Perfluorosilane electrolyte solvents, methods of making and using the same

By optimizing the electrode/electrolyte interface with perfluorosilane electrolyte solvent, LiF-rich SEI and CEI are generated, solving the problems of lithium dendrite growth and electrolyte depletion, and achieving improved long cycle life and safety performance of lithium metal batteries.

CN122118093APending Publication Date: 2026-05-29HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI GUOXUAN HIGH TECH POWER ENERGY
Filing Date
2026-02-10
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Lithium metal batteries suffer from capacity loss and safety hazards due to excessive lithium dendrite growth during use. Existing electrolytes exhibit severe side reactions with lithium metal, resulting in an unstable SEI film. Ether-based electrolytes are prone to decomposition under high pressure, leading to electrolyte depletion.

Method used

By using perfluorosilane electrolyte solvent and adjusting the number of fluorine atoms on the side chains, LiF-rich SEI and CEI are generated, optimizing the electrode/electrolyte interface and improving the solvent's oxidation stability and lithium-ion transport efficiency.

Benefits of technology

It suppresses lithium dendrite growth, improves the cycle life and safety performance of lithium metal batteries, enables long-cycle and high-rate discharge, and enhances the stability of the electrode/electrolyte interface.

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Abstract

The application discloses a perfluorosilane electrolyte solvent and a preparation method and application thereof, relates to the technical field of electrolyte solvents for batteries, and specifically discloses the perfluorosilane electrolyte solvent, wherein the electrolyte ion conductivity of the perfluorosilane electrolyte solvent meets 6.3 ms / cm-7.6 ms / cm, and the lithium battery impedance assembled by the electrolyte meets ≤5.7 mΩ; the ion conductivity of the electrolyte added with the perfluorosilane electrolyte solvent in the application is kept in the above range, long cycle and large rate discharge of the lithium metal battery can be realized, the conductivity of the silane solvent with higher fluorine content is the lowest, but the higher the fluorine content of the solvent itself and the weak solvation effect generated, the fluorine content of the electrode / electrolyte interface is improved, the SEI and CEI rich in LiF are generated, the more fluorosilane solvent replaced by the fluorine element has the most excellent interface performance, and then the impedance value of the battery composed of the fluorosilane solvent is kept at the above lower level.
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