Positive electrode material, preparation method thereof, positive electrode sheet, sodium ion battery and electric device
By using a composite phase single-crystal layered oxide coating layer with the same composition as the core on the surface of the cathode material, the problems of high residual alkali content and low conductivity on the surface are solved, thereby improving the electrochemical performance and structural stability of sodium-ion batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING EASPRING MATERIAL TECH CO LTD
- Filing Date
- 2026-05-21
- Publication Date
- 2026-07-17
AI Technical Summary
The common problem in existing sodium-ion battery cathode materials is the high residual alkali content on the surface, which affects the electrochemical performance of the battery, and the low conductivity of the coating layer.
The coating layer uses the same composition as the cathode material. The core is an O3 phase single-crystal layered oxide, and the coating layer is a composite phase single-crystal layered oxide. By controlling the composition ratio and thickness, the crystal lattice matching of the core and the coating layer is achieved, the residual alkali on the surface is reduced, and the conductivity and structural stability are improved.
It significantly improves the electrochemical performance of cathode materials, including cycle performance and air stability, reduces the generation of gases such as CO2 and H2, inhibits the dissolution of transition metals and interfacial side reactions, and improves the structural stability of materials and the electrochemical performance of batteries.
Smart Images
Figure CN122417847A_ABST