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Liquid flow cell composite membrane and application thereof

A liquid flow battery and composite membrane technology, which is applied in the direction of fuel cells, regenerative fuel cells, fuel cell parts, etc., can solve the problems of not obviously increasing the surface resistance of the film, low cost, etc., and achieve the expansion of types and application scope, increase Hydrophilicity and the effect of improving ion selectivity

Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to overcome the problems existing in the existing ion-exchange membranes for flow batteries, and provide a thin-layer organic composite porous membrane for flow batteries, which is prepared by compounding a layer of cation-exchange resin on the surface of the porous membrane. The dense film can greatly improve the ion selective permeability of the porous film without significantly increasing the surface resistance of the film, thereby obtaining an extremely low-cost separator material suitable for flow batteries

Method used

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  • Liquid flow cell composite membrane and application thereof
  • Liquid flow cell composite membrane and application thereof
  • Liquid flow cell composite membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 7.5 g of polyacrylonitrile in 30 ml of DMSO and 10 ml of THF, stir for 5 hours, spread the resulting polymer solution on a glass plate with a thickness of 250 μm, and then quickly immerse it in 5 L of water to solidify to form a porous diaphragm.

[0035] The prepared porous diaphragm was treated in 10wt.% sodium hydroxide aqueous solution for 55 minutes at a treatment temperature of 55°C. Then the membrane was cleaned with deionized water, soaked in ethanol for 2 hours, and the water in it was replaced.

[0036] A DMAC solution of Nafion resin with a concentration of 2wt.% was prepared and coated on the surface of the porous membrane with a spin coater. Rotate at high speed until the coating solution is dry to prepare a composite porous membrane (A)

[0037] The all-vanadium redox flow battery is assembled by using the prepared composite membrane, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the effective are...

Embodiment 2

[0042] Same as Example 1, the polymer is replaced by polysulfone, and other conditions remain unchanged.

Embodiment 3

[0044] Same as Example 1, the polymer is replaced by polyimide, the solvent is replaced by NMP, and other conditions remain unchanged.

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Abstract

The invention relates to a liquid flow cell composite membrane and application thereof in liquid flow cells, a pore membrane prepared from raw materials of one or two or more kinds of organic polymer resin is used as a matrix, one side surface of the matrix is composited with a dense membrane prepared from cation exchange resin, and the composite membrane is simple in preparation method and environmental friendly in process. Compared with the original pore membrane, the composite membrane has higher hydrophily and ionic selectivity, and can effectively inhibit the electrolyte solution migration problem, and the type and use scope of the liquid flow cell pore membrane material can be expanded.

Description

technical field [0001] The invention relates to a polymer electrolyte diaphragm material for a flow battery, in particular to a composite membrane for a flow battery and its application in a flow battery. Background technique [0002] Liquid flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, large storage capacity, free site selection, deep discharge, safety and environmental protection, and low maintenance costs. It can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. Vanadium flow battery (VFB) is considered to be the most promising and representative of flow batteries due to its advantages of high safety, good stability, high efficiency, long life (life > 15 years), and low cost. A liquid flow ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/18C08J7/04H01M8/0202H01M8/023H01M8/0239H01M8/0245
CPCC08J7/042H01M8/0239H01M8/18Y02E60/50
Inventor 段寅琦张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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