Modified high-nickel positive electrode material, preparation method and application thereof
By introducing a discontinuous oxide pinning phase into the high-nickel cathode material and utilizing multi-source co-precipitation and lithium-free pre-sintering processes, the structural instability of the high-nickel cathode material during high-temperature sintering and electrochemical cycling was solved, thereby improving the material's long lifespan and high-rate performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CENT SOUTH UNIV
- Filing Date
- 2026-03-31
- Publication Date
- 2026-07-17
AI Technical Summary
High-nickel cathode materials deteriorate rapidly during high-temperature sintering and electrochemical cycling due to structural instability and phase structure evolution and interfacial side reactions caused by lithium ion insertion/extraction. Existing modification strategies are insufficient to effectively suppress internal grain boundary evolution and microcrack initiation.
Hydroxide precursors containing pinning elements were prepared by a multi-source co-precipitation method. Discontinuous oxide pinning phases were formed in a high-nickel cathode material matrix through a lithium-free pre-sintering process. Pinning elements such as W, Ce, Sn, Ta, Nb and Y were used to construct nanoscale grain boundary structures, providing physical anchoring and spatial constraints, and inhibiting grain boundary migration and grain growth.
It significantly improves the structural stability and lithium-ion transport performance of high-nickel cathode materials, extends cycle life, and maintains excellent rate performance, solving the problem of difficulty in achieving both stability and kinetics in traditional modification strategies.
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Figure CN122417872A_ABST