Cyclodextrin-based porous membrane, preparation method thereof and application of cyclodextrin-based porous membrane in alkaline zinc-iron flow battery

By introducing crosslinking agent or α-CD functionalized MWCNT into the alkaline zinc-iron flow battery separator, the cyclodextrin-based porous membrane was prepared, which solved the problem of high puncture and swelling of zinc dendrites, achieved the stability of the separator and the continuity of ion transport channels, and improved the battery performance and cycle life.

CN120459803APending Publication Date: 2025-08-12NANJING TECH UNIV
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Patent Information

Application Number
CN202510352554.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-24
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

In existing alkaline zinc-iron flow batteries, zinc dendrites pierce the diaphragm and cause the battery to be short-circuited. The ordinary modification method cannot effectively solve it. The blended film is prone to swelling after the introduction of α-CD and affects the stability of the ion transport channel.

Method used

By adding crosslinking agent to the cast film liquid or functionalizing MWCNTs with α-CD, a cyclodextrin-based porous membrane was prepared, and the swelling rate was reduced and the stability of the ion transport channel was improved by chemical crosslinking reaction. The modified material combining α-CD and MWCNT was fully dispersed in the SPEEK matrix.

Benefits of technology

The swelling rate of the separator is reduced, the stability and mechanical properties of the ion transmission channel are improved, the battery performance and circulation stability of the alkaline zinc-iron flow battery are improved, and the growth of zinc dendrites is inhibited.

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Abstract

The invention discloses a cyclodextrin-based porous membrane as well as a preparation method and application thereof in an alkaline zinc-iron flow battery, and the preparation method of the porous membrane comprises the following steps: adding alpha-CD and a cross-linking agent into a sulfonated polyetheretherketone solution, or adding alpha-CD functionalized MWCNT into the sulfonated polyetheretherketone solution to obtain a membrane casting solution, and then preparing the membrane. By adding a cross-linking agent or performing alpha-CD functionalization on the MWCNT, the swelling rate of the membrane is reduced, and stability regulation and control of an ion transmission channel are realized.
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