A sulfonated polyether ether ketone / polyaniline composite membrane, a preparation method and application thereof

By preparing sulfonated polyether ether ketone/polyaniline composite membranes, the problem of high vanadium ion permeability in Nafion membranes was solved by utilizing acid-base reactions and hydrogen bonding networks to enhance interfacial bonding. This resulted in improved proton conductivity and reduced vanadium ion permeability, thereby enhancing the electrochemical performance and stability of all-vanadium redox flow batteries.

CN120109215BActive Publication Date: 2026-01-16BEIHANG UNIV
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Patent Information

Application Number
CN202510270192.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-07
Publication Date
2026-01-16
Estimated Expiration
2045-03-07

AI Technical Summary

Technical Problem

In existing vanadium redox flow batteries, Nafion series membranes suffer from high vanadium ion permeability and high cost, making it difficult to improve proton conductivity while reducing vanadium ion permeability.

Method used

The composite of sulfonated polyether ether ketone and polyaniline is used. The amino groups in polyaniline and the sulfonic acid groups in the sulfonated polyether ether ketone matrix form an acid-base reaction. Combined with sulfonated molybdenum disulfide, which provides proton transport sites, a strong acid-base electrostatic interaction and hydrogen bond network are formed, which enhances the interfacial binding force and accelerates proton conduction.

Benefits of technology

It significantly improves the proton conductivity of the composite membrane, reduces vanadium ion permeability, enhances the electrochemical performance and mechanical stability of the all-vanadium redox flow battery, simplifies the preparation process, and facilitates large-scale production.

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Abstract

The application belongs to the technical field of all-vanadium redox flow battery separators, and specifically discloses a sulfonated polyether ether ketone / polyaniline composite membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing polyether ether ketone with concentrated sulfuric acid, heating and reacting in a water bath, and preparing sulfonated polyether ether ketone solids; mixing molybdenum disulfide with toluene, ultrasonicating, adding 1,3-propanesultone, and heating in an oil bath to prepare sulfonated molybdenum disulfide powder; mixing the sulfonated molybdenum disulfide powder, polyaniline and a DMF solution, stirring and ultrasonicating, adding sulfonated polyether ether ketone solids, stirring to obtain casting membrane slurry, coating on a glass plate, drying into a film, sequentially immersing in a sulfuric acid solution and deionized water, and obtaining the sulfonated polyether ether ketone / polyaniline composite membrane. The application discloses a sulfonated polyether ether ketone / polyaniline composite membrane as well as a preparation method and application thereof. The sulfonated polyether ether ketone / polyaniline composite membrane has high proton conductivity, can maintain a low vanadium ion permeability, and improves the electrochemical performance of an all-vanadium redox flow battery.
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