一种高电压锂离子电池
By using a specific ratio of fluorinated cyclic carbonates, unsaturated hydrocarbon phosphate compounds, boron-containing lithium salt additives, trinitrile compounds, and cyclic carboxylic anhydrides in high-voltage lithium-ion batteries, a stable interfacial film is formed, solving the problems of gas generation and insufficient cycle life at high temperatures, and achieving battery stability and long-term reliability at high voltages.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN CAPCHEM TECH CO LTD
- Filing Date
- 2023-04-12
- Publication Date
- 2026-07-17
AI Technical Summary
Existing high-voltage lithium-ion batteries suffer from gas generation at high temperatures and insufficient cycle life, which severely degrades battery performance and lifespan, especially in electric vehicle applications.
A non-aqueous electrolyte containing fluorinated cyclic carbonates, phosphate compounds with unsaturated hydrocarbon groups, and boron-containing lithium salt additives is used. Trinitronic compounds and cyclic carboxylic anhydrides are combined as second additives to adjust their proportion and liquid retention coefficient in the non-aqueous electrolyte, forming a dense and stable interfacial film that inhibits the dissolution of the positive electrode active material and the decomposition of the electrolyte.
It effectively improves the cycle life of lithium-ion batteries, suppresses gas generation at high temperatures, ensures the stability and performance of batteries at high voltages, and meets the long-term reliability requirements of electric vehicles for batteries.
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