Proton exchange membrane, preparation method thereof and fuel cell

Abstract

The invention discloses a preparation method of a proton exchange membrane, and the method comprises the following steps: adding an initiator into a mixed solution of binary olefin amine, vinyl sulfonate and a water solvent at the reaction temperature of 65-80 DEG C under the nitrogen condition to initiate free radical polymerization reaction of the binary olefin amine and the vinyl sulfonate to obtain a linear prepolymer solution; then mixing the linear prepolymer solution with a perfluorinated sulfonic acid resin dispersion liquid and mixed polyol according to a preset proportion for reaction to obtain polymer slurry; and finally, coating the polymer slurry to form a membrane, and drying and curing the membrane formed by coating to obtain the proton exchange membrane with a cross-linked interpenetrating network structure. According to the preparation method, a high-stability cross-linked polymer network is taken as a framework, an interpenetrating network is realized with perfluorosulfonic acid polymer molecules, the swelling degree of the proton exchange membrane is inhibited macroscopically and microcosmically, and the invention also discloses the proton exchange membrane prepared by the preparation method and a fuel cell comprising the proton exchange membrane.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a proton exchange membrane, a preparation method thereof and a fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an important branch of the field of fuel cells. Proton exchange membrane (PEM) is one of the core components of proton exchange membrane fuel cells. The anode hydrogen fuel and cathode oxide in a membrane fuel cell act as a barrier. [0003] During the start-up-stop process of the proton exchange membrane fuel cell, the proton exchange membrane is in the change of dry-wet-dry and low temperature-high temperature-low temperature, that is, the proton exchange membrane is under the environment change of dry-wet cycle and cold-heat cycle for a long time , resulting in repeated swelling-shrinking deformation of the proton exchange membrane. Since the proton exchange membrane is a polymer polyelectrolyte, the proton exchange membrane...

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Problems solved by technology

However, this method cannot suppress the swelling degree of the proton exchange membrane microscopically. In addition, since the above-mentioned added microporous reinforcement layer is a planar structure, the swelling effect cannot be controlled in the direction of proton penetration, so the proton exchange in the direction of proton penetration Membrane swelling tends to be too high

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