一种核壳结构型钠离子电池正极材料及制备方法
By employing a core-shell structure design in the cathode material of sodium-ion batteries and utilizing surface pre-oxidation treatment to form an oxide buffer layer, the problem of uneven stress distribution caused by inconsistent volume changes was solved, improving the cycle stability of the material and the sodium ion conduction efficiency, thus achieving high specific capacity and good cycle performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 安徽得壹能源科技有限公司
- Filing Date
- 2023-03-28
- Publication Date
- 2026-07-17
AI Technical Summary
In existing layered transition metal oxide sodium-ion battery cathode materials, uneven stress distribution caused by inconsistent volume changes during cycling leads to microcracks, affecting sodium ion conduction and causing electrochemical performance degradation.
The core-shell structure design is adopted. The core precursor particles are generated by co-precipitation under a protective atmosphere. Then, the surface is pre-oxidized to form an oxide layer. The shell is generated by co-precipitation under an air atmosphere. The core-shell structure precursor is formed and then high-temperature solid-state sintering is performed to form an oxide buffer layer between the core and the shell.
It improves the cycle stability and sodium ion transport rate of the cathode material in sodium-ion batteries, enhances specific capacity and rate performance, and has a simple process, low cost, and is easy to mass-produce.
Smart Images
Figure CN116344731B_ABST