A lithium-rich manganese-based cathode material modified with sulfur-vacancy molybdenum disulfide and its preparation method

Abstract

This invention discloses a lithium-rich manganese-based cathode material modified with sulfur-vacancy molybdenum disulfide and its preparation method, relating to the field of lithium-ion battery cathode material technology. The preparation method includes: (1) preparing a lithium-rich manganese-based cathode material; (2) reacting a transition metal sulfide with hydrogen peroxide to obtain a defect-rich two-dimensional material; (3) mixing the defect-rich two-dimensional material with the lithium-rich manganese-based cathode material and sintering at a certain temperature to obtain the lithium-rich manganese-based cathode material modified with sulfur-vacancy molybdenum disulfide. This invention constructs an interface protective layer that combines physical barrier and chemical activity by coating the surface of the lithium-rich manganese-based cathode material with molybdenum disulfide nanosheets rich in sulfur vacancies. This design can effectively suppress interfacial side reactions and lattice oxygen evolution, and optimize charge distribution and ion transport by utilizing sulfur vacancies. This synergistic effect of surface coating and defect engineering significantly improves the first-cycle coulombic efficiency, rate performance, and cycle stability of the material.

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