Lithium-sulfur battery electrolyte suitable for low temperature working conditions
By using an electrolyte containing 2,2,2-trifluoroethyl-3,3,3-trifluoropropyl diselenyl ether in lithium-sulfur batteries, the problem of poor performance of lithium-sulfur batteries at low temperatures has been solved, achieving high energy density and long cycle life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TSINGHUA UNIVERSITY
- Filing Date
- 2024-02-08
- Publication Date
- 2026-07-24
AI Technical Summary
Lithium-sulfur batteries exhibit poor charge-discharge performance at low temperatures, including reduced discharge specific capacity and actual energy density, low capacity retention, and short cycle life, which affects their practical applications.
An electrolyte containing 2,2,2-trifluoroethyl-3,3,3-trifluoropropyl diselenyl ether, combined with appropriate amounts of lithium salt and lithium nitrate additives, is used to promote uniform deposition and extraction of lithium metal by suppressing side reactions between lithium metal and the electrolyte, and to enhance reaction kinetics by undergoing a reversible sulfur-selenium exchange reaction with polysulfides.
To improve the energy density and extend the cycle life of lithium-sulfur batteries under low-temperature conditions, the energy density of lithium-sulfur batteries in the first cycle at 0°C is 350-400 Wh/kg, and the number of stable cycles with 80% cycle capacity retention is 50-100.
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