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Composite diaphragm used for asymmetric cell

A composite diaphragm and asymmetric technology, which is applied in the direction of regenerative fuel cells and fuel cell components, etc., can solve the problems of low proton conductivity, poor vanadium resistance, complex process, etc., and achieve low penetration, low raw material cost, The effect of convenient operation

Inactive Publication Date: 2016-08-03
HENAN NORMAL UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, break through the shackles of the traditional ion exchange membrane, provide a novel asymmetric composite diaphragm suitable for vanadium batteries, and solve the proton conductivity of the proton exchange membrane existing in the prior art. Low, poor stability, poor vanadium resistance, complex process, expensive and other issues

Method used

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Embodiment

[0024] The thickness of the SPEEK / PP / FCB composite membrane obtained by the present invention is 240 microns (considering factors such as diaphragm cost, stability, and mechanical properties), and in this composite diaphragm, the thickness of FCB is 80 microns (considering diaphragm cost and stability) ), the thickness of the PP diaphragm is 150 microns, and the thickness of the SPEEK diaphragm is 70 microns (considering the stability of the diaphragm and the surface resistance), a part of the FCB diaphragm and the SPEEK diaphragm penetrate into the PP diaphragm to form a middle cross-mixed layer; the PP diaphragm As a reinforced film, the interfaces in the composite diaphragm are in good contact, and there is no separation of layers. The obtained composite diaphragm is uniform in appearance, transparent and compact, and has good mechanical properties.

[0025] 1. Preparation of SPEEK solution: Add 16.0 g of polyether ether ketone that has been vacuum-dried at 80°C for 6 hours ...

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Abstract

The invention relates to the field of a diaphragm of an all-vanadium redox flow battery, and concretely relates to an asymmetric SPEEK / PP / FCB composite diaphragm suitable for the all-vanadium redox flow battery, and thereby, the problems of poor stability of a proton exchange membrane, poor conductivity of proton, poor vanadium resistance, and high cost in the prior art are solved. The composite diaphragm breaks through a traditional proton exchange membrane concept, the prepared composite diaphragm has good proton conductivity, vanadium resistance, mechanical properties, chemical stability, and good VRB battery performance, and provides a novel approach for commercialized preparation of the diaphragm of the all-vanadium redox flow battery.

Description

technical field [0001] The invention relates to the field of diaphragms used in all-vanadium redox flow batteries (VRFB), in particular to a composite diaphragm for asymmetric batteries. Background technique [0002] Vanadium battery is the most feasible battery technology for large-scale energy storage supporting new clean energy (wind energy, solar power generation, etc.), and the diaphragm material is one of the key materials that restricts the commercial development of vanadium batteries. A good separator material should have good proton conductivity, mechanical properties, chemical stability, low vanadium ion permeability, etc. At present, there are basically no separators that meet this condition. [0003] At this stage, the diaphragm materials mainly used in domestic and foreign demonstration projects are Nafion series membranes from DuPont Company of the United States. However, Nafion has poor vanadium resistance performance, serious battery self-discharge phenomenon...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M8/18
CPCY02E60/50
Inventor 耿振铎王玉平常晓晓耿占吉张毅
Owner HENAN NORMAL UNIV
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