Secondary battery, battery module, battery pack, and electric device
By subjecting the lithium manganese phosphate cathode material to specific element doping and two-layer coating treatment, combined with non-aqueous electrolyte additives, the problems of poor rate capability and cycle performance of lithium manganese phosphate secondary batteries have been solved, achieving efficient lithium-ion migration and improved battery performance.
CN117425976BActive Publication Date: 2026-06-02CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2022-04-01
- Publication Date
- 2026-06-02
Smart Images
Figure CN117425976B_ABST
Abstract
The application provides a secondary battery, a battery module, a battery pack and a power utilization device. The secondary battery comprises a positive electrode sheet and a nonaqueous electrolyte, the positive electrode active material comprises a core and a shell covering the core, the core comprises Li 1+x Mn 1‑y A y P 1‑z R z O4, the shell comprises a first coating layer covering the core and a second coating layer covering the first coating layer, the first coating layer comprises pyrophosphate MP2O7 and phosphate XPO4, and the second coating layer comprises carbon; the nonaqueous electrolyte comprises a first additive, and the first additive comprises one or more of a compound shown in formula 1, a compound shown in formula 2 and a compound shown in formula 3. The rate performance, cycle performance and high-temperature stability of the lithium manganese phosphate secondary battery are improved.
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