A composite semi-solid electrolyte membrane having a carbon-carbon double bond structure and a preparation method thereof

By introducing carbon-carbon double bond structures and inorganic fluoride particles into the polymer matrix, combined with a reinforcing fiber network, the problems of insufficient ionic conductivity, mechanical strength and thermal stability of semi-solid electrolytes are solved, thereby improving the overall performance of lithium-ion batteries.

CN122455897APending Publication Date: 2026-07-24QINYANG CHUANGNENG (YANGZHOU) NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINYANG CHUANGNENG (YANGZHOU) NEW MATERIALS CO LTD
Filing Date
2026-04-23
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing semi-solid electrolytes face problems such as insufficient ionic conductivity of the polymer matrix, weak mechanical strength, and poor thermal stability. Furthermore, the introduction of liquid components often further deteriorates the mechanical properties, leading to a decrease in the ability to suppress lithium dendrites and easy leakage or combustion at high temperatures.

Method used

Carbon-carbon double bond structures are formed by treating the polymer matrix with metal hydroxide solution, and inorganic fluoride particles are generated in situ. These particles are combined with reinforcing fibers to form a three-dimensional network skeleton. Lithium salts or fast ion conductors are added as additives to improve ionic conductivity, mechanical strength and thermal stability.

Benefits of technology

It achieves high ionic conductivity, excellent mechanical strength and good thermal stability, improving the safety and performance of lithium-ion batteries and meeting the application requirements of high-performance lithium-ion batteries.

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Abstract

The disclosure provides a composite semi-solid electrolyte membrane with carbon-carbon double bond structure and a preparation method, the composite semi-solid electrolyte membrane comprises: a modified polymer matrix, which is obtained by treating polyvinylidene fluoride or its copolymer with a metal hydroxide solution, the treatment forms a carbon-carbon double bond structure on the polymer backbone, and in-situ generates and uniformly disperses inorganic fluoride particles in the modified polymer matrix; reinforcing fibers, which are dispersed in the modified polymer matrix and interweave to form a three-dimensional network skeleton; and additives, which are dispersed in the modified polymer matrix and used to provide lithium ion carriers for the lithium ion battery. The disclosure realizes the synergistic improvement of the ion conductivity, mechanical strength and thermal stability of the composite semi-solid electrolyte membrane by generating carbon-carbon double bond structure and inorganic fluoride through chemical modification and combining with the fiber reinforcement technology, and exhibits good application prospect in the semi-solid lithium ion battery.
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