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      "text": "Keywords: Li2MnO3 Metal-organic framework Oxygen vacancy Lithium-ion battery Electrochemical activity",
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      "text": "Despite the dazzling theoretical capacity, the devasting electrochemical activity of Li2MnO3 (LMO) caused by the difficult oxidation of Mn 4+ impedes its practical application as the lithium-ion battery (LIB) cathode. The efficacious activation of the Li2MnO3 by importing electrochemically active Mn 3+ ions or morphological engineering is instrumental to its lithium storage activity and structural integrity upon cycling. Herein, we propose a conceptual strategy with metal-organic frameworks (MOFs) as selfsacrificial templates to prepare oxygen-deficient Li2MnO3 (Ov-LMO) for exalted lithium storage performance. Attributed to optimized morphological features, LMO materials derived from Mn-BDC (H2BDC = 1,4-dicarboxybenzene) delivered superior cycling/rate performances compared with their counterparts derived from Mn-BTC (H3BTC = 1,3,5-benzenetricarboxylicacid) and Mn-PTC (H4PTC = pyromellitic acid). Both experimental and theoretical studies elucidate the efficacious activation of primitive LMO materials toward advanced lithium storage by importing oxygen deficiencies. Impressively, Ov-LMO derived from Mn-BDC (Ov-BDC-LMO) delivered intriguing reversible capacities (179.2 mA h g \u0000 1 at 20 mA g \u0000 1 after 200 cycles and 100.1 mA h g \u0000 1 at 80 mA g \u0000 1 after 300 cycles), which can be attributed to the small particle size that shortens pathways for Li + /electron transport, the enhanced redox activity induced by abundant oxygen vacancies, and the optimized electronic configuration that contributes to the faster lithium diffusivity. This work provides insights into the rational design of LMO by morphological and atomic modulation to direct its activation and practical application as an advanced LIB cathode.",
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      "text": "Ó 2023 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.",
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