Solid-state electrolyte filler, preparation method of solid-state electrolyte, and solid-state battery

By preparing an optimized solid electrolyte filler mixed with polyethylene oxide and lithium bis(trifluoromethanesulfonyl)imide to form a LiF-LiCl SEI layer, the problems of low ionic conductivity and high interfacial impedance caused by the fluorinated SEI layer are solved, thus improving the stability and lifespan of lithium metal batteries.

CN120749189BActive Publication Date: 2026-05-29XIANGTAN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIANGTAN UNIV
Filing Date
2025-07-04
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing polymer solid electrolytes, the high degree of fluorination of the fluorinated SEI layer leads to low ionic conductivity and high interfacial impedance, which limits the application of lithium metal batteries under high temperature or high load conditions. Furthermore, the instability of the fluorinated SEI affects the long-term stability and performance of the battery.

Method used

A first solid electrolyte filler (DG-Cl) was prepared by reacting 1,3-diaminoguanidine hydrochloride with nitrosalicylic acid, and a second solid electrolyte filler (DG-F) was prepared by treating it with saturated sodium fluoride solution. This second solid electrolyte filler was then mixed with polyethylene oxide and lithium bis(trifluoromethanesulfonyl)imide to prepare a solid electrolyte with an optimized structure, forming the SEI layer of LiF-LiCl.

Benefits of technology

It increases the overpotential for lithium deposition nucleation, enhances lithium cycle stability and battery cycle life, reduces the formation of lithium dendrites, and improves the performance and stability of the battery under high temperature or high load.

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Abstract

The application provides a solid-state electrolyte filler, a preparation method of a solid-state electrolyte and a solid-state battery, and relates to the technical field of batteries. The first solid-state electrolyte filler can be compounded with polyethylene oxide to prepare a solid-state electrolyte, after anion separation, the vacancy of cation anchors TFSI ‑ , the charge is transferred to TFSI ‑ , the breaking of C-F bond is promoted, lithium fluoride is formed, the chlorine ion contained in the filler can be combined with lithium ion to form lithium chloride, then the SEI of the composite phase LiF-LiCl is generated, the SEI layer generated by the solid-state electrolyte with a higher content of lithium fluoride at the same temperature has a lower lithium deposition nucleation overpotential, a higher lithium cycle stability and a longer lithium metal full battery cycle life.
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