一种用于锂离子二次电池的正极复合材料、正极和电池
By introducing sodium or potassium oxides as additives into the positive electrode composite material of lithium-ion secondary batteries, the problem of SEI film damage caused by the expansion of the negative electrode material is solved by using large ions to expand the negative electrode material, thereby improving the cell life and safety performance while maintaining high energy density.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2022-01-14
- Publication Date
- 2026-07-17
AI Technical Summary
During the charging and discharging process of lithium-ion secondary batteries, the negative electrode material continuously expands/contracts due to the insertion and extraction of lithium ions, which leads to the damage of the SEI film, increases the cell expansion force, and affects the cell life and safety performance.
Introducing sodium or potassium oxides, sulfides, peroxides, azides, and carbon oxides into the positive electrode composite material as positive electrode additives utilizes the larger ionic radii of Na ions and/or K ions to expand the negative electrode material, reducing the expansion/contraction deformation of the negative electrode material, reducing side reactions, and improving safety performance.
It effectively reduces or eliminates the expansion/contraction deformation of the negative electrode material, reduces the cell expansion force, improves cell life and enhances safety performance, while maintaining high energy density.
Smart Images
Figure CN117355953B_ABST