Enhancing the Electrochemical Performance of Li2-xMnO3 via Dual Strategies: Using MOF-Derived Manganese Oxide Precursor and Tuning Li Content

Cathode materials play a crucial role in determining the electrochemical properties and fabrication cost of Lithium-ion batteries (LIBs). Li 2 MnO 3 has garnered increasing attentions due to its high theoretical capacity, but it suffers from severe issues, such as structural deterioration and irreversible capacity loss. In this paper, we propose a novel strategy to synthesize Li 2-x MnO 3 cathodes using MOF-derived manganese oxide via a simple solid-state reaction. When used as cathodes for LIBs, the MOF-Li 2 MnO 3 exhibits a high reversible capacity of 92.5 mAh g −1 after 120 cycles at 25 mA g −1 , as compared to pristine Li 2 MnO 3 (31.7 mAh g −1 ). Additionally, hybrid phases including orthorhombic-LiMnO 2 and cubic LiMn 2 O 4 are introduced into Li-deficient materials, which exhibit different electrochemical behaviors from MOF-Li 2 MnO 3 . The MOF-Li 1.75 MnO 3 delivers an unprecedented capacity of 151.9 mAh g −1 after 120 cycles at 25 mA g −1 . Overall, the synergistic effect of adopting MOF-derived precursor and inducing multiphase by tuning Li content is conducive to enhancing the electrochemical performance of Li 2 MnO 3 cathode.