A lithium-rich manganese-based positive electrode material, a preparation method and application thereof

By designing a three-layer lithium-rich manganese-based cathode material, including a core, a transition layer, and a coating layer, the problem of material interface defects during cycling was solved, improving the electrochemical performance and stability of the battery, making it suitable for industrial production.

CN121054668BActive Publication Date: 2026-06-02GANZHOU JIEXING MATERIAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GANZHOU JIEXING MATERIAL TECHNOLOGY CO LTD
Filing Date
2025-09-02
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Lithium-rich manganese-based cathode materials suffer from poor rate performance and severe capacity and voltage decay during cycling. Furthermore, the structural differences between the coating material and the matrix material can easily cause interface defects, affecting the electrochemical performance of the battery.

Method used

A lithium-rich manganese-based cathode material with a three-layer structure is used, including a core, a transition layer, and a coating layer. The transition layer is Li1+mMn1-mO2 doped with M and N elements, and the coating layer is boron-doped LiMO2 and LiaNbOc. The material is prepared by lithiation sintering and ball milling to form a multi-level heterojunction structure, which reduces interface defects and improves lithium-ion transport speed and conductivity.

Benefits of technology

It significantly improves the electrochemical performance of the battery, extends the battery's lifespan, reduces interfacial impedance, enhances the structural stability of the material and the lithium-ion diffusion rate, and is suitable for industrial and commercial production.

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Abstract

The application belongs to the field of battery materials, and discloses a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The lithium-rich manganese-based positive electrode material comprises a core, a transition layer and a coating layer. The transition layer is coated on at least part of the surface of the core, and the coating layer is coated on at least part of the surface of the particle formed by the core and the transition layer. The transition layer and the coating layer not only can isolate the electrolyte and improve the interface stability, but also can promote the transmission of lithium ions due to the heterojunction structure formed thereby. The transition layer is a lithium-rich material doped with M elements and N elements, which connects the coating layer and the core, reduces the possibility of interface defects between the coating layer and the core, and the doped M elements and N elements can promote the transmission of lithium ions from the outer layer into the doped lithium-rich layer, thereby improving the conductivity and ion diffusion rate of the positive electrode material. The inner layer is a pure-phase lithium-rich material, which is homologous to the intermediate layer. While maintaining high capacity, lithium ions can still be quickly embedded into the inner layer from the intermediate layer.
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Citation Information

Patent Citations

  • Lithium ion battery composite positive electrode material, and preparation method and application thereof

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  • Precursor of lithium-rich manganese-based positive electrode material as well as preparation method and application of precursor

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