Lithium secondary battery
By using a lithium nickel-cobalt-manganese-based positive electrode active material and a silicon-based negative electrode active material with a high nickel content in lithium secondary batteries, and using a high concentration of specific lithium salts in a non-aqueous electrolyte solution, the performance deterioration of lithium secondary batteries when combining high nickel and silicon-based materials is solved, and excellent electrochemical characteristics, stability and life characteristics are achieved.
Patent Information
- Application Number
- CN202510232885.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2018-05-11
- Filing Date
- 2019-05-10
- Publication Date
- 2025-04-11
AI Technical Summary
When the existing lithium secondary batteries combine the positive electrode active material with a high nickel content and the silicon-based negative electrode active material, there are problems such as sharp deterioration of battery performance, structural instability and negative electrode deterioration.
A high nickel content of lithium nickel cobalt manganese-based positive electrode active material and silicon-based negative electrode active material were used, and a high concentration of LiPF6 and bis(fluorosulfonyl)imide lithium were used in the non-aqueous electrolyte solution to form a stable SEI film to inhibit the dissolution of metal ions and the expansion of the negative electrode.
The excellent electrochemical characteristics, stability and life characteristics of lithium secondary batteries are achieved, while the capacity characteristics and thermal stability are improved, and the structural instability of high-nickel electrodes is reduced.