Modified lithium-rich manganese-based positive electrode material and preparation method and application thereof

By using vacuum impregnation and sintering technology with halide grain boundary modifiers in lithium-rich manganese-based cathode materials, the problems of material structural instability and interfacial side reactions were solved, resulting in higher cycle life and ion transport efficiency.

CN122436470APending Publication Date: 2026-07-21GEM WUXI ENERGY MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GEM WUXI ENERGY MATERIAL CO LTD
Filing Date
2026-05-27
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing lithium-rich manganese-based cathode materials are structurally unstable during deep delithiation, leading to voltage decay and rapid capacity loss, severe interfacial side reactions, inability to effectively suppress electrolyte penetration and transition metal dissolution, and poor cycle performance.

Method used

Halides with the general chemical formula A2MX4 are used as grain boundary modifiers. Through vacuum impregnation and sintering technology, the modifiers penetrate deep into the material and form chemical bonds with the matrix, constructing continuous ion channels and neutralizing HF, thereby enhancing the interfacial bonding force.

Benefits of technology

It significantly improves the structural integrity and cycle life of the material, reduces interfacial impedance, optimizes ion transport kinetics, and improves rate performance and first coulombic efficiency.

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Abstract

The application provides a modified lithium-rich manganese-based positive electrode material and a preparation method and application thereof, and the preparation method of the modified lithium-rich manganese-based positive electrode material comprises the following steps: S1, mixing a grain boundary modifier and a solvent to obtain a modifier solution; S2, vacuum impregnating a lithium-rich manganese-based matrix in the modifier solution, drying and sintering to obtain the modified lithium-rich manganese-based positive electrode material. The preparation method of the modified lithium-rich manganese-based positive electrode material provided by the application effectively inhibits the contact loss and micro-crack expansion caused by volume change in the cycle process by constructing a chemically bonded interface and mechanically reinforcing the internal grain boundary, thereby greatly improving the structural integrity and cycle life of the material; meanwhile, the modifier which penetrates into the grain boundary not only forms a physical barrier to block the electrolyte penetration channel, but also in-situ neutralizes the invading HF, significantly reduces the interface side reaction and transition metal dissolution, and improves the rate performance of the material.
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