A kind of non-fluorine amphoteric composite film for iron-chromium redox flow battery and its preparation method
A liquid flow battery and composite membrane technology, which is applied in fuel cells, circuits, electrical components, etc., can solve the problems of low active ion permeability, high active ion permeability, and high price, and achieve low permeability and anti-activity Good ionic performance and the effect of reducing the cost of the diaphragm
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[0035] In the specific implementation process, the preparation method of the non-fluorine amphoteric composite membrane for the iron-chromium redox flow battery of the present invention includes the following steps and process conditions:
[0036] (1) dissolving a certain amount of sulfonated polymer resin in a certain amount of high-boiling point organic solvent, heating and dissolving in a reaction kettle, and preparing a sulfonated polymer resin solution with a mass percentage of 3 to 30%;
[0037] (2) Ultrasonic treatment of the sulfonated polymer resin solution obtained in step (1) to remove air bubbles and impurities;
[0038] (3) Disperse a certain amount of polyaniline in a certain amount of solvent, stir magnetically for 4 hours, ultrasonically disperse for 2 hours, mix and disperse with mechanical stirring, and prepare a homogeneous solution with a mass percentage of 0.05-10%.
[0039] (4) Mix the solutions in step (2) and step (3), stir for 2 hours, ultrasonically d...
Embodiment 1
[0046] In this example, the preparation method of the non-fluorine amphoteric composite membrane for the iron-chromium redox flow battery is as follows:
[0047] 1. Dry the polyetheretherketone resin under vacuum (-0.1MPa) at 100°C for 12 hours before use.
[0048] 2. Slowly add 250mL of concentrated sulfuric acid into the three-necked flask, plug one mouth with a vacuum glass stopper, and adjust the stirrer to control a certain stirring speed. Then slowly add 15g of dry polyetheretherketone powder into a three-neck beaker, under electric stirring, at a water bath temperature of 50°C, after sulfonation reaction for 12 hours, stop stirring, and let the reactant stand for a while. Then pour the sulfonated product into a separatory funnel, let the obtained product stand for a period of time, and then dry it at 70° C. to obtain sulfonated polyether ether ketone with a sulfonated degree of 60 wt%.
[0049] 3. Dissolve 3.5g of sulfonated polyether ether ketone in 70mL of dimethyl s...
Embodiment 2
[0055] The difference from Example 1 is:
[0056] 1. Dissolve 5g of sulfonated polyether ether ketone in 70mL of dimethyl sulfoxide, stir until dissolved, and the resulting mixed solution is ultrasonically treated for a period of time to remove air bubbles and impurities.
[0057] 2. The remaining steps are the same as in Example 1.
[0058] In this example, the fluorine-free amphoteric composite membrane is a non-fluorine amphoteric composite membrane obtained by blending sulfonated polymer resin and polyaniline resin; The content of the compound film is 2%, and the surface of the composite film is uniform.
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