Coating liquid for composite lithium ion battery separator, composite lithium ion battery separator, and method for preparing the same

By using solvent systems such as hexamethylphosphoramide and tetramethylurea, combined with lithium chloride or calcium chloride co-solubilizing salts, a composite lithium-ion battery separator suitable for industrial production was prepared, solving the problems of insufficient dissolution capacity and difficult solvent recovery, and realizing stable and low-cost separator production.

CN122370641APending Publication Date: 2026-07-10ZHEJIANG FANGTUO NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG FANGTUO NEW MATERIAL TECHNOLOGY CO LTD
Filing Date
2026-06-05
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies are difficult to stably mass-produce para-aramid composite lithium-ion battery separators. The solvent system is limited, the dissolving capacity is insufficient, and the solvent recovery is difficult, resulting in high production costs and making it unsuitable for industrial applications.

Method used

A coating solution containing poly(p-phenylene terephthalamide) was prepared by using hexamethylphosphoramide and/or tetramethylurea as organic solvents and lithium chloride or calcium chloride as co-solvents. Ceramic powder and polymer binder were added, and a composite lithium-ion battery separator was prepared by a continuous process.

Benefits of technology

Stable large-scale production of para-aramid composite lithium-ion battery separators has been achieved, reducing production costs, improving solvent recovery and utilization rates, and ensuring the stability of the production process and the performance of the separators.

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Abstract

This invention relates to a coating solution for composite lithium-ion battery separators, a composite lithium-ion battery separator, and a method for preparing the same. The coating solution for composite lithium-ion battery separators comprises: (A) poly(p-phenylene terephthalamide); (B) an organic solvent, which is at least one selected from hexamethylphosphoramide and tetramethylurea; (C) a co-solubilizing salt, which is at least one selected from lithium chloride and calcium chloride; and (D) an additive, which is at least one selected from ceramic powder and polymer binder. The coating solution for composite lithium-ion battery separators exhibits good stability. The composite lithium-ion battery separator possesses good air permeability, heat resistance, and good compatibility with the electrolyte, making it suitable for lithium-ion batteries. The preparation methods for both the coating solution and the composite lithium-ion battery separator are simple, convenient, and have low production costs.
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