In-situ polymerization solid electrolyte, preparation method and application thereof, and lithium metal battery

By using sodium thiosulfate and fluoroethylene carbonate to prepare an in-situ polymerized solid electrolyte, the problems of polymer degradation and side reactions caused by traditional initiator residues are solved, the electrochemical window is broadened, and the interfacial stability and cycle stability of lithium metal batteries are improved, making it suitable for the large-scale production of lithium metal batteries.

CN122091735AActive Publication Date: 2026-05-26GUANGDONG UNIV OF TECH
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Patent Information

Application Number
CN202610557020.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-24
Publication Date
2026-05-26
Estimated Expiration
2046-04-24

AI Technical Summary

Technical Problem

Existing polymer solid electrolytes suffer from problems such as initiator residues catalyzing polymer degradation and participating in side reactions, and have a narrow oxidation stability window, making them difficult to match with high-voltage cathodes. As a result, lithium metal batteries have insufficient cycle stability and safety.

Method used

Sodium thiosulfate was used as the ring-opening polymerization initiator for 1,3-dioxolane and 1,1,1-trifluoro-2,3-epoxypropane. The active center was generated by the ring-opening polymerization under heating conditions to form a polyether skeleton and introduce fluorinated side chains. Combined with fluoroethylene carbonate plasticizer, an in-situ polymerized solid electrolyte was prepared to achieve close contact with the electrode and avoid impurity phases and side reactions.

Benefits of technology

It improves the electrolyte's antioxidant capacity and electrochemical window, enhances interface stability, inhibits lithium dendrite growth, improves the cycle stability and safety of lithium metal batteries, simplifies the preparation process, and reduces production costs.

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Abstract

The invention relates to the technical field of electrochemical energy storage materials and lithium metal batteries, in particular to an in-situ polymerization solid electrolyte, a preparation method and application thereof and a lithium metal battery, the in-situ polymerization solid electrolyte is prepared by taking 1, 3-dioxolame and 1, 1, 1-trifluoro-2, 3-epoxypropane as reaction monomers, sodium thiosulfate as an initiator and sodium hydroxide as an initiator through a one-step polymerization method, and the in-situ polymerization solid electrolyte is prepared through a one-step polymerization method. And adding a lithium salt and a plasticizer fluoroethylene carbonate, mixing to obtain a precursor solution, and carrying out heating ring-opening polymerization reaction. The electrolyte has a large number of amorphous regions, is beneficial to ion transmission, can form a self-supporting compact structure, is in close contact with an electrode, has a pure interface, effectively reduces interface impedance, and can avoid side reaction of an electrode interface. The oxidation resistance is improved, an electrochemical window is widened, and dendritic crystal growth is inhibited. And the cycling stability and the safety performance of the battery are improved while good mechanical performance is realized. And the material has a good application prospect in lithium metal batteries, lithium ion batteries, solid-state energy storage systems or flexible electronic equipment.
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