A positive electrode sheet, a preparation method thereof, a lithium ion battery, and an electric device
By coating the surface of the positive electrode active material particles with a self-terminating hyperbranched polymer and constructing an undercoat between the positive electrode current collector and the active material layer, the safety and high-rate performance issues of lithium-ion batteries under high voltage and high charge state are solved, and the safety and efficient electrochemical reaction of the battery under extreme conditions are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-02-24
- Publication Date
- 2026-06-09
AI Technical Summary
Existing lithium-ion battery cathode systems are prone to electrolyte decomposition and exacerbated interfacial side reactions under high voltage and high charge state, leading to thermal runaway. Furthermore, the cathode current collector is subject to chemical corrosion and interfacial failure, affecting safety and high-rate performance.
A self-terminating hyperbranched polymer is coated on the surface of the positive electrode active material particles, and a base coating with conductivity, corrosion resistance and interface buffering capacity is constructed between the positive electrode current collector and the active material layer. By forming a thermally stable layer under high temperature or mechanical damage, the decomposition of electrolyte and thermal runaway are suppressed, thereby achieving synergistic regulation of the interface.
It significantly reduces the safety risks of lithium-ion batteries under conditions such as puncture, short circuit and extrusion, while maintaining high rate performance and improving battery safety and electrochemical reaction efficiency.
Smart Images
Figure CN122177737A_ABST