A positive electrode sheet, a battery and application
By designing a double-layer active material layer containing P2 and O3 phase layered oxides in the positive electrode of sodium-ion batteries, optimizing element distribution and pore structure, the problems of low-temperature start-up and high DCR of sodium-ion batteries were solved, and high plateau voltage, excellent rate performance and cycle stability were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHUHAI COSMX POWER BATTERY CO LTD
- Filing Date
- 2025-01-17
- Publication Date
- 2026-07-17
AI Technical Summary
Existing sodium-ion battery platforms have low voltage, making it difficult to start vehicles in low-temperature environments. They also have high DCR, low capacity recovery rate after cycling, and poor safety.
The positive electrode design includes a double-layer active material layer containing P2 phase and O3 phase layered oxides. The mass content of Fe, Ni, Na, Mn and Cu is unevenly distributed along the thickness direction of the electrode. The Fe, Ni and Na contents are low and the Mn and Cu contents are high on the side near the current collector surface. A porous structure is set to optimize ion conduction and improve the potential difference.
It improves the battery's platform voltage, enhances low-temperature discharge and cold-start performance, increases rate performance and cycle stability, reduces material costs, and strengthens battery safety.
Smart Images
Figure CN122417784A_ABST