A kind of preparation method of all-vanadium redox flow battery diaphragm

An all-vanadium redox flow battery and diaphragm technology, applied in the field of ion exchange membrane, can solve the problems of high vanadium permeability and high price of vanadium redox flow battery diaphragm, achieve good thermal stability, ensure proton conductivity, and be easy to process. Effect

Active Publication Date: 2021-11-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing a diaphragm for an all-vanadium redox flow battery, which uses ethylene-vinyl alcohol copolymer powder as a base material, and contains cation exchange function and anion exchange Functional monomers are irradiated and grafted, and protonated after film formation to obtain an all-vanadium redox flow battery separator, thereby solving the technical problems of the currently used vanadium redox flow battery separators that are expensive and have high vanadium permeability

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  • A kind of preparation method of all-vanadium redox flow battery diaphragm
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  • A kind of preparation method of all-vanadium redox flow battery diaphragm

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preparation example Construction

[0029] A kind of preparation method of all-vanadium redox flow battery separator provided by the present invention comprises the following steps:

[0030] (1) The ethylene-vinyl alcohol copolymer powder is irradiated and grafted with γ-rays or electron beams, and the free radicals generated after the surface of the ethylene-vinyl alcohol copolymer powder is irradiated react with grafting monomers After the reaction is completed, take out the powder after irradiation and grafting, and clean and remove unreacted monomers;

[0031] Wherein, the reaction monomer comprises sodium styrene sulfonate and dimethylaminoethyl methacrylate;

[0032] (2) converting the copolymer powder after irradiation and grafting in step (1) into a membrane material, and then performing a protonation reaction on the membrane material to obtain an all-vanadium redox flow battery diaphragm.

[0033] In some embodiments, the particle size of the ethylene-vinyl alcohol copolymer powder is between 60 mesh a...

Embodiment 1

[0052] A low-cost all-vanadium redox flow battery membrane, i.e., the preparation method of the amphoteric ion exchange membrane is as follows:

[0053] 20g of ethylene-vinyl alcohol copolymer (the content of polyethylene in the ethylene-vinyl alcohol copolymer is 44%) powder is packed into a polyethylene bag and paved, and vacuum-sealed, placed on a dolly equipped with dry ice, passed The pre-irradiation is carried out under the accelerator beam, and the absorbed dose is 120kGy, and then the irradiated ethylene vinyl alcohol copolymer powder is cooled and stored in dry ice for later use.

[0054] In a 500mL three-necked flask, add 11.2g dimethylaminoethyl methacrylate, 48.8g sodium styrene sulfonate and 200g water (the molar ratio of dimethylaminoethyl methacrylate to sodium styrene sulfonate is 0.3:1, single The total body concentration is 30%). Stir well under the protection of nitrogen and raise the temperature to 70°C, add the irradiated ethylene vinyl alcohol copolymer ...

Embodiment 2

[0059] The conductivity test of the ion-exchange membrane that embodiment 1 makes

[0060] Place the amphoteric ion-exchange membrane obtained in Example 1 in 1M sulfuric acid to activate for 6h, dry its surface water with filter paper, sandwich it between two stainless steel electrodes, test its AC impedance curve through an electrochemical workstation, and calculate Its conductivity is 40.01 mS / cm.

[0061] figure 2 It is a graph showing the relationship between the electrical conductivity and the grafting rate of the vanadium redox flow battery diaphragm prepared in the present invention. It can be seen that the electrical conductivity of the diaphragm increases with the increase of the grafting rate. However, when the grafting rate is too high, the grafted powder cannot be dissolved to form a film, so it is necessary to select a powder with a suitable grafting rate to form a film.

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Abstract

The invention belongs to the field of ion exchange membranes of liquid flow batteries, and more specifically relates to a preparation method of a low-cost all-vanadium redox flow battery diaphragm. It uses ethylene-vinyl alcohol copolymer powder as the base material, grafts with monomers containing cation exchange function and anion exchange function by irradiation, and protonates after film formation to obtain an all-vanadium redox flow battery diaphragm, thus solving the current problem The vanadium redox flow battery separator is expensive and has high vanadium permeability technical problems.

Description

technical field [0001] The invention belongs to the field of ion exchange membranes of liquid flow batteries, and more specifically relates to a preparation method of a low-cost all-vanadium redox flow battery diaphragm. Background technique [0002] With the increasingly serious shortage of fossil energy and environmental pollution, vigorously developing clean energy such as solar energy and wind energy has become an important way to solve energy problems. However, due to the limitation of natural conditions, the power generation of solar and wind power changes significantly with day and night, and it is difficult to maintain a continuous and stable power output. Therefore, it is necessary to use a large-scale energy storage system for peak regulation of the power grid. Therefore, the development of high-efficiency, large-scale, and economical energy storage systems has become a core issue in the development of new energy sources such as solar energy and wind energy. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1069H01M8/1072H01M8/1088H01M8/1044H01M8/1048H01M8/18C08F255/02C08F212/14C08F2/46
CPCC08F2/46C08F255/02H01M8/1044H01M8/1048H01M8/1069H01M8/1072H01M8/1088H01M8/188C08F212/14Y02E60/50
Inventor 赵龙谢康俊董珍
Owner HUAZHONG UNIV OF SCI & TECH
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