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Proton exchange composite membrane for all vanadium redox flow battery and its preparing method

A proton exchange membrane, flow battery technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of poor vanadium ion barrier ability, unsuitable for wide application, poor chemical stability, etc., and achieve stable physical and chemical properties. , suitable for large-scale production, the effect of low film production cost

Inactive Publication Date: 2006-05-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these films are easily degraded in the electrolyte of pentavalent vanadium and have poor chemical stability.
And Skyllas-Kazacos et al. report that the Nafion membrane produced by U.S. Dupont has shown good chemical stability and proton conductivity [Journal of Applied Electrochemistry, 27 (153) 1996], but there is high production cost and barrier to vanadium ions Problems such as poor ability [The Electrochemical Society, Honolulu, USA, Oct.1998, Proc.Vol.88-11, p363]
Some diaphragms for vanadium batteries developed in recent years have long-term stability, but their prices are still too high to be widely used [SEI Tech.ReV.45(88)1998]

Method used

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  • Proton exchange composite membrane for all vanadium redox flow battery and its preparing method
  • Proton exchange composite membrane for all vanadium redox flow battery and its preparing method

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Experimental program
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Effect test

Embodiment 1

[0021] Dissolve 30 g of polyvinylidene fluoride and 30 g of nano-silica powder in 500 ml of dimethylacetamide solvent. The mixed solution was heated and stirred in a water bath at 60° C. to obtain a viscous solution. This viscous solution was cast on a glass plate and dried at 60°C to form a film, which was dried and rinsed in deionized water. Thereafter, the membrane was immersed in a styrene sulfonic acid solution at 80° C. for 5 hours. Take out the membrane and wash the surface with deionized water to obtain a composite membrane of polyvinylidene fluoride

[0022] Effect: at room temperature, the conductivity is 1.02×10 -2 S / cm.

Embodiment 2

[0024] Dissolve 25 g of polyvinylidene fluoride and 5 g of molecular sieve powder in 100 ml of dimethyl sulfoxide solvent. The mixed solution was heated and stirred in a water bath at 80° C. to obtain a viscous solution. This viscous solution was cast on a glass plate and dried at 150°C to form a film, which was dried and rinsed in deionized water. Thereafter, the membrane was immersed in 2-acrylamide-2-methylpropanesulfonic acid solution at 70° C. for 8 hours. Take out the membrane and wash the surface with deionized water to obtain a composite membrane of polyvinylidene fluoride

[0025] Effect: at room temperature, the conductivity is 2.04×10 -2 S / cm.

Embodiment 3

[0027] Dissolve 30 g of polyvinylidene fluoride and 3 g of nano-alumina powder in 200 ml of propylene carbonate solvent. The mixed solution was heated and stirred in a water bath at 50° C. to obtain a viscous solution. This viscous solution was cast on a glass plate and dried at 120°C to form a film, which was dried and rinsed in deionized water. Thereafter, the membrane was immersed in vinylsulfonic acid solution at 60° C. for 16 hours. Take out the membrane and wash the surface with deionized water to obtain a composite membrane of polyvinylidene fluoride

[0028] Effect: at room temperature, the conductivity is 3.05×10 -2 S / cm.

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Abstract

This invention relates to proton exchange complex film used in vanadium oxidation-reduction battery and its process method, wherein the film uses the inorganic nanometer materials polyvinylidene fluoride as base part and then introduces organic acid with sulfonic acid root through autopolymer to get aim product. The process method to make film with good proton conductivity property and good isolation vanadium ion transparency and chemical stability with simple process and low film cost. The film conducting rate can achieve 10 to 2 S / cm and the vanadium ion transparency rate is as 10 to 7 cm2 / min.

Description

technical field [0001] The invention relates to redox flow battery technology in the field of electrochemistry, in particular to a proton exchange composite membrane for an all-vanadium redox flow battery and a preparation method thereof. Background technique [0002] The all-vanadium redox flow battery is a new type of energy storage battery that uses sulfuric acid solutions of vanadium ions in different valence states as the electrolyte. Proton exchange membrane (diaphragm) is one of the key materials of all-vanadium redox flow battery, and its performance directly affects the performance of the battery. The proton exchange membrane used in the all-vanadium redox flow battery requires strong oxidation resistance, strong acid corrosion resistance, strong proton conductivity, and can effectively prevent the penetration of vanadium ions in different valence states. The currently used battery separator mainly contains cation exchange membranes, such as T.Mohammadi et al. [Jou...

Claims

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Application Information

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IPC IPC(8): C08J5/22H01M8/0297
CPCY02E60/50
Inventor 邱新平罗绚丽沈娟吕正中胡嵩麟武增华朱文涛陈立泉
Owner TSINGHUA UNIV
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