Quasi-solid-state electrolyte, method for producing the same, battery, and electric device

A quasi-solid electrolyte with low impedance and high ionic conductivity was prepared by in-situ polymerization of electrolyte salt and carbonate solvent. This solved the safety problems of liquid electrolytes and the interfacial contact problems of solid electrolytes, and realized a high-performance and low-cost battery electrolyte.

CN120319878BActive Publication Date: 2026-05-29NATIONAL INSTITUTE OF GUANGDONG ADVANCED ENERGY STORAGE CO LTD
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Patent Information

Application Number
CN202510520822.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-04-23
Publication Date
2026-05-29
Estimated Expiration
2045-04-23

AI Technical Summary

Technical Problem

Existing liquid electrolytes pose risks of leakage and flammability, while solid electrolytes have poor contact with the electrode interface, leading to increased interfacial impedance, which affects the battery's electrical cycle performance and lifespan, and are also costly.

Method used

Quasi-solid electrolytes are prepared by mixing electrolyte salts with carbonate solvents, adding diluents and initiators, and carrying out in-situ polymerization to form a locally high-concentration solvation structure, thereby achieving rapid ion conduction and stable interfacial film formation.

Benefits of technology

A quasi-solid-state electrolyte with low impedance, high ionic conductivity, excellent high-rate performance, and excellent safety performance was prepared, reducing interfacial impedance, improving battery charge-discharge performance and cycle stability, and having the advantage of low economic cost.

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Abstract

The application discloses a kind of quasi-solid electrolyte and preparation method thereof, battery, electrical device, electrolyte salt is mixed with carbonate solvent, and preparation base electrolyte solution;Diluent and initiator are added to base electrolyte solution and are reacted, and quasi-solid electrolyte is prepared;The diluent includes ring-opening polymerizable cyclic monomer diluent, and the mass ratio of the diluent, the initiator and the base electrolyte solution is (30-70) : (0.1-0.5) : (30-70) in turn.The precursor solution containing local high concentration solvation structure is formed in the preparation process of quasi-solid electrolyte of the application, and quasi-solid electrolyte with low impedance, high ionic conductivity, excellent high rate performance and good safety performance is prepared using in-situ polymerization technology.The quasi-solid electrolyte prepared by the application is assembled into battery, with excellent charge-discharge performance, excellent cycle stability under high rate conditions, and low economic cost and high practicality.
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