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A side chain type alkyl sulfonated polybenzimidazole ion exchange membrane and its preparation method

A polybenzimidazole, ion exchange membrane technology, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of restricting full-scale commercial application, high price, serious vanadium ion permeability, etc., and achieve low vanadium. Effects of ion permeability, good chemical stability, and high proton conductivity

Active Publication Date: 2020-06-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, commercial flow batteries mainly use Nafion series perfluoroalkane sulfonic acid membranes, but their serious vanadium ion permeability and high price limit the full commercial application of this membrane.

Method used

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  • A side chain type alkyl sulfonated polybenzimidazole ion exchange membrane and its preparation method
  • A side chain type alkyl sulfonated polybenzimidazole ion exchange membrane and its preparation method
  • A side chain type alkyl sulfonated polybenzimidazole ion exchange membrane and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0026] Dehydrogenation of polybenzimidazole: 1 g of polybenzimidazole was dissolved in dimethyl sulfoxide to prepare a solution with a w / v concentration of 2.5%. Under the protection of inert gas, add 0.14g of sodium hydride and react at 40°C for 3h;

[0027] Lactone ring opening: add 0.53g of 1,3-propane sultone to the dehydrogenated reaction system, and react at 40°C for 8h. After the reaction, the reaction product was precipitated in acetone, washed repeatedly, filtered and dried in a vacuum oven at 30° C. for 12 hours to obtain a brown-yellow powder.

[0028] Preparation of the alkylsulfonated polybenzimidazole membrane: the above reaction product was dissolved in dimethyl sulfoxide to prepare a casting solution with a w / v concentration of 4%, and the membrane was degassed by centrifugation. Using the solution casting method, spread the casting solution on a glass plate, place it in an oven at 80°C, and dry it. After the solvent was completely evaporated, the membrane wa...

Embodiment 2

[0031] Dehydrogenation of polybenzimidazole: 1 g of polybenzimidazole was dissolved in dimethylformamide to prepare a solution with a w / v concentration of 2.5%. Under the protection of inert gas, add 0.168g of sodium hydride and react at 30°C for 4h;

[0032] Lactone ring opening: add 0.64g of 1,3-propane sultone to the dehydrogenated reaction system, and react at 40°C for 8h. After the reaction, the reaction product was precipitated in acetone, washed repeatedly, filtered and dried in a vacuum oven at 30° C. for 12 hours to obtain a brown-yellow powder.

[0033] Preparation of the alkylsulfonated polybenzimidazole membrane: the above reaction product was dissolved in dimethyl sulfoxide to prepare a casting solution with a w / v concentration of 4%, and the membrane was degassed by centrifugation. Using the solution casting method, spread the casting solution on a glass plate, place it in an oven at 80°C, and dry it. After the solvent was completely evaporated, the membrane wa...

Embodiment 3

[0036] Dehydrogenation of polybenzimidazole: Dissolve 1g of polybenzimidazole in 50mL of dimethylformamide, add 0.2g of sodium hydride under the protection of inert gas, and react at 30°C for 4h;

[0037] Lactone ring opening: add 0.76g of 1,3-propane sultone to the dehydrogenated reaction system, and react at 50°C for 8h. After the reaction, the reaction product was precipitated in acetone, washed repeatedly, filtered and dried in a vacuum oven at 30° C. for 12 hours to obtain a brown-yellow powder.

[0038] Preparation of the alkylsulfonated polybenzimidazole membrane: the above reaction product was dissolved in dimethyl sulfoxide to prepare a casting solution with a w / v concentration of 4%, and the membrane was degassed by centrifugation. Using the solution casting method, spread the casting solution on a glass plate, place it in an oven at 80°C, and dry it. After the solvent was completely evaporated, the membrane was removed, placed in 1mol / L sulfuric acid solution for 2...

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Abstract

The invention provides a side-chain alkyl sulfonated polybenzimidazole ion exchange film and a preparation method thereof. A preparation method of the side-chain alkyl sulfonated polybenzimidazole ionexchange film comprises the steps of firstly, performing dehydrogenation on -NH site of polybenzimidazole by a dehydrogenation reagent; secondly, performing reaction with sulfoacid ester; and finally, performing protonation to obtain the sulfonated polybenzimidazole ion exchange film. The preparation method has the beneficial effects that the alkyl sulfonated polybenzimidazole ion exchange film has relatively high proton conductivity, relatively low vanadium ion permeability and relatively good chemical stability and has relatively good application prospect in an all-vanadium redox flow battery.

Description

technical field [0001] The invention relates to a method for preparing an alkylsulfonated polybenzimidazole ion exchange membrane, in particular to a method for preparing a polybenzimidazole ion exchange membrane with good chemical stability for an all-vanadium redox flow battery. Background technique [0002] With the development of the world economy and the continuous improvement of people's living standards, the energy consumption continues to increase, and the development of non-polluting renewable energy has gradually become one of the major issues facing mankind. As representatives of renewable and clean energy, solar energy, wind energy and tidal energy are of great strategic significance to effectively develop and utilize them to solve the problems of environmental pollution and energy shortage. However, due to the unstable and discontinuous characteristics of these renewable clean energy sources, which are affected by seasons, time, and locations, the energy storage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/103H01M8/1069C08G73/18
CPCC08G73/18H01M8/103H01M8/1069Y02E60/50
Inventor 焉晓明张彩绵贺高红
Owner DALIAN UNIV OF TECH
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