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.

CN118054079BActive Publication Date: 2026-07-24TSINGHUA UNIVERSITY
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Patent Information

Application Number
CN202410177965.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-02-08
Publication Date
2026-07-24
Estimated Expiration
2044-02-08

AI Technical Summary

Technical Problem

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.

Method used

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.

Benefits of technology

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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Abstract

The application discloses a lithium-sulfur battery electrolyte suitable for low-temperature working conditions. The lithium-sulfur battery electrolyte comprises an organic solvent, a lithium salt, lithium nitrate additives and an additive, and the additive is 2,2,2-trifluoroethyl-3,3,3-trifluoropropyl diselenide. The electrolyte solves the problem that the charge-discharge performance of the electrolyte applied to the lithium-sulfur battery is poor in a low-temperature environment, improves the energy density of the lithium-sulfur soft package battery and prolongs the cycle life of the lithium-sulfur soft package battery. The preparation method and the lithium-sulfur battery also have the beneficial effects.
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Citation Information

Patent Citations

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