A high-acid-preservation polybenzimidazole composite proton exchange membrane for liquid flow battery and a preparation method thereof

By introducing sulfonated and quaternized nanofillers into the polybenzimidazole membrane, the problems of low proton conductivity and unstable acid doping were solved, improving the overall performance and stability of the flow battery and making it suitable for large-scale production.

CN122455855APending Publication Date: 2026-07-24江苏深储新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
江苏深储新材料有限公司
Filing Date
2026-05-12
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing flow batteries, polybenzimidazole membranes have low proton conductivity and unstable acid doping, which leads to continuous performance degradation and limits their commercial application.

Method used

A physical blending process was used to uniformly disperse sulfonated and quaternized nanofillers in a polybenzimidazole matrix. Acid doping activation treatment was then applied to construct efficient proton conduction channels and chemically stabilize the acid radicals, thereby improving the mechanical and chemical stability of the membrane.

Benefits of technology

It achieves high proton conductivity and high acid retention capacity, improves the overall performance of the membrane, is suitable for large-scale production, and reduces operation and maintenance costs.

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Abstract

The application belongs to the technical field of electrochemical energy storage, and relates to a high-acid-retention polybenzimidazole composite proton exchange membrane for a flow battery and a preparation method thereof. The composite membrane takes polybenzimidazole as a matrix, and sulfonated nanofillers and quaternized nanofillers are uniformly dispersed in the matrix; and the high-acid-retention polybenzimidazole composite proton exchange membrane is obtained through acid doping and activation treatment. The composite membrane realizes the dual functions of high proton conduction sites and high acid retention, and the two functions cooperatively construct a nanostructure for efficient proton transmission and acid locking in the membrane, thereby improving the efficiency and cycle life of the flow battery. The application has simple process, is easy to industrialize, and has mild and controllable process conditions, and provides a feasible solution for solving the problem of acid loss of the PBI membrane.
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