改性正极材料及其制备方法、正极和锂离子电池
By using a three-layer gradient coating structure, the problem of insufficient cycle stability and rate performance of ternary high-nickel cathode materials under high and low temperature environments is solved, and residual lithium removal and ion-electron conduction are optimized, thereby improving the overall performance of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN LISHEN BATTERY CO LTD
- Filing Date
- 2025-09-28
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing technology, the ternary high-nickel cathode material has insufficient cycle stability and rate performance under high and low temperature environments, and the problems of residual lithium on the surface, poor rate performance and insufficient thermal stability have not been effectively solved.
The material employs a three-layer gradient coating structure, including a core layer of Ni90-96 ternary cathode material, an inner layer of lithium phosphate, a middle layer of lithium phosphate graphene composite layer with dispersed nanoparticles, and an outer layer of fluoride. The lithium phosphate layer is generated through an in-situ reaction of dilute phosphoric acid, and graphene is added to the surface of the lithium phosphate layer to form a micro-network, introducing a spinel nanophase. The outer fluoride layer provides F-rich protection.
It achieves the removal of residual lithium, optimizes ion and electron conduction, improves the cycle performance and high-temperature stability of the material, and significantly improves the overall performance of the battery.
Smart Images
Figure CN121355216B_ABST