Carbon-coated lithium-rich manganese-based positive electrode material, preparation method thereof and lithium battery
By using low-temperature and high-temperature sintering of unsaturated fatty acid solution with lithium-rich manganese-based cathode material, a dense carbon coating layer and spinel layer are formed, which solves the problem that the existing carbon coating technology does not provide significant improvement and achieves an improvement in the electrochemical performance of the material.
CN122136271APending Publication Date: 2026-06-02SHANDONG CHUANGNENG NEW MATERIALS CO LTD +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANDONG CHUANGNENG NEW MATERIALS CO LTD
- Filing Date
- 2026-03-19
- Publication Date
- 2026-06-02
AI Technical Summary
Technical Problem
Existing carbon coating technology does not significantly improve the ionic conductivity and rate performance of layered lithium-rich manganese-based cathode materials, resulting in poor electrochemical performance.
Method used
An unsaturated fatty acid solution is mixed with lithium-rich manganese-based cathode material, evaporated to dryness, and then sintered at low and high temperatures in an inert atmosphere to form a dense carbon coating layer and spinel layer, thereby improving the electrical conductivity and structural stability of the material.
Benefits of technology
It significantly improves the electrochemical performance, cycle stability, and initial coulombic efficiency of the cathode material, and enhances rate performance and cycle life.
✦ Generated by Eureka AI based on patent content.
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Abstract
This invention provides a carbon-coated lithium-rich manganese-based cathode material, its preparation method, and a lithium battery, belonging to the field of cathode material technology. This invention utilizes an unsaturated fatty acid solution mixed with a lithium-rich manganese-based cathode material and then evaporated to dryness. During the evaporation process, the unsaturated fatty acid adapts to and coats the lithium-rich manganese-based cathode material. Furthermore, the carbon chains of the unsaturated fatty acid can directly coat the surface of the lithium-rich manganese-based cathode material particles. Therefore, using unsaturated fatty acid as a carbon source can form a uniform and dense coating layer on the surface of the lithium-rich manganese-based cathode material. The mixed powder is sintered in an inert atmosphere to carbonize the unsaturated fatty acid coating layer. The reduction effect of carbon induces atomic rearrangement on the surface of the lithium-rich manganese-based cathode material, sequentially forming a dense spinel layer and a dense carbon coating layer on the surface of the lithium-rich manganese-based cathode material, thereby significantly improving the electrochemical performance of the carbon-coated lithium-rich manganese-based cathode material.
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