experimentally determined, described in Extended Data Fig. 6 (ref. 39). Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 was first degassed under", "cleaned_text_preview": "To investigate the extent to which the voids are closed or open, 129 Xe NMR was used. Xenon-129 ( I = 1/2) is an inert gas with a large polarizable electron cloud, giving xenon a wide chemical shift range 37 . 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The sharp peaks at 0 ppm in the 6 Li and slow relaxing 17 O NMR spectra indicate the formation of large diamagnetic Li-rich regions on extended cycling.", "cleaned_text_preview": "The orange region highlighted indicates the presence of open voids of 17 nm diameter and greater after 100 cycles. δ iso , isotropic chemical shift. f , g , 6 Li ( f ) and 17 O ( g ) NMR isolating slow and fast relaxing…", "included_in_body": false, "body_decision_reason": "docling_caption", "parser_body_decision_reason": "docling_caption", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p4:body_region:1", "role_guess": "caption", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.13, "bottom": 0.083, "left": 0.107, "right": 0.0 }, "excluded_risk_level": "low", "region_id": "p4:page_body:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/317#prov1", "page": 4, "label": "text", "order": 317001, "source_page_order": 77, "layout_order": 321, "layout_page_order": 79, "bbox": [ 306.14, 468.81, 256.71, 211.91 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "dynamic high vacuum for 48 h to evacuate the sample, before being flushed with xenon gas (Fig. 4d). The xenon spectra for samples of the pristine, 2nd and 100th discharge material in Fig. 4e all show resonances centred at ~10 ppm, consistent with bulk xenon gas being paramagnetically broadened due to interactions with the surface of the cathode material. The signal could arise from large (>40 nm) open pores at the surface, although no such pores are evident in the ADF-STEM. After 100 cycles, increased spectral density between 20 ppm and 50 ppm is observed in the 129 Xe NMR spectra. This signal is not present in the pristine or second cycled material, meaning new open voids with a minimum size of 17 nm are forming (Fig. 4e). This new signal would not arise if O 2 had been lost directly from the surface, only Xe atoms in a partially confined pore open to the surface experience a chemical shift and so there must be increased surface porosity. These NMR observations are supported by BET measurements which also show there is an increase in the number of open pores at the surface, >20 nm in diameter between the 2nd and 100th cycles (Extended Data Fig. 7). The somewhat larger pore sizes from NMR and BET are consistent with some of the pores seen in STEM being interconnected and hence larger than the STEM images suggest.", "text_preview": "dynamic high vacuum for 48 h to evacuate the sample, before being flushed with xenon gas (Fig. 4d). The xenon spectra for samples of the pristine, 2nd and 100th discharge material in Fig. 4e all show resonances centred …", "word_count": 235, "cleaned_text": "dynamic high vacuum for 48 h to evacuate the sample, before being flushed with xenon gas (Fig. 4d). The xenon spectra for samples of the pristine, 2nd and 100th discharge material in Fig. 4e all show resonances centred at ~10 ppm, consistent with bulk xenon gas being paramagnetically broadened due to interactions with the surface of the cathode material. The signal could arise from large (>40 nm) open pores at the surface, although no such pores are evident in the ADF-STEM. After 100 cycles, increased spectral density between 20 ppm and 50 ppm is observed in the 129 Xe NMR spectra. This signal is not present in the pristine or second cycled material, meaning new open voids with a minimum size of 17 nm are forming (Fig. 4e). This new signal would not arise if O 2 had been lost directly from the surface, only Xe atoms in a partially confined pore open to the surface experience a chemical shift and so there must be increased surface porosity. These NMR observations are supported by BET measurements which also show there is an increase in the number of open pores at the surface, >20 nm in diameter between the 2nd and 100th cycles (Extended Data Fig. 7). The somewhat larger pore sizes from NMR and BET are consistent with some of the pores seen in STEM being interconnected and hence larger than the STEM images suggest.", "cleaned_text_preview": "dynamic high vacuum for 48 h to evacuate the sample, before being flushed with xenon gas (Fig. 4d). 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The 6 Li solid-state MAS NMR of the pristine material (Fig. 4f) shows two regions of resonances; the resonance that arises from Li in the TM layer is at", "text_preview": "In addition to the 129 Xe NMR, 6 Li and 17 O solid-state magic angle spinning (MAS) NMR were used to investigate changes over cycling. The 6 Li solid-state MAS NMR of the pristine material (Fig. 4f) shows two regions of…", "word_count": 54, "cleaned_text": "In addition to the 129 Xe NMR, 6 Li and 17 O solid-state magic angle spinning (MAS) NMR were used to investigate changes over cycling. The 6 Li solid-state MAS NMR of the pristine material (Fig. 4f) shows two regions of resonances; the resonance that arises from Li in the TM layer is at", "cleaned_text_preview": "In addition to the 129 Xe NMR, 6 Li and 17 O solid-state magic angle spinning (MAS) NMR were used to investigate changes over cycling. 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"heading_kind": null, "has_front_matter_zone": false, "visual_text": true, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 223, 223, 223 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 32, "background_class": "gray", "is_gray_background": true, "has_frame_evidence": true, "edge_dark_ratios": { "top": 0.167, "bottom": 0.25, "left": 0.222, "right": 0.333 }, "excluded_risk_level": "low", "region_id": "p5:page_body:column_1_of_2:gray", "truncation_marker": "" }, { "ref": "#/texts/325", "page": 5, "label": "caption", "order": 325000, "source_page_order": 3, "layout_order": 348, "layout_page_order": 24, "bbox": [ 39.68, 327.16, 248.35, 56.5 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Fig. 5 | Partial reduction of O 2 trapped in voids to form Li-coordinated O 2on the 100th discharge. a , b , 17 O NMR spectra isolating fast ( a ) and slow ( b ) relaxing 17 O environments. The sharp peaks in a are assigned to trapped molecular O2, which decrease in intensity on discharge. There is still evidence of some residual molecular O 2 in the discharged sample, δ cg ( 17 O2) = 2,770 ppm. In b the slow relaxation 17 O is dominated by oxide environments coordinated to", "text_preview": "Fig. 5 | Partial reduction of O 2 trapped in voids to form Li-coordinated O 2on the 100th discharge. a , b , 17 O NMR spectra isolating fast ( a ) and slow ( b ) relaxing 17 O environments. The sharp peaks in a are assi…", "word_count": 94, "cleaned_text": "Fig. 5 | Partial reduction of O 2 trapped in voids to form Li-coordinated O 2on the 100th discharge. a , b , 17 O NMR spectra isolating fast ( a ) and slow ( b ) relaxing 17 O environments. The sharp peaks in a are assigned to trapped molecular O2, which decrease in intensity on discharge. There is still evidence of some residual molecular O 2 in the discharged sample, δ cg ( 17 O2) = 2,770 ppm. In b the slow relaxation 17 O is dominated by oxide environments coordinated to", "cleaned_text_preview": "Fig. 5 | Partial reduction of O 2 trapped in voids to form Li-coordinated O 2on the 100th discharge. a , b , 17 O NMR spectra isolating fast ( a ) and slow ( b ) relaxing 17 O environments. The sharp peaks in a are assi…", "included_in_body": false, "body_decision_reason": "outside_body_flow_caption", "parser_body_decision_reason": "outside_body_flow_caption", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p5:body_region:0", "role_guess": "caption", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.273, "bottom": 0.099, "left": 0.139, "right": 0.0 }, "excluded_risk_level": "low", "region_id": "p5:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/389", "page": 5, "label": "text", "order": 389000, "source_page_order": 67, "layout_order": 349, "layout_page_order": 25, "bbox": [ 39.69, 404.31, 256.61, 93.66 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "~1,500 ppm and is consistent with well-defined honeycomb ordering, and those between 400 ppm and 900 ppm are from Li in the alkali metal layers 31,40 . After two cycles, broadening of the signal and substantial shift in the centre of gravity of the resonance (from ~700 to ~350 ppm) is observed, consistent with local disordering of the cathode and clustering of Li into more diamagnetic regions with a reduced number of TM neighbours, these changes have been discussed previously 31 . After 100 cycles, a notable sharp resonance at 0 ppm is observed that is consistent with Li in an extended diamagnetic environment.", "text_preview": "~1,500 ppm and is consistent with well-defined honeycomb ordering, and those between 400 ppm and 900 ppm are from Li in the alkali metal layers 31,40 . After two cycles, broadening of the signal and substantial shift in…", "word_count": 104, "cleaned_text": "~1,500 ppm and is consistent with well-defined honeycomb ordering, and those between 400 ppm and 900 ppm are from Li in the alkali metal layers 31,40 . After two cycles, broadening of the signal and substantial shift in the centre of gravity of the resonance (from ~700 to ~350 ppm) is observed, consistent with local disordering of the cathode and clustering of Li into more diamagnetic regions with a reduced number of TM neighbours, these changes have been discussed previously 31 . After 100 cycles, a notable sharp resonance at 0 ppm is observed that is consistent with Li in an extended diamagnetic environment.", "cleaned_text_preview": "~1,500 ppm and is consistent with well-defined honeycomb ordering, and those between 400 ppm and 900 ppm are from Li in the alkali metal layers 31,40 . After two cycles, broadening of the signal and substantial shift in…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p5:body_region:0", "role_guess": "body", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.11, "bottom": 0.005, "left": 0.115, "right": 0.026 }, "excluded_risk_level": null, "region_id": "p5:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/390", "page": 5, "label": "text", "order": 390000, "source_page_order": 68, "layout_order": 350, "layout_page_order": 26, "bbox": [ 39.69, 499.94, 256.73, 180.78 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "The corresponding 17 O MAS NMR spectra (Fig. 4g) of the pristine material show a broad amorphous line shape with very limited resolution. This is attributed to a range of oxide-ion environments that are broadened due to paramagnetic interactions. After 100 cycles at the end of discharge, the spectral density of the resonance has shifted to a slightly higher frequency, suggesting TM-rich regions are forming, that is, where the oxide ions are coordinated by several TM ions (O-TM3, O-TM4…). There is also evidence of the formation of a peak at ~0 ppm. These O atoms exhibit a similar diamagnetic chemical shift in the 17 O NMR spectrum to lithia, Li 2 O. As trapped O 2 is reduced back to O 2, the Li + ions reinserted into the particles surround the O 2resulting in the nanoscopic regions of Li 2 O (refs. 31,41). This is consistent with the 100th cycle 6 Li spectrum and can be attributed to the formation of Li-rich regions in the cathode (O-Li 5 and O-Li 6 ). Together, the 17 O and 6 Li NMR suggests that the materials segregates into regions of highly paramagnetic TM-rich and diamagnetic Li-rich clusters over extended cycling.", "text_preview": "The corresponding 17 O MAS NMR spectra (Fig. 4g) of the pristine material show a broad amorphous line shape with very limited resolution. This is attributed to a range of oxide-ion environments that are broadened due to…", "word_count": 199, "cleaned_text": "The corresponding 17 O MAS NMR spectra (Fig. 4g) of the pristine material show a broad amorphous line shape with very limited resolution. This is attributed to a range of oxide-ion environments that are broadened due to paramagnetic interactions. After 100 cycles at the end of discharge, the spectral density of the resonance has shifted to a slightly higher frequency, suggesting TM-rich regions are forming, that is, where the oxide ions are coordinated by several TM ions (O-TM3, O-TM4…). There is also evidence of the formation of a peak at ~0 ppm. These O atoms exhibit a similar diamagnetic chemical shift in the 17 O NMR spectrum to lithia, Li 2 O. As trapped O 2 is reduced back to O 2, the Li + ions reinserted into the particles surround the O 2resulting in the nanoscopic regions of Li 2 O (refs. 31,41). This is consistent with the 100th cycle 6 Li spectrum and can be attributed to the formation of Li-rich regions in the cathode (O-Li 5 and O-Li 6 ). Together, the 17 O and 6 Li NMR suggests that the materials segregates into regions of highly paramagnetic TM-rich and diamagnetic Li-rich clusters over extended cycling.", "cleaned_text_preview": "The corresponding 17 O MAS NMR spectra (Fig. 4g) of the pristine material show a broad amorphous line shape with very limited resolution. This is attributed to a range of oxide-ion environments that are broadened due to…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p5:body_region:0", "role_guess": "body", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.034, "bottom": 0.031, "left": 0.141, "right": 0.038 }, "excluded_risk_level": null, "region_id": "p5:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/391", "page": 5, "label": "text", "order": 391000, "source_page_order": 69, "layout_order": 351, "layout_page_order": 27, "bbox": [ 39.69, 682.69, 256.66, 62.53 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "To probe for molecular O 2 over the 100th cycle using 17 O NMR, fast relaxing spectra (2 ms), compared with those discussed above (100 ms), were collected to selectively enhance the oxygens which experience substantial paramagnetic relaxation enhancement. O 2 molecules, possessing two unpaired electrons, are expected to have a much stronger paramagnetic relaxation enhancement than oxides. The data (Fig. 5)", "text_preview": "To probe for molecular O 2 over the 100th cycle using 17 O NMR, fast relaxing spectra (2 ms), compared with those discussed above (100 ms), were collected to selectively enhance the oxygens which experience substantial …", "word_count": 62, "cleaned_text": "To probe for molecular O 2 over the 100th cycle using 17 O NMR, fast relaxing spectra (2 ms), compared with those discussed above (100 ms), were collected to selectively enhance the oxygens which experience substantial paramagnetic relaxation enhancement. O 2 molecules, possessing two unpaired electrons, are expected to have a much stronger paramagnetic relaxation enhancement than oxides. The data (Fig. 5)", "cleaned_text_preview": "To probe for molecular O 2 over the 100th cycle using 17 O NMR, fast relaxing spectra (2 ms), compared with those discussed above (100 ms), were collected to selectively enhance the oxygens which experience substantial …", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p5:body_region:0", "role_guess": "body", "zone": "bottom_margin", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, 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"caption_continuation_used_by_asset": false }, "background_rgb": [ 206, 206, 206 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 49, "background_class": "gray", "is_gray_background": true, "has_frame_evidence": true, "edge_dark_ratios": { "top": 0.188, "bottom": 0.271, "left": 0.278, "right": 0.306 }, "excluded_risk_level": "low", "region_id": "p5:page_body:column_2_of_2:gray", "truncation_marker": "" }, { "ref": "#/texts/392", "page": 5, "label": "caption", "order": 392000, "source_page_order": 70, "layout_order": 395, "layout_page_order": 71, "bbox": [ 306.47, 326.2, 254.19, 58.27 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "paramagnetic TM ions (TM-O 2-), δ cg = 2,100-2,300 ppm. After discharge, a new 17 O environment is formed corresponding to oxide surrounded by Li (that is, Li-O 2) created by the reduction of O 2 in the voids and reinsertion of Li + into the voids coordinated by the O 2, centred at δ cg = 0 ppm. D 1 , relaxation delay. c , Large voids accommodating O2 are partially repopulated by Li + on discharge. Most O 2 is reduced to O 2but some residual O 2 remains.", "text_preview": "paramagnetic TM ions (TM-O 2-), δ cg = 2,100-2,300 ppm. After discharge, a new 17 O environment is formed corresponding to oxide surrounded by Li (that is, Li-O 2) created by the reduction of O 2 in the voids and reinse…", "word_count": 91, "cleaned_text": "paramagnetic TM ions (TM-O 2-), δ cg = 2,100-2,300 ppm. After discharge, a new 17 O environment is formed corresponding to oxide surrounded by Li (that is, Li-O 2) created by the reduction of O 2 in the voids and reinsertion of Li + into the voids coordinated by the O 2, centred at δ cg = 0 ppm. D 1 , relaxation delay. c , Large voids accommodating O2 are partially repopulated by Li + on discharge. Most O 2 is reduced to O 2but some residual O 2 remains.", "cleaned_text_preview": "paramagnetic TM ions (TM-O 2-), δ cg = 2,100-2,300 ppm. After discharge, a new 17 O environment is formed corresponding to oxide surrounded by Li (that is, Li-O 2) created by the reduction of O 2 in the voids and reinse…", "included_in_body": false, "body_decision_reason": "docling_caption", "parser_body_decision_reason": "docling_caption", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p5:body_region:1", "role_guess": "caption", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.057, "bottom": 0.0, "left": 0.103, "right": 0.0 }, "excluded_risk_level": "low", "region_id": "p5:page_body:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/393", "page": 5, "label": "text", "order": 393000, "source_page_order": 71, "layout_order": 396, "layout_page_order": 72, "bbox": [ 306.14, 404.31, 256.62, 168.91 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "show a well-defined chemical environment centred at δ cg = 2,770 ppm, where δ cg is the chemical shift centre of gravity, with a manifold of spinning sidebands, consistent with previous measurements of trapped molecular O2 (refs. 31,42). A decrease in the intensity of the O 2 resonance can be seen between the 100th charge and discharge as the O 2 is reduced to O 2; however, there is evidence of some residual O 2 present in the 100th discharged sample. These results are in accord with our RIXS measurements (Figs. 2 and 3) and indicate that O 2 is only partially reduced over the 100th cycle. The corresponding slow relaxing spectra (Fig. 5b) reveal that the 17 O diamagnetic peak arising from O 2surrounded predominantly by Li, Li-O 2, is completely absent in the 100th charge sample. This evidence supports the conclusion that the closed voids seen in ADF-STEM are filled with O 2 and that upon discharge this oxygen is partially reincorporated into the lattice as O 2in ionic Li-rich regions (Fig. 5c), accompanied by the reinsertion of Li + ions into the void space coordinated by the O 2, as we have described previously 31 .", "text_preview": "show a well-defined chemical environment centred at δ cg = 2,770 ppm, where δ cg is the chemical shift centre of gravity, with a manifold of spinning sidebands, consistent with previous measurements of trapped molecular…", "word_count": 199, "cleaned_text": "show a well-defined chemical environment centred at δ cg = 2,770 ppm, where δ cg is the chemical shift centre of gravity, with a manifold of spinning sidebands, consistent with previous measurements of trapped molecular O2 (refs. 31,42). A decrease in the intensity of the O 2 resonance can be seen between the 100th charge and discharge as the O 2 is reduced to O 2; however, there is evidence of some residual O 2 present in the 100th discharged sample. These results are in accord with our RIXS measurements (Figs. 2 and 3) and indicate that O 2 is only partially reduced over the 100th cycle. The corresponding slow relaxing spectra (Fig. 5b) reveal that the 17 O diamagnetic peak arising from O 2surrounded predominantly by Li, Li-O 2, is completely absent in the 100th charge sample. This evidence supports the conclusion that the closed voids seen in ADF-STEM are filled with O 2 and that upon discharge this oxygen is partially reincorporated into the lattice as O 2in ionic Li-rich regions (Fig. 5c), accompanied by the reinsertion of Li + ions into the void space coordinated by the O 2, as we have described previously 31 .", "cleaned_text_preview": "show a well-defined chemical environment centred at δ cg = 2,770 ppm, where δ cg is the chemical shift centre of gravity, with a manifold of spinning sidebands, consistent with previous measurements of trapped molecular…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p5:body_region:1", "role_guess": "body", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.107, "bottom": 0.01, "left": 0.141, "right": 0.0 }, "excluded_risk_level": null, "region_id": "p5:page_body:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/394", "page": 5, "label": "section_header", "order": 394000, "source_page_order": 72, "layout_order": 397, "layout_page_order": 73, "bbox": [ 306.14, 585.25, 199.96, 20.7 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "O2 loss and residual trapped O 2 explain voltage fade", "text_preview": "O2 loss and residual trapped O 2 explain voltage fade", "word_count": 10, "cleaned_text": "O2 loss and residual trapped O 2 explain voltage fade", "cleaned_text_preview": "O2 loss and residual trapped O 2 explain voltage fade", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p5:body_region:1", "role_guess": "body_heading", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.082, "bottom": 0.015, "left": 0.115, "right": 0.0 }, "excluded_risk_level": "low", "region_id": "p5:page_body:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/395", "page": 5, "label": "text", "order": 395000, "source_page_order": 73, "layout_order": 398, "layout_page_order": 74, "bbox": [ 306.14, 607.44, 256.62, 84.03 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "We showed recently, using high-resolution RIXS and 17 O NMR, that on the first cycle of the O-redox Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 material, O 2is oxidized to O 2 with the loss of honeycomb TM ordering and formation of small vacancy clusters trapping the O 2 molecules distributed throughout the particle. The formation of trapped O 2 occurs quickly on charging as evidenced by the lack of electron-hole states on the O 2sublattice. By the end of the first cycle, the trapped O 2 is completely reduced back to O 2, accounting for the reversible O-redox capacity.", "text_preview": "We showed recently, using high-resolution RIXS and 17 O NMR, that on the first cycle of the O-redox Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 material, O 2is oxidized to O 2 with the loss of honeycomb TM ordering and formation of …", "word_count": 99, "cleaned_text": "We showed recently, using high-resolution RIXS and 17 O NMR, that on the first cycle of the O-redox Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 material, O 2is oxidized to O 2 with the loss of honeycomb TM ordering and formation of small vacancy clusters trapping the O 2 molecules distributed throughout the particle. The formation of trapped O 2 occurs quickly on charging as evidenced by the lack of electron-hole states on the O 2sublattice. By the end of the first cycle, the trapped O 2 is completely reduced back to O 2, accounting for the reversible O-redox capacity.", "cleaned_text_preview": "We showed recently, using high-resolution RIXS and 17 O NMR, that on the first cycle of the O-redox Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 material, O 2is oxidized to O 2 with the loss of honeycomb TM ordering and formation of …", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p5:body_region:1", "role_guess": "body", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.043, "bottom": 0.084, "left": 0.103, "right": 0.013 }, "excluded_risk_level": null, "region_id": "p5:page_body:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/396#prov0", "page": 5, "label": "text", "order": 396000, "source_page_order": 74, "layout_order": 399, "layout_page_order": 75, "bbox": [ 306.14, 694.56, 256.76, 50.66 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "The results presented here show that, on subsequent cycling, the O-redox mechanism is not static and continues to evolve, although more gradually. On cycling, there is increasing accumulation of O 2 at the end of discharge (Fig. 3), indicating that not all O 2 formed on charge is reduced on the subsequent discharge, that is, there is a decrease", "text_preview": "The results presented here show that, on subsequent cycling, the O-redox mechanism is not static and continues to evolve, although more gradually. On cycling, there is increasing accumulation of O 2 at the end of discha…", "word_count": 59, "cleaned_text": "The results presented here show that, on subsequent cycling, the O-redox mechanism is not static and continues to evolve, although more gradually. On cycling, there is increasing accumulation of O 2 at the end of discharge (Fig. 3), indicating that not all O 2 formed on charge is reduced on the subsequent discharge, that is, there is a decrease", "cleaned_text_preview": "The results presented here show that, on subsequent cycling, the O-redox mechanism is not static and continues to evolve, although more gradually. 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Second cycle: reversible O-redox involves the formation of molecular O 2 trapped in small vacancy clusters throughout the particle. O 2 molecules are fully reduced to O 2on discharge forming small diamagnetic Li-rich regions. c , d , One-hundreth cycle: further TM migration", "text_preview": "Fig. 6 | Voltage fade mechanism. a , b , Second cycle: reversible O-redox involves the formation of molecular O 2 trapped in small vacancy clusters throughout the particle. O 2 molecules are fully reduced to O 2on disch…", "word_count": 53, "cleaned_text": "Fig. 6 | Voltage fade mechanism. a , b , Second cycle: reversible O-redox involves the formation of molecular O 2 trapped in small vacancy clusters throughout the particle. O 2 molecules are fully reduced to O 2on discharge forming small diamagnetic Li-rich regions. c , d , One-hundreth cycle: further TM migration", "cleaned_text_preview": "Fig. 6 | Voltage fade mechanism. a , b , Second cycle: reversible O-redox involves the formation of molecular O 2 trapped in small vacancy clusters throughout the particle. O 2 molecules are fully reduced to O 2on disch…", "included_in_body": false, "body_decision_reason": "outside_body_flow_caption", "parser_body_decision_reason": "outside_body_flow_caption", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p6:body_region:0", "role_guess": "caption", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.119, "bottom": 0.116, "left": 0.167, "right": 0.0 }, "excluded_risk_level": "low", "region_id": "p6:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/396#prov1", "page": 6, "label": "text", "order": 396001, "source_page_order": 1, "layout_order": 418, "layout_page_order": 18, "bbox": [ 39.69, 575.19, 256.59, 127.03 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "in the reversibility of the O 2/O2 transformation. The decrease in the amount of O2 trapped at the top of charge also signals a loss of O 2 from the particles. Together, the loss of O 2 and the decreasing reversibility of the O 2/O2 transformation lead to a loss of 0.26 e -per formula unit in O-redox capacity, corresponding to a reduction in the percentage of the capacity due to O-redox from 55% on the 2nd cycle to 34% on the 100th cycle. As the O 2/O2 couple occurs above 3 V, the loss of O-redox capacity at the expense of a higher proportion of TM capacity leads to the overall voltage loss on cycling. The decrease in the reversible O-redox capacity is also commensurate with the capacity fading on cycling, that is, the capacity loss on cycling is associated with reduction in the O-redox activity at the higher voltages and a lower average voltage.", "text_preview": "in the reversibility of the O 2/O2 transformation. The decrease in the amount of O2 trapped at the top of charge also signals a loss of O 2 from the particles. Together, the loss of O 2 and the decreasing reversibility …", "word_count": 156, "cleaned_text": "in the reversibility of the O 2/O2 transformation. The decrease in the amount of O2 trapped at the top of charge also signals a loss of O 2 from the particles. Together, the loss of O 2 and the decreasing reversibility of the O 2/O2 transformation lead to a loss of 0.26 e -per formula unit in O-redox capacity, corresponding to a reduction in the percentage of the capacity due to O-redox from 55% on the 2nd cycle to 34% on the 100th cycle. As the O 2/O2 couple occurs above 3 V, the loss of O-redox capacity at the expense of a higher proportion of TM capacity leads to the overall voltage loss on cycling. 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"word_count": 3, "cleaned_text": "trapped O 2", "cleaned_text_preview": "trapped O 2", "included_in_body": false, "body_decision_reason": "visual_text", "parser_body_decision_reason": "visual_text", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p6:body_region:0", "role_guess": "visual_text", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": true, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, 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The large voids and their high density in the particles lead to a weakening of the latter, cracking and O 2 release. It is also more difficult to reduce O2 in larger voids.", "text_preview": "leads to agglomeration and coarsening of clusters into larger voids driven by the formation of more O 2 . The large voids and their high density in the particles lead to a weakening of the latter, cracking and O 2 relea…", "word_count": 52, "cleaned_text": "leads to agglomeration and coarsening of clusters into larger voids driven by the formation of more O 2 . The large voids and their high density in the particles lead to a weakening of the latter, cracking and O 2 release. It is also more difficult to reduce O2 in larger voids.", "cleaned_text_preview": "leads to agglomeration and coarsening of clusters into larger voids driven by the formation of more O 2 . The large voids and their high density in the particles lead to a weakening of the latter, cracking and O 2 relea…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p6:body_region:1", "role_guess": "body", "zone": "page_body", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.13, "bottom": 0.04, "left": 0.167, "right": 0.012 }, "excluded_risk_level": null, "region_id": "p6:page_body:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/470#prov0", "page": 6, "label": "text", "order": 470000, "source_page_order": 74, "layout_order": 475, "layout_page_order": 75, "bbox": [ 306.14, 575.19, 256.62, 170.03 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "small-angle scattering 27-29 . Voids also manifest as a reduction in average particle density, which has been recently observed 28 . Our ADF-STEM images (Fig. 4a-c and Extended Data Figs. 4 and 5) provide additional evidence for this, showing voids develop that are about 4-12 nm in diameter within individual particles after 100 cycles. Previous studies proposed void formation on the first charge corresponding to a few vacant cation sites and therefore approximately 1 nm in diameter, implying the voids grow on cycling. Reduction of O 2 trapped in these larger voids is expected to be more difficult than in the much smaller voids present on the first and second cycles. This is in accord with the RIXS observations at the end of discharge showing increasing amounts of unreduced O2 over cycling and by 17 O NMR, which also shows evidence of residual O 2 at the end of the 100th discharge. Furthermore, our 17 O NMR study of the 100th cycle discharge process reveals that, as the trapped O 2 is reduced to O 2, diamagnetic 17 O environments form that were not present in the charged sample, indicative of O 2in ionic,", "text_preview": "small-angle scattering 27-29 . Voids also manifest as a reduction in average particle density, which has been recently observed 28 . Our ADF-STEM images (Fig. 4a-c and Extended Data Figs. 4 and 5) provide additional evi…", "word_count": 194, "cleaned_text": "small-angle scattering 27-29 . Voids also manifest as a reduction in average particle density, which has been recently observed 28 . Our ADF-STEM images (Fig. 4a-c and Extended Data Figs. 4 and 5) provide additional evidence for this, showing voids develop that are about 4-12 nm in diameter within individual particles after 100 cycles. Previous studies proposed void formation on the first charge corresponding to a few vacant cation sites and therefore approximately 1 nm in diameter, implying the voids grow on cycling. Reduction of O 2 trapped in these larger voids is expected to be more difficult than in the much smaller voids present on the first and second cycles. This is in accord with the RIXS observations at the end of discharge showing increasing amounts of unreduced O2 over cycling and by 17 O NMR, which also shows evidence of residual O 2 at the end of the 100th discharge. Furthermore, our 17 O NMR study of the 100th cycle discharge process reveals that, as the trapped O 2 is reduced to O 2, diamagnetic 17 O environments form that were not present in the charged sample, indicative of O 2in ionic,", "cleaned_text_preview": "small-angle scattering 27-29 . Voids also manifest as a reduction in average particle density, which has been recently observed 28 . 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This evidence further supports the conclusion that the closed voids formed on cycling are filled with O 2 and that on discharge some of the O 2 is reduced to O 2, which is reincorporated into the lattice along with the charge compensating reinserted Li + (Fig. 6). The insulating nature of these Li-O 2regions that will form on the walls of the void where the electrons to reduce O 2 on discharge are supplied offers an explanation for why it is increasingly difficult to reduce O2 in larger voids.", "text_preview": "Li-rich environments. This evidence further supports the conclusion that the closed voids formed on cycling are filled with O 2 and that on discharge some of the O 2 is reduced to O 2, which is reincorporated into the l…", "word_count": 92, "cleaned_text": "Li-rich environments. This evidence further supports the conclusion that the closed voids formed on cycling are filled with O 2 and that on discharge some of the O 2 is reduced to O 2, which is reincorporated into the lattice along with the charge compensating reinserted Li + (Fig. 6). The insulating nature of these Li-O 2regions that will form on the walls of the void where the electrons to reduce O 2 on discharge are supplied offers an explanation for why it is increasingly difficult to reduce O2 in larger voids.", "cleaned_text_preview": "Li-rich environments. This evidence further supports the conclusion that the closed voids formed on cycling are filled with O 2 and that on discharge some of the O 2 is reduced to O 2, which is reincorporated into the l…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p7:body_region:0", "role_guess": "body", "zone": "top_margin", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.096, "bottom": 0.038, "left": 0.154, "right": 0.013 }, "excluded_risk_level": null, "region_id": "p7:top_margin:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/475", "page": 7, "label": "text", "order": 475000, "source_page_order": 4, "layout_order": 479, "layout_page_order": 3, "bbox": [ 39.69, 134.44, 256.74, 105.53 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "The 129 Xe NMR and BET data show that the cathode particles develop increased density of open voids >17 nm in diameter at the particle surfaces on cycling. There is also a wider body of evidence showing that Li-rich NMC suffers from particle cracking, which had commonly been associated with increased lattice strain 43 . Together this suggests that the increased density of relatively large voids filled with O2 upon cycling may result in weakening and hence fracturing of the particles, releasing O 2 from open or partially open voids at or near the surfaces of the particles and explaining its loss on extended cycling release (Fig. 6).", "text_preview": "The 129 Xe NMR and BET data show that the cathode particles develop increased density of open voids >17 nm in diameter at the particle surfaces on cycling. There is also a wider body of evidence showing that Li-rich NMC…", "word_count": 108, "cleaned_text": "The 129 Xe NMR and BET data show that the cathode particles develop increased density of open voids >17 nm in diameter at the particle surfaces on cycling. There is also a wider body of evidence showing that Li-rich NMC suffers from particle cracking, which had commonly been associated with increased lattice strain 43 . Together this suggests that the increased density of relatively large voids filled with O2 upon cycling may result in weakening and hence fracturing of the particles, releasing O 2 from open or partially open voids at or near the surfaces of the particles and explaining its loss on extended cycling release (Fig. 6).", "cleaned_text_preview": "The 129 Xe NMR and BET data show that the cathode particles develop increased density of open voids >17 nm in diameter at the particle surfaces on cycling. There is also a wider body of evidence showing that Li-rich NMC…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p7:body_region:0", "role_guess": "body", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.055, "bottom": 0.019, "left": 0.064, "right": 0.038 }, "excluded_risk_level": null, "region_id": "p7:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/476", "page": 7, "label": "section_header", "order": 476000, "source_page_order": 5, "layout_order": 480, "layout_page_order": 4, "bbox": [ 39.69, 252.0, 66.19, 9.95 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Implications", "text_preview": "Implications", "word_count": 1, "cleaned_text": "Implications", "cleaned_text_preview": "Implications", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p7:body_region:0", "role_guess": "body_heading", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.067, "bottom": 0.02, "left": 0.178, "right": 0.244 }, "excluded_risk_level": "low", "region_id": "p7:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/477", "page": 7, "label": "text", "order": 477000, "source_page_order": 6, "layout_order": 481, "layout_page_order": 5, "bbox": [ 39.69, 264.56, 256.64, 72.16 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Suppressing the release of O 2 from particles by protecting the surface with coatings is known to be an effective strategy to prevent capacity fade in Li-rich cathodes and it can also suppress voltage fade to an extent. However, a key implication of our study is that surface coatings cannot eliminate voltage fade. Efforts must be directed towards bulk mitigation strategies such as avoiding O 2 formation and the appearance of voids in favour of stabilised hole states on O (ref. 32).", "text_preview": "Suppressing the release of O 2 from particles by protecting the surface with coatings is known to be an effective strategy to prevent capacity fade in Li-rich cathodes and it can also suppress voltage fade to an extent.…", "word_count": 82, "cleaned_text": "Suppressing the release of O 2 from particles by protecting the surface with coatings is known to be an effective strategy to prevent capacity fade in Li-rich cathodes and it can also suppress voltage fade to an extent. However, a key implication of our study is that surface coatings cannot eliminate voltage fade. Efforts must be directed towards bulk mitigation strategies such as avoiding O 2 formation and the appearance of voids in favour of stabilised hole states on O (ref. 32).", "cleaned_text_preview": "Suppressing the release of O 2 from particles by protecting the surface with coatings is known to be an effective strategy to prevent capacity fade in Li-rich cathodes and it can also suppress voltage fade to an extent.…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p7:body_region:0", "role_guess": "body", "zone": "page_body", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.124, "bottom": 0.077, "left": 0.111, "right": 0.042 }, "excluded_risk_level": null, "region_id": "p7:page_body:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/478", "page": 7, "label": "text", "order": 478000, "source_page_order": 7, "layout_order": 482, "layout_page_order": 6, "bbox": [ 39.69, 339.81, 256.61, 169.88 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "The oxygen redox process, which proceeds by the formation and reduction of trapped O2 molecules, becomes less prevalent on cycling Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. On charging, the O 2 formed is trapped in closed voids within the particles. The trapped O 2 becomes increasingly electrochemically inactive because the growth in size of these closed voids makes electron tunnelling between the O 2 and the void edges more difficult. The voids at or near the surface, including any new fracture surfaces due to particle cracking, are open and can vent O 2 . Together these two mechanisms result in the loss of O-redox capacity on cycling. The gradual loss of O 2 participating in the charge compensation reaction over extended cycling offers an explanation for the voltage fade phenomenon which draws together the observations of structural reorganisation, void formation, void opening and TM reduction into a single mechanism. The implication is that voltage fade mitigation strategies should focus on the bulk and suppressing the formation of O 2 .", "text_preview": "The oxygen redox process, which proceeds by the formation and reduction of trapped O2 molecules, becomes less prevalent on cycling Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. On charging, the O 2 formed is trapped in closed voids w…", "word_count": 170, "cleaned_text": "The oxygen redox process, which proceeds by the formation and reduction of trapped O2 molecules, becomes less prevalent on cycling Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. On charging, the O 2 formed is trapped in closed voids within the particles. The trapped O 2 becomes increasingly electrochemically inactive because the growth in size of these closed voids makes electron tunnelling between the O 2 and the void edges more difficult. The voids at or near the surface, including any new fracture surfaces due to particle cracking, are open and can vent O 2 . Together these two mechanisms result in the loss of O-redox capacity on cycling. The gradual loss of O 2 participating in the charge compensation reaction over extended cycling offers an explanation for the voltage fade phenomenon which draws together the observations of structural reorganisation, void formation, void opening and TM reduction into a single mechanism. The implication is that voltage fade mitigation strategies should focus on the bulk and suppressing the formation of O 2 .", "cleaned_text_preview": "The oxygen redox process, which proceeds by the formation and reduction of trapped O2 molecules, becomes less prevalent on cycling Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. 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NiNO3·6H2O (≥98%, Sigma-Aldrich), MnNO3·4H2O (≥99%, Sigma-Aldrich) and CoNO3 ·6H2 O (≥99%, Sigma-Aldrich) were dissolved in de-ionized water with a molar ratio of 0.13:0.54:0.13 to prepare a 1.5 M solution. In addition, a 1.5 M solution of Na 2 CO3 (≥99.5%, ACS reagent, Sigma-Aldrich) was prepared. The solutions were added dropwise into a beaker under continuous stirring, at a constant temperature of 40 °C and pH 7.6. After full addition of the TM solution, the beaker was left covered overnight under stirring. The resulting carbonate mix was then washed with de-ionized water, filtered and dried at 120 °C overnight. The dried mixed metal carbonate precursor was then mixed with Li 2 CO3 (≥99%, ACS reagent, Sigma-Aldrich) using a mole ratio of (Li:TM of 1:1.5) and calcined at 900 °C for 15 h under continuous O 2 flow to obtain the desired compound. A heating and cooling rate of 5 °C min -1 was used during the synthesis. 17 O-labelled samples were prepared in the same way except the final calcination step was performed under a sealed atmosphere of O2 gas (CortecNet >70 atom% 17 O).", "text_preview": "Ni0.13 Mn0.54 Co0.13 CO 3 precursors were prepared by a coprecipitation route. NiNO3·6H2O (≥98%, Sigma-Aldrich), MnNO3·4H2O (≥99%, Sigma-Aldrich) and CoNO3 ·6H2 O (≥99%, Sigma-Aldrich) were dissolved in de-ionized water…", "word_count": 196, "cleaned_text": "Ni0.13 Mn0.54 Co0.13 CO 3 precursors were prepared by a coprecipitation route. NiNO3·6H2O (≥98%, Sigma-Aldrich), MnNO3·4H2O (≥99%, Sigma-Aldrich) and CoNO3 ·6H2 O (≥99%, Sigma-Aldrich) were dissolved in de-ionized water with a molar ratio of 0.13:0.54:0.13 to prepare a 1.5 M solution. In addition, a 1.5 M solution of Na 2 CO3 (≥99.5%, ACS reagent, Sigma-Aldrich) was prepared. The solutions were added dropwise into a beaker under continuous stirring, at a constant temperature of 40 °C and pH 7.6. After full addition of the TM solution, the beaker was left covered overnight under stirring. The resulting carbonate mix was then washed with de-ionized water, filtered and dried at 120 °C overnight. The dried mixed metal carbonate precursor was then mixed with Li 2 CO3 (≥99%, ACS reagent, Sigma-Aldrich) using a mole ratio of (Li:TM of 1:1.5) and calcined at 900 °C for 15 h under continuous O 2 flow to obtain the desired compound. A heating and cooling rate of 5 °C min -1 was used during the synthesis. 17 O-labelled samples were prepared in the same way except the final calcination step was performed under a sealed atmosphere of O2 gas (CortecNet >70 atom% 17 O).", "cleaned_text_preview": "Ni0.13 Mn0.54 Co0.13 CO 3 precursors were prepared by a coprecipitation route. NiNO3·6H2O (≥98%, Sigma-Aldrich), MnNO3·4H2O (≥99%, Sigma-Aldrich) and CoNO3 ·6H2 O (≥99%, Sigma-Aldrich) were dissolved in de-ionized water…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.022, "bottom": 0.077, "left": 0.038, "right": 0.013 }, "excluded_risk_level": null, "region_id": "p9:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/539", "page": 9, "label": "section_header", "order": 539000, "source_page_order": 6, "layout_order": 543, "layout_page_order": 5, "bbox": [ 39.69, 264.2, 138.36, 8.11 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Electrochemical characterization", "text_preview": "Electrochemical characterization", "word_count": 2, "cleaned_text": "Electrochemical characterization", "cleaned_text_preview": "Electrochemical characterization", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body_heading", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": true, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.046, "bottom": 0.109, "left": 0.278, "right": 0.222 }, "excluded_risk_level": "low", "region_id": "p9:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/540", "page": 9, "label": "text", "order": 540000, "source_page_order": 7, "layout_order": 544, "layout_page_order": 6, "bbox": [ 39.69, 275.31, 256.75, 158.16 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "The electrodes were prepared by combining the active material (80 wt%), Super P carbon (10 wt%) and polytetrafluoroethylene binder (10 wt%) using a mortar and pestle. The mixture was then rolled to a thickness of about 100 μm to form self-supporting films. Electrodes were assembled into coin cells using Whatman glass fibre separators and 1 M LiPF 6 in ethylene carbonate:dimethyl carbonate 50:50 (battery grade, Sigma-Aldrich) electrolyte, with a Li metal counter electrode. A typical coin cell has an active mass loading of ~10 mg. Galvanostatic cycle testing was carried out using Maccor Series 4000. The cells and electrodes were prepared and assembled/ disassembled in the glove box under an inert atmosphere and all cycling for the characterization studies was performed using the same conditions. Cells were cycled between 2.0 V and 4.8 V versus Li + /Li at a rate of 100 mA g -1 without voltage holds, rests or formation cycling.", "text_preview": "The electrodes were prepared by combining the active material (80 wt%), Super P carbon (10 wt%) and polytetrafluoroethylene binder (10 wt%) using a mortar and pestle. The mixture was then rolled to a thickness of about …", "word_count": 153, "cleaned_text": "The electrodes were prepared by combining the active material (80 wt%), Super P carbon (10 wt%) and polytetrafluoroethylene binder (10 wt%) using a mortar and pestle. The mixture was then rolled to a thickness of about 100 μm to form self-supporting films. Electrodes were assembled into coin cells using Whatman glass fibre separators and 1 M LiPF 6 in ethylene carbonate:dimethyl carbonate 50:50 (battery grade, Sigma-Aldrich) electrolyte, with a Li metal counter electrode. A typical coin cell has an active mass loading of ~10 mg. Galvanostatic cycle testing was carried out using Maccor Series 4000. The cells and electrodes were prepared and assembled/ disassembled in the glove box under an inert atmosphere and all cycling for the characterization studies was performed using the same conditions. Cells were cycled between 2.0 V and 4.8 V versus Li + /Li at a rate of 100 mA g -1 without voltage holds, rests or formation cycling.", "cleaned_text_preview": "The electrodes were prepared by combining the active material (80 wt%), Super P carbon (10 wt%) and polytetrafluoroethylene binder (10 wt%) using a mortar and pestle. The mixture was then rolled to a thickness of about …", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.093, "bottom": 0.017, "left": 0.128, "right": 0.026 }, "excluded_risk_level": null, "region_id": "p9:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/541", "page": 9, "label": "section_header", "order": 541000, "source_page_order": 8, "layout_order": 545, "layout_page_order": 7, "bbox": [ 39.69, 446.95, 240.37, 8.11 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Inductively coupled plasma optical emission spectroscopy", "text_preview": "Inductively coupled plasma optical emission spectroscopy", "word_count": 6, "cleaned_text": "Inductively coupled plasma optical emission spectroscopy", "cleaned_text_preview": "Inductively coupled plasma optical emission spectroscopy", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body_heading", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.038, "bottom": 0.13, "left": 0.278, "right": 0.125 }, "excluded_risk_level": "low", "region_id": "p9:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/542", "page": 9, "label": "text", "order": 542000, "source_page_order": 9, "layout_order": 546, "layout_page_order": 8, "bbox": [ 39.69, 458.06, 256.71, 61.41 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "The pristine cathode material was dissolved in aqua regia (HCl:HNO3/25:75), before diluting the solution for measurement. A calibration curve was created using standard solutions. Elemental analysis was carried out by ion-coupled plasma optical emission spectroscopy using a PerkinElmer Optima 7300DV ion-coupled plasma optical emission spectroscope.", "text_preview": "The pristine cathode material was dissolved in aqua regia (HCl:HNO3/25:75), before diluting the solution for measurement. A calibration curve was created using standard solutions. Elemental analysis was carried out by i…", "word_count": 45, "cleaned_text": "The pristine cathode material was dissolved in aqua regia (HCl:HNO3/25:75), before diluting the solution for measurement. A calibration curve was created using standard solutions. Elemental analysis was carried out by ion-coupled plasma optical emission spectroscopy using a PerkinElmer Optima 7300DV ion-coupled plasma optical emission spectroscope.", "cleaned_text_preview": "The pristine cathode material was dissolved in aqua regia (HCl:HNO3/25:75), before diluting the solution for measurement. A calibration curve was created using standard solutions. Elemental analysis was carried out by i…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, 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"ADF-STEM", "text_preview": "ADF-STEM", "word_count": 1, "cleaned_text": "ADF-STEM", "cleaned_text_preview": "ADF-STEM", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body_heading", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": true, "edge_dark_ratios": { "top": 0.338, "bottom": 0.0, "left": 0.097, "right": 0.25 }, "excluded_risk_level": "low", "region_id": "p9:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/546", "page": 9, "label": "text", "order": 546000, "source_page_order": 13, "layout_order": 550, "layout_page_order": 12, "bbox": [ 39.69, 587.06, 256.71, 72.16 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "ADF-STEM micrographs were measured using an aberration-corrected JEOL ARM 200F microscope operated at 200 kV. A convergence semi-angle of 22 mrad was used, with a collection semi-angle of 69.6164.8 mrad (ADF). Sets of fast-acquisition multiframe images were taken and corrected for drift and scan distortions using SmartAlign43. To avoid the exposure to air, sample transfer to the STEM microscope was carried out with a vacuum transfer suitcase.", "text_preview": "ADF-STEM micrographs were measured using an aberration-corrected JEOL ARM 200F microscope operated at 200 kV. A convergence semi-angle of 22 mrad was used, with a collection semi-angle of 69.6164.8 mrad (ADF). Sets of f…", "word_count": 67, "cleaned_text": "ADF-STEM micrographs were measured using an aberration-corrected JEOL ARM 200F microscope operated at 200 kV. A convergence semi-angle of 22 mrad was used, with a collection semi-angle of 69.6164.8 mrad (ADF). Sets of fast-acquisition multiframe images were taken and corrected for drift and scan distortions using SmartAlign43. To avoid the exposure to air, sample transfer to the STEM microscope was carried out with a vacuum transfer suitcase.", "cleaned_text_preview": "ADF-STEM micrographs were measured using an aberration-corrected JEOL ARM 200F microscope operated at 200 kV. A convergence semi-angle of 22 mrad was used, with a collection semi-angle of 69.6164.8 mrad (ADF). Sets of f…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.122, "bottom": 0.0, "left": 0.097, "right": 0.014 }, "excluded_risk_level": null, "region_id": "p9:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/547", "page": 9, "label": "section_header", "order": 547000, "source_page_order": 14, "layout_order": 551, "layout_page_order": 13, "bbox": [ 39.69, 672.7, 19.95, 8.11 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "RIXS", "text_preview": "RIXS", "word_count": 1, "cleaned_text": "RIXS", "cleaned_text_preview": "RIXS", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body_heading", "zone": "body_zone", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": true, "edge_dark_ratios": { "top": 0.289, "bottom": 0.117, "left": 0.278, "right": 0.264 }, "excluded_risk_level": "low", "region_id": "p9:body_zone:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/548#prov0", "page": 9, "label": "text", "order": 548000, "source_page_order": 15, "layout_order": 552, "layout_page_order": 14, "bbox": [ 39.69, 683.81, 256.61, 61.41 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "High-resolution RIXS data were collected using the I21 beamline at Diamond Light Source 44 . To produce the data sets for the quantitative analysis, scans at 531.5 eV were recorded at 15 different sample locations and averaged together, with little inhomogeneity in the signal observed (Extended Data Fig. 8). The line scan data from 0.1 eV up to 13.0 eV, excluding the signal from the elastic peak, were z -scored by", "text_preview": "High-resolution RIXS data were collected using the I21 beamline at Diamond Light Source 44 . To produce the data sets for the quantitative analysis, scans at 531.5 eV were recorded at 15 different sample locations and a…", "word_count": 71, "cleaned_text": "High-resolution RIXS data were collected using the I21 beamline at Diamond Light Source 44 . To produce the data sets for the quantitative analysis, scans at 531.5 eV were recorded at 15 different sample locations and averaged together, with little inhomogeneity in the signal observed (Extended Data Fig. 8). The line scan data from 0.1 eV up to 13.0 eV, excluding the signal from the elastic peak, were z -scored by", "cleaned_text_preview": "High-resolution RIXS data were collected using the I21 beamline at Diamond Light Source 44 . To produce the data sets for the quantitative analysis, scans at 531.5 eV were recorded at 15 different sample locations and a…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "body", "zone": "bottom_margin", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.131, "bottom": 0.022, "left": 0.155, "right": 0.024 }, "excluded_risk_level": null, "region_id": "p9:bottom_margin:column_1_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/566", "page": 9, "label": "page_footer", "order": 566000, "source_page_order": 34, "layout_order": 553, "layout_page_order": 15, "bbox": [ 39.69, 763.46, 61.32, 7.0 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Nature Materials", "text_preview": "Nature Materials", "word_count": 2, "cleaned_text": "Nature Materials", "cleaned_text_preview": "Nature Materials", "included_in_body": false, "body_decision_reason": "docling_page_footer", "parser_body_decision_reason": "docling_page_footer", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:0", "role_guess": "page_footer", "zone": "bottom_margin", "column": "column_1_of_2", "column_index": 1, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": true, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 239, 245, 249 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 16, "background_class": "gray", "is_gray_background": true, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.076, "bottom": 0.096, "left": 0.258, "right": 0.182 }, "excluded_risk_level": "low", "region_id": "p9:bottom_margin:column_1_of_2:gray", "truncation_marker": "" }, { "ref": "#/texts/535", "page": 9, "label": "page_header", "order": 535000, "source_page_order": 2, "layout_order": 554, "layout_page_order": 16, "bbox": [ 392.65, 25.82, 167.85, 7.4 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "https://doi.org/10.1038/s41563-024-01833-z", "text_preview": "https://doi.org/10.1038/s41563-024-01833-z", "word_count": 1, "cleaned_text": "", "cleaned_text_preview": "", "included_in_body": false, "body_decision_reason": "docling_page_header", "parser_body_decision_reason": "docling_page_header", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:1", "role_guess": "page_header", "zone": "top_margin", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": true, "page_margin_noise": true, "metadata_line": true, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 238, 244, 249 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 17, "background_class": "gray", "is_gray_background": true, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.145, "bottom": 0.085, "left": 0.167, "right": 0.242 }, "excluded_risk_level": "low", "region_id": "p9:top_margin:column_2_of_2:gray", "truncation_marker": "" }, { "ref": "#/texts/548#prov1", "page": 9, "label": "text", "order": 548001, "source_page_order": 16, "layout_order": 555, "layout_page_order": 17, "bbox": [ 306.14, 49.56, 256.63, 50.66 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "dividing each scan by its standard deviation. Then, the area under the vibrational peak progression (from 0.13 eV to 2.2 eV) was integrated to measure the relative amount of O 2 . The areas for each scan were averaged to create a measure of oxygen intensity, with errors coming from the standard deviation of the mean for each data set.", "text_preview": "dividing each scan by its standard deviation. Then, the area under the vibrational peak progression (from 0.13 eV to 2.2 eV) was integrated to measure the relative amount of O 2 . The areas for each scan were averaged t…", "word_count": 60, "cleaned_text": "dividing each scan by its standard deviation. Then, the area under the vibrational peak progression (from 0.13 eV to 2.2 eV) was integrated to measure the relative amount of O 2 . The areas for each scan were averaged to create a measure of oxygen intensity, with errors coming from the standard deviation of the mean for each data set.", "cleaned_text_preview": "dividing each scan by its standard deviation. Then, the area under the vibrational peak progression (from 0.13 eV to 2.2 eV) was integrated to measure the relative amount of O 2 . The areas for each scan were averaged t…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:1", "role_guess": "body", "zone": "top_margin", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.105, "bottom": 0.072, "left": 0.115, "right": 0.0 }, "excluded_risk_level": null, "region_id": "p9:top_margin:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/549", "page": 9, "label": "section_header", "order": 549000, "source_page_order": 17, "layout_order": 556, "layout_page_order": 18, "bbox": [ 306.14, 112.51, 186.78, 9.3 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "Solid-state 17 O and 6 Li MAS NMR spectroscopy", "text_preview": "Solid-state 17 O and 6 Li MAS NMR spectroscopy", "word_count": 9, "cleaned_text": "Solid-state 17 O and 6 Li MAS NMR spectroscopy", "cleaned_text_preview": "Solid-state 17 O and 6 Li MAS NMR spectroscopy", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:1", "role_guess": "body_heading", "zone": "body_zone", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.035, "bottom": 0.121, "left": 0.143, "right": 0.119 }, "excluded_risk_level": "low", "region_id": "p9:body_zone:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/550", "page": 9, "label": "text", "order": 550000, "source_page_order": 18, "layout_order": 557, "layout_page_order": 19, "bbox": [ 306.14, 123.69, 256.63, 105.53 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "All 6 Li and 17 O MAS ( υ R = 37037 Hz) solid-state NMR were completed at 9.45 T ( υ 0 6 Li = 58.92 MHz, υ 0 17 O = 54.25 MHz) using a Bruker Avance III HD spectrometer and a 1.9 mm double air bearing MAS probe, where υ R is the MAS frequency and υ 0 is the Larmor frequency. All 6 Li and 17 O spectra are referenced to 1 M 6 LiCl (aq) and H 2 17 O, respectively, at 0 ppm. All spectra were recorded using a Hahnecho ( π / 2τ -π -τ ) sequence, where τ is 1/ υ R and π / 2 is 250 kHz; the resultant free induction decay is processed as a half echo. The 6 Li spectra were achieved with a recycle delay of 300 ms. These spectra were completed with relaxation times of 2 ms (fast relaxation) and 100 ms (slow relaxation).", "text_preview": "All 6 Li and 17 O MAS ( υ R = 37037 Hz) solid-state NMR were completed at 9.45 T ( υ 0 6 Li = 58.92 MHz, υ 0 17 O = 54.25 MHz) using a Bruker Avance III HD spectrometer and a 1.9 mm double air bearing MAS probe, where υ…", "word_count": 158, "cleaned_text": "All 6 Li and 17 O MAS ( υ R = 37037 Hz) solid-state NMR were completed at 9.45 T ( υ 0 6 Li = 58.92 MHz, υ 0 17 O = 54.25 MHz) using a Bruker Avance III HD spectrometer and a 1.9 mm double air bearing MAS probe, where υ R is the MAS frequency and υ 0 is the Larmor frequency. All 6 Li and 17 O spectra are referenced to 1 M 6 LiCl (aq) and H 2 17 O, respectively, at 0 ppm. All spectra were recorded using a Hahnecho ( π / 2τ -π -τ ) sequence, where τ is 1/ υ R and π / 2 is 250 kHz; the resultant free induction decay is processed as a half echo. The 6 Li spectra were achieved with a recycle delay of 300 ms. These spectra were completed with relaxation times of 2 ms (fast relaxation) and 100 ms (slow relaxation).", "cleaned_text_preview": "All 6 Li and 17 O MAS ( υ R = 37037 Hz) solid-state NMR were completed at 9.45 T ( υ 0 6 Li = 58.92 MHz, υ 0 17 O = 54.25 MHz) using a Bruker Avance III HD spectrometer and a 1.9 mm double air bearing MAS probe, where υ…", "included_in_body": true, "body_decision_reason": "body", "parser_body_decision_reason": "body", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:1", "role_guess": "body", "zone": "body_zone", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": true, "body_candidate": true, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.041, "bottom": 0.003, "left": 0.115, "right": 0.0 }, "excluded_risk_level": null, "region_id": "p9:body_zone:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/551", "page": 9, "label": "section_header", "order": 551000, "source_page_order": 19, "layout_order": 558, "layout_page_order": 20, "bbox": [ 306.14, 241.51, 65.28, 9.3 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "129 Xe static NMR", "text_preview": "129 Xe static NMR", "word_count": 4, "cleaned_text": "129 Xe static NMR", "cleaned_text_preview": "129 Xe static NMR", "included_in_body": false, "body_decision_reason": "body_heading", "parser_body_decision_reason": "body_heading", "production_usage": "", "visual_asset_type": "", "visual_asset_label": "", "visual_asset_caption_preview": "", "visual_asset_anchor_ref": "", "inside_body_region": true, "body_region_id": "p9:body_region:1", "role_guess": "body_heading", "zone": "body_zone", "column": "column_2_of_2", "column_index": 2, "column_count": 2, "flags": { "docling_non_body_label": false, "page_margin_noise": false, "metadata_line": false, "affiliation_block": false, "reference_item": false, "body_sentence": false, "body_candidate": false, "body_heading": false, "heading_kind": null, "has_front_matter_zone": false, "visual_text": false, "publisher_landing_page": false, "caption_continuation_used_by_asset": false }, "background_rgb": [ 255, 255, 255 ], "page_background_rgb": [ 255, 255, 255 ], "background_delta": 0, "background_class": "white", "is_gray_background": false, "has_frame_evidence": false, "edge_dark_ratios": { "top": 0.075, "bottom": 0.092, "left": 0.143, "right": 0.202 }, "excluded_risk_level": "low", "region_id": "p9:body_zone:column_2_of_2:white", "truncation_marker": "" }, { "ref": "#/texts/552", "page": 9, "label": "text", "order": 552000, "source_page_order": 20, "layout_order": 559, "layout_page_order": 21, "bbox": [ 306.14, 253.81, 256.68, 82.91 ], "page_size": { "width": 595.28, "height": 790.87 }, "text": "A J-Young NMR tube containing the Li-rich NMC cathode, was degassed under dynamic high vacuum using a turbo pump for 48 h and then infilled with natural abundance xenon gas (BOC) at 1 atm of pressure for 48 h. The 129 Xe NMR (298.1 K, 1 atm) spectrum were completed at 9.45 T ( υ 0 = 110.69 MHz) using a 5 mm solution-state NMR probe at a controlled temperature of 298.1 K. A 25 kHz pulse was utilized for all experiments with a recycle delay of 0.5 s. All shifts are referenced to natural abundance Xe (gas, 1 atm and 298.1 K) at 0 ppm.", "text_preview": "A J-Young NMR tube containing the Li-rich NMC cathode, was degassed under dynamic high vacuum using a turbo pump for 48 h and then infilled with natural abundance xenon gas (BOC) at 1 atm of pressure for 48 h. The 129 X…", "word_count": 106, "cleaned_text": "A J-Young NMR tube containing the Li-rich NMC cathode, was degassed under dynamic high vacuum using a turbo pump for 48 h and then infilled with natural abundance xenon gas (BOC) at 1 atm of pressure for 48 h. The 129 Xe NMR (298.1 K, 1 atm) spectrum were completed at 9.45 T ( υ 0 = 110.69 MHz) using a 5 mm solution-state NMR probe at a controlled temperature of 298.1 K. A 25 kHz pulse was utilized for all experiments with a recycle delay of 0.5 s. All shifts are referenced to natural abundance Xe (gas, 1 atm and 298.1 K) at 0 ppm.", "cleaned_text_preview": "A J-Young NMR tube containing the Li-rich NMC cathode, was degassed under dynamic high vacuum using a turbo pump for 48 h and then infilled with natural abundance xenon gas (BOC) at 1 atm of pressure for 48 h. 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Samples were dried via in situ degassing at 70 °C for 5 h before measurement.", "text_preview": "Nitrogen adsorption/desorption analysis was carried using a Micromeritics 3Flex Adsorption Analyser. Samples were dried via in situ degassing at 70 °C for 5 h before measurement.", "word_count": 26, "cleaned_text": "Nitrogen adsorption/desorption analysis was carried using a Micromeritics 3Flex Adsorption Analyser. Samples were dried via in situ degassing at 70 °C for 5 h before measurement.", "cleaned_text_preview": "Nitrogen adsorption/desorption analysis was carried using a Micromeritics 3Flex Adsorption Analyser. 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Source data are available from the corresponding authors upon reasonable request.", "text_preview": "All the data generated or analysed during this study are included within the paper and its Extended Data figures and tables. Source data are available from the corresponding authors upon reasonable request.", "word_count": 32, "cleaned_text": "All the data generated or analysed during this study are included within the paper and its Extended Data figures and tables. Source data are available from the corresponding authors upon reasonable request.", "cleaned_text_preview": "All the data generated or analysed during this study are included within the paper and its Extended Data figures and tables. 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I21: an advanced high-resolution resonant inelastic X-ray scattering beamline at Diamond Light Source. J. Synchrotron Radiat. 29 , 563-580 (2022).", "text_preview": "Zhou, K-J. et al. I21: an advanced high-resolution resonant inelastic X-ray scattering beamline at Diamond Light Source. J. Synchrotron Radiat. 29 , 563-580 (2022).", "word_count": 24, "cleaned_text": "Zhou, K-J. et al. I21: an advanced high-resolution resonant inelastic X-ray scattering beamline at Diamond Light Source. J. Synchrotron Radiat. 29 , 563-580 (2022).", "cleaned_text_preview": "Zhou, K-J. et al. I21: an advanced high-resolution resonant inelastic X-ray scattering beamline at Diamond Light Source. J. 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V., Mudrakovskii, I. L. & Mastikhin, V. M. 129 Xe nuclear magnetic resonance studies of the porous structure of silica gels. J. Chem. Soc. Faraday Trans. 89 , 4239-4243 (1993).", "text_preview": "Terskikh, V. V., Mudrakovskii, I. L. & Mastikhin, V. M. 129 Xe nuclear magnetic resonance studies of the porous structure of silica gels. J. Chem. Soc. Faraday Trans. 89 , 4239-4243 (1993).", "word_count": 32, "cleaned_text": "Terskikh, V. V., Mudrakovskii, I. L. & Mastikhin, V. M. 129 Xe nuclear magnetic resonance studies of the porous structure of silica gels. J. Chem. Soc. Faraday Trans. 89 , 4239-4243 (1993).", "cleaned_text_preview": "Terskikh, V. V., Mudrakovskii, I. L. & Mastikhin, V. M. 129 Xe nuclear magnetic resonance studies of the porous structure of silica gels. J. Chem. Soc. 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R.A.H. acknowledges funding from the Royal Academy of Engineering under the Research Fellowship scheme. We acknowledge Diamond Light Source for time on I21 under proposal MM25785.", "text_preview": "P.G.B. is indebted to the EPSRC, the Henry Royce Institute for Advanced Materials (EP/R00661X/1, EP/S019367/1, EP/R010145/1 and EP/L019469/1) and the Faraday Institution (FIRG016) for financial support. R.A.H. acknowled…", "word_count": 52, "cleaned_text": "P.G.B. is indebted to the EPSRC, the Henry Royce Institute for Advanced Materials (EP/R00661X/1, EP/S019367/1, EP/R010145/1 and EP/L019469/1) and the Faraday Institution (FIRG016) for financial support. R.A.H. acknowledges funding from the Royal Academy of Engineering under the Research Fellowship scheme. 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Li atoms are represented in blue, TM in purple and oxygen in red. b , PXRD data and refinement to the R 3m crystal structure. c , Load curves for Li 1.2 Ni0.13 Co0.13 Mn0.54 O2, cycled between 2.0 V and 4.8 V at 100 mA g -1 for 100 cycles.", "caption_preview": "Fig. 1 | Structural characterization and electrochemical data for Li 1.2 Ni0.13 Co0.13 Mn0.54 O2. a , Li 1.2 Ni0.13 Co0.13 Mn0.54 O2 with a layered R 3m structure, in-plane ordering of Li/Ni and Co/Mn giving rise to the…", "caption_source": "nearby_text_caption", "section": "Redox changes on cycling", "confidence": 0.82, "suppress_in_index": false, "duplicate_of": "", "duplicate_reason": "", "visual_group_id": "", "parent_visual_label": "", "parent_visual_type": "", "region_rescue_reason": "" }, { "asset_index": 2, "element_id": "172ce412-00ce-5967-bdd9-10e446b21f1a", "element_type": "figure", "label": "Fig. 2", "page": 3, "bbox": [ 95.03, 49.21, 410.23, 456.31 ], "caption": "Fig. 2 | Evolution in bulk O-redox activity over 2nd and 100th cycles. a , d , Load curves for the 2nd ( a ) and 100th ( d ) cycles for Li 1.2 Mn0.54 Co0.13 Ni0.13 O2, with the states of charge studied. b , e , RIXS spectra at 531.5 eV collected over the 2nd ( b ) and 100th ( e ) cycles. c , f , Variation in intensity of the molecular O 2 signal in the RIXS spectra over the 2nd ( c ) and 100th ( f ) cycles, as determined by principal component analysis (Methods). Data are presented as mean ± standard deviation with a sample size of 15. P, pristine.", "caption_preview": "Fig. 2 | Evolution in bulk O-redox activity over 2nd and 100th cycles. a , d , Load curves for the 2nd ( a ) and 100th ( d ) cycles for Li 1.2 Mn0.54 Co0.13 Ni0.13 O2, with the states of charge studied. b , e , RIXS spe…", "caption_source": "sequence_or_inferred_caption", "section": "Redox changes on cycling", "confidence": 0.82, "suppress_in_index": false, "duplicate_of": "", "duplicate_reason": "", "visual_group_id": "", "parent_visual_label": "", "parent_visual_type": "", "region_rescue_reason": "" }, { "asset_index": 3, "element_id": "68c9b62c-7fa1-531a-9506-a57f0195b3f3", "element_type": "figure", "label": "Fig. 3", "page": 3, "bbox": [ 347.62, 572.31, 181.51, 123.37 ], "caption": "Fig. 3 | Evolution in amount of trapped O 2 over cycling. Variation in intensity of the molecular O 2 signal from RIXS over cycling in the fully charged (FC) and fully discharged (FD) states. The amount of O 2 formed in the charged materials decreases with cycling and there is increasing evidence of O 2 that is not reduced on discharge. Data are presented as mean ± standard deviation with a sample size of 15.", "caption_preview": "Fig. 3 | Evolution in amount of trapped O 2 over cycling. Variation in intensity of the molecular O 2 signal from RIXS over cycling in the fully charged (FC) and fully discharged (FD) states. The amount of O 2 formed in…", "caption_source": "nearby_text_caption", "section": "Redox changes on cycling", "confidence": 0.82, "suppress_in_index": false, "duplicate_of": "", "duplicate_reason": "", "visual_group_id": "", "parent_visual_label": "", "parent_visual_type": "", "region_rescue_reason": "" }, { "asset_index": 4, "element_id": "9b9c5b64-5c70-5613-adc3-1aa924d3ceba", "element_type": "figure", "label": "Fig. 4", "page": 4, "bbox": [ 84.76, 55.16, 430.21, 324.23 ], "caption": "Fig. 4 | Formation of voids and large diamagnetic Li-rich regions over cycling. a -c , ADF-STEM images showing single grains of the pristine ( a ), 2nd discharge ( b ) and 100th discharge ( c ) material showing the formation of voids about 4-12 nm in diameter over extended cycling. d , 129 Xe NMR experiments. Samples were extracted from cells and infiltrated with Xe gas to probe the open porosity. e , 129 Xe NMR of the pristine, 2nd discharge and 100th discharge materials. The orange region highlighted indicates the presence of open voids of 17 nm diameter and greater after 100 cycles. δ iso , isotropic chemical shift. f , g , 6 Li ( f ) and 17 O ( g ) NMR isolating slow and fast relaxing environments. The sharp peaks at 0 ppm in the 6 Li and slow relaxing 17 O NMR spectra indicate the formation of large diamagnetic Li-rich regions on extended cycling.", "caption_preview": "Fig. 4 | Formation of voids and large diamagnetic Li-rich regions over cycling. a -c , ADF-STEM images showing single grains of the pristine ( a ), 2nd discharge ( b ) and 100th discharge ( c ) material showing the form…", "caption_source": "sequence_or_inferred_caption", "section": "Redox changes on cycling", "confidence": 0.82, "suppress_in_index": false, "duplicate_of": "", "duplicate_reason": "", "visual_group_id": "", "parent_visual_label": "", "parent_visual_type": "", "region_rescue_reason": "" }, { "asset_index": 5, "element_id": "b06d998c-85d5-5c89-a53b-b699542cd9cb", "element_type": "figure", "label": "Fig. 5", "page": 5, "bbox": [ 90.45, 53.92, 422.97, 266.9 ], "caption": "Fig. 5 | Partial reduction of O 2 trapped in voids to form Li-coordinated O 2on the 100th discharge. a , b , 17 O NMR spectra isolating fast ( a ) and slow ( b ) relaxing 17 O environments. The sharp peaks in a are assigned to trapped molecular O2, which decrease in intensity on discharge. There is still evidence of some residual molecular O 2 in the discharged sample, δ cg ( 17 O2) = 2,770 ppm. In b the slow relaxation 17 O is dominated by oxide environments coordinated to paramagnetic TM ions (TM-O 2-), δ cg = 2,100-2,300 ppm. After discharge, a new 17 O environment is formed corresponding to oxide surrounded by Li (that is, Li-O 2) created by the reduction of O 2 in the voids and reinsertion of Li + into the voids coordinated by the O 2, centred at δ cg = 0 ppm. D 1 , relaxation delay. c , Large voids accommodating O2 are partially repopulated by Li + on discharge. Most O 2 is reduced to O 2but some residual O 2 remains.", "caption_preview": "Fig. 5 | Partial reduction of O 2 trapped in voids to form Li-coordinated O 2on the 100th discharge. a , b , 17 O NMR spectra isolating fast ( a ) and slow ( b ) relaxing 17 O environments. The sharp peaks in a are assi…", "caption_source": "sequence_or_inferred_caption", "section": "The contents of the closed voids", "confidence": 0.82, "suppress_in_index": false, "duplicate_of": "", "duplicate_reason": "", "visual_group_id": "", "parent_visual_label": "", "parent_visual_type": "", "region_rescue_reason": "" }, { "asset_index": 6, "element_id": "b2695b09-e616-56a7-839c-c1c0e471b4ec", "element_type": "figure", "label": "Fig. 6", "page": 6, "bbox": [ 90.07, 51.04, 426.68, 451.81 ], "caption": "Fig. 6 | Voltage fade mechanism. a , b , Second cycle: reversible O-redox involves the formation of molecular O 2 trapped in small vacancy clusters throughout the particle. O 2 molecules are fully reduced to O 2on discharge forming small diamagnetic Li-rich regions. c , d , One-hundreth cycle: further TM migration", "caption_preview": "Fig. 6 | Voltage fade mechanism. a , b , Second cycle: reversible O-redox involves the formation of molecular O 2 trapped in small vacancy clusters throughout the particle. 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