Fluorine sulfonyl imide salt, preparation method thereof, electrolyte and secondary battery
By using fluorosulfonyl imide salt to form a CEI film in lithium manganese iron phosphate batteries, the problems of manganese ion dissolution and low conductivity are solved, and the cycle and high-temperature performance of the batteries are improved.
CN122301142APending Publication Date: 2026-06-30ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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Patent Information
- Application Number
- CN202610554895.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-24
- Publication Date
- 2026-06-30
AI Technical Summary
Technical Problem
Existing lithium manganese iron phosphate cathode materials suffer from manganese ion dissolution and the Jahn-Teller effect during cycling, which affect cycling performance. Furthermore, their poor conductivity and thermal stability result in suboptimal electrochemical performance.
Method used
Fluorosulfonamide salt is used as an electrolyte additive to form a dense CEI film, which inhibits manganese ion dissolution and reduces electrolyte decomposition, thereby improving battery cycle life and high-temperature stability.
Benefits of technology
It effectively inhibits CEI film rupture, reduces metal ion catalytic side reactions, improves battery cycle performance and high-temperature stability, and enhances battery safety.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a fluorosulfonyl imide salt, a preparation method thereof, an electrolyte and a secondary battery. The structural formula of the fluorosulfonyl imide salt is shown as a formula I, R is selected from O or S, M is selected from Li, Na, K, Cs and Mg, and m * n is equal to 4. The fluorosulfonyl imide salt can form a layer of compact CEI film rich in organic sulfur compounds, CEI rupture caused by volume change in the circulation process can be inhibited, and metal ions in the electrolyte can be reduced, so that continuous decomposition of the electrolyte and lithium loss are reduced. The CEI film can still keep good stability under the high-temperature condition, and the interface impedance at the high temperature is reduced. The fluorosulfonyl imide salt can be used as an electrolyte additive with excellent performance, and is especially suitable for a secondary battery made of a lithium iron manganese phosphate material. Formula I
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