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Anion exchange membrane of imidazolium covalently modified fluorine-containing resin and preparation method of anion exchange membrane

A technology of anion exchange membrane and fluorine-containing resin, applied in the field of ion exchange membrane, can solve the problem of lack of anion exchange membrane, and achieve the effects of low price, reducing the degree of monomer self-polymerization, and low vanadium permeability

Pending Publication Date: 2022-04-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the prior art still lacks an anion exchange membrane with high conductivity for all-vanadium redox flow batteries

Method used

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  • Anion exchange membrane of imidazolium covalently modified fluorine-containing resin and preparation method of anion exchange membrane
  • Anion exchange membrane of imidazolium covalently modified fluorine-containing resin and preparation method of anion exchange membrane
  • Anion exchange membrane of imidazolium covalently modified fluorine-containing resin and preparation method of anion exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0035] An all-vanadium redox flow battery uses imidazolium to covalently modify the polyvinylidene fluoride anion exchange membrane, which is prepared by the following method:

[0036] (1) Put 10g of polyvinylidene fluoride powder into a polyethylene bag and lay it flat, vacuumize and seal it and place it on a trolley covered with dry ice for pre-irradiation with electron beams, the absorbed dose is 140kGy, and then put the irradiated The polyvinylidene fluoride powder was stored in dry ice.

[0037] (2) Add 30g of 1-vinyl-3-ethylimidazolium tetrafluoroborate, 3g of Tween 20 and 67g of deionized water into a 250ml three-neck flask, stir for 30 minutes under a nitrogen atmosphere, then quickly pour into the irradiated The finished powder was stirred and reacted at 60°C for 6 hours, and the obtained product was filtered and washed repeatedly with deionized water and ethanol to remove unreacted modified monomers, and then dried for later use.

[0038](3) Weigh 2 g of dry powder,...

Embodiment 2

[0040] Weigh 2g of dry powder, dissolve in 18g of N-methylpyrrolidone, stir and dissolve at 60°C for 24 hours to form a casting solution with a mass fraction of 10%. After standing still for 6 hours to remove air bubbles, place it upside down on a clean horizontal glass plate. After standing still for 5-10 minutes, place it in an oven at 60°C to dry and remove N-methylpyrrolidone, and soak the diaphragm in 1M sulfuric acid solution 24 hours to obtain a PVDF diaphragm.

Embodiment 3

[0042] The same method as in Example 1, but the difference is that the absorbed dose is 40 kGy, and the grafting rate GY is only about 10%, which has limited improvement in performance.

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Abstract

The invention belongs to the field of ion exchange membranes, and particularly relates to an anion exchange membrane of imidazolium covalently modified fluorine-containing resin and a preparation method of the anion exchange membrane. The method comprises the following steps: (1) irradiating fluorine-containing resin powder by using an ionizing radiation technology to obtain activated resin; (2) the activated resin and a monomer with an anion exchange function are subjected to a graft polymerization reaction, graft-modified fluorine-containing resin powder is obtained, and the monomer with the anion exchange function contains imidazolium; and (3) preparing the graft-modified fluorine-containing resin powder into the diaphragm material through a solution membrane casting method. According to the invention, a pre-radiation grafting technology is utilized to avoid the generation of a large amount of polyion liquid and a crosslinking body thereof in the irradiation process, so that imidazolium is fixed on a fluorine-containing resin molecular chain, and is uniformly distributed on a diaphragm through a solution membrane casting method to realize the conduction of sulfate radicals or hydrogen sulfate radicals in the electrolyte of the all-vanadium redox flow battery; and the vanadium resistance is improved.

Description

technical field [0001] The invention belongs to the field of ion-exchange membranes, and in particular relates to an anion-exchange membrane covalently modified with imidazolium fluororesin and a preparation method thereof. Background technique [0002] As the most promising technology in flow batteries, all-vanadium flow batteries are still hindered in their current development, mainly due to the high cost caused by limited vanadium resources and expensive battery materials. Therefore, cost reduction is the key point for the expansion and development of all-vanadium redox flow batteries. As a key component of an all-vanadium redox flow battery, the properties of the ion exchange membrane affect the performance and cost of the battery system. A cheap, durable, high conductivity and low vanadium permeation ion exchange membrane can greatly improve the performance of the battery and reduce the cost of the battery, thereby greatly promoting the marketization of the all-vanadiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0202H01M8/0221
Inventor 赵龙王志国
Owner HUAZHONG UNIV OF SCI & TECH
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