Nickel-rich layered positive electrode material, preparation method thereof and solid-state battery
Through the coordinated coordination of the nickel content gradient and the nitrogen-doped carbon coating, the structural instability problem of nickel-rich layered NCM positive electrode material under high temperature and high voltage is solved, and high stability and excellent electrochemical performance are achieved.
Patent Information
- Application Number
- CN202411913161.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-03-28
AI Technical Summary
The existing nickel-rich layered NCM positive electrode materials have unstable structures under high temperature and high voltage, resulting in the formation of nickel oxides and oxygen release, reducing rate performance, and side reactions with solid electrolytes, resulting in reduced capacity and deterioration of structure.
The structural stability and electrochemical properties of the cathode material are improved by reducing the gradient of the nickel content from the core to the shell and the coordinated cooperation of the nitrogen-doped carbon cladding. The carbon cladding enhances electron and ion conductivity, avoids direct contact between the active material and the electrolyte, and promotes the carbon layer to be firmly anchored on the surface of the nickel-rich matrix material.
The high stability of the positive electrode material during the circulation process is achieved, the magnification and circulation performance are improved, the cycle life is extended, and the overall performance of the solid-state battery is enhanced.