Mixed matrix type cation exchange membrane and preparation method thereof

Abstract

The invention relates to a mixed matrix type cation exchange membrane and a preparation method thereof. The cation exchange membrane takes a sulfonated modified polymer material as a substrate and isdoped with Schiff base type covalent organic framework materials loaded with different functional groups. The preparation method comprises the following steps of: sequentially performing monomer preparation and polymerization of a covalent organic framework material, sulfonation modification of a polymer, uniform mixing of the covalent organic framework material and a sulfonated polymer, and flow-spreading film formation; and finally, performing acid treatment to obtain the cation exchange membrane. The covalent organic framework material can effectively improve the vanadium resistance of themembrane based on the rigid porous structure; the organic porous structure of the covalent organic framework and the different functional modifications can partially compensate the loss of membrane proton conductivity caused by the introduction of particles; the rigid framework can obviously inhibit the swelling in the membrane and can improve the tensile strength of the membrane; COFs is composedof organic structures and can promote compatibility between sulfonated polymers and covalent organic framework materials; and moreover, the polymer as the substrate can improve the film forming performance of the covalent organic framework material, so that the covalent organic framework material has the better mechanical strength.

Description

technical field

[0001] The invention belongs to the field of battery membrane materials, and relates to a mixed-matrix cationic membrane and a preparation method thereof. Background technique

[0002] With the intensification of environmental pollution, the development of renewable new energy sources such as solar energy, wind energy, and water energy has attracted widespread attention. However, traditional renewable energy power generation devices usually face problems such as the mismatch between power generation peaks and power consumption peaks, and often require large-scale energy storage devices to "shave peaks and fill valleys". As a new type of clean, high-response, long-life, electrolyte-renewable energy storage device, all-vanadium redox flow battery has great application potential in the field of new energy.

[0003] As a key component in the all-vanadium redox flow battery, the ion-exchange membrane plays the role of isolating the negative and positive electrode...

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