Preparation method of composite bipolar plate for all-vanadium redox flow battery

An all-vanadium redox flow battery, bipolar plate technology, applied in fuel cell parts, fuel cells, regenerative fuel cells, etc., can solve the problems of reduced battery performance, poor reversibility, easy to etch, etc., to reduce the resistivity. , Low processing cost, the effect of increasing strength

Inactive Publication Date: 2017-08-11
周翔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that metal electrodes are too expensive, have poor reversibility, and are prone to passivation after long-term use, reducing battery performance; while conductive plastic electrodes have high resistivity; carbon electrodes are relatively cheap, high in reliability, and cost less to use and maintain. It is relatively low, but it is easy to etch under high current density for a long time, so the battery performance is restricted. How to obtain electrodes with good stability, low resistivity, good electrochemical activity and low cost has become the research and development of vanadium battery system. key aspects

Method used

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  • Preparation method of composite bipolar plate for all-vanadium redox flow battery
  • Preparation method of composite bipolar plate for all-vanadium redox flow battery

Examples

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Embodiment 1

[0031] A composite bipolar plate for an all-vanadium redox flow battery, prepared by the following method:

[0032] (1) The polyethylene modified plastic and 1mm foamed nickel are configured according to a certain weight ratio of 70%: 30%, and the polyethylene modified plastic is made into a 2mm flat plate, which is placed between the upper and lower layers of foamed nickel;

[0033] (2) Pass the polyethylene modified plastic plate sandwiched between the two layers of nickel foam obtained in step (1) through the double rollers heated to 130°C at a speed of 3m / h to obtain a composite conductive plastic plate;

[0034] (3) Put the 3mm graphite felt for vanadium battery in 70% concentrated sulfuric acid for 8 hours, wash it with deionized water, put it in a muffle furnace, bake it at 180°C for 6 hours, and take it out for use ;

[0035] (4) Place the polyethylene-modified plastic composite board in a custom-made fixture, then place two pieces of 3mm graphite felt and polyethylen...

Embodiment 2

[0037] A composite bipolar plate for an all-vanadium redox flow battery, prepared by the following method:

[0038] (1) Configure the polycarbonate modified plastic and 1mm graphite felt according to a certain weight ratio of 80%: 20%, and make the polycarbonate modified plastic into a 2mm flat plate, and place it between the upper and lower layers of graphite felt between;

[0039] (2) Pass the polycarbonate modified plastic plate sandwiched between the two layers of graphite felt obtained in step (1) through double rollers heated to 150°C at a speed of 5m / h to obtain a composite conductive plastic plate;

[0040] (3) Treat 8mm graphite felt for vanadium batteries in 98% concentrated sulfuric acid for 4 hours, wash it with deionized water, put it in a muffle furnace, bake it at 240°C for 5 hours, and take it out for use ;

[0041] (4) Place the polycarbonate modified plastic composite board in a custom-made fixture, then place two pieces of 8mm graphite felt and polycarbona...

Embodiment 3

[0043] A composite bipolar plate for an all-vanadium redox flow battery, prepared by the following method:

[0044] (1) The polyaniline modified plastic and 1mm carbon fiber paper are configured according to a certain weight ratio of 90%:10%, and the polyaniline modified plastic is made into a 2mm flat plate, which is placed between the upper and lower layers of carbon fiber paper;

[0045] (2) Pass the polyaniline modified plastic plate sandwiched between the two layers of carbon fiber paper obtained in step (1) through double rollers heated to 180°C at a speed of 10m / h to obtain a composite conductive plastic plate;

[0046] (3) Put a 6mm graphite felt for vanadium battery in 80% concentrated sulfuric acid for 6 hours, wash it with deionized water, put it in a muffle furnace, bake it at 300°C for 4 hours, and take it out for use ;

[0047] (4) Place the polyaniline-modified plastic composite board in a custom-made fixture, then place two pieces of 6mm graphite felt and poly...

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Abstract

The invention relates to the technical field of redox flow batteries, in particular to a preparation method of a composite bipolar plate for an all-vanadium redox flow battery. The preparation method comprises the steps of arranging upper and lower porous structure carbon/metal substrates, clamping a high-molecular polymer material in the middle, performing pressing by heated double rollers to form a composite conductive plastic plate, and then performing hot pressing on the two sides of a composite plate obtained by bonding graphite felt/carbon felt to form the final composite bipolar plate. The composite bipolar plate meets requirements of acid resistance, oxidation resistance and no seepage for an electrode plate of a vanadium battery; the strength, the specific surface area and the conductivity of the electrode plate are improved and increased; the resistivity is reduced; a technology is simple; the processing cost is low; and the service life is long.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of liquid flow batteries, in particular to a preparation method of a composite bipolar plate for an all-vanadium redox flow battery. [0003] (2) Background technology [0004] The advantages of all-vanadium redox flow batteries are mainly manifested in: the self-discharge of the battery is very small; the conversion efficiency of charge and discharge is high; Safe and pollution-free, it is an ideal green battery, in line with modern environmental protection concepts. All-vanadium redox flow batteries are often used to stabilize the output of renewable energy such as solar energy and wind energy, and solve the problem that they are difficult to connect to the grid due to large fluctuations and instability; they are used for large-scale energy storage in power systems, shaving valleys and filling peaks, and load power balance ; Power quality management and control; can also be used for UPS and emer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/18
CPCH01M8/0228H01M8/18Y02E60/50
Inventor 周翔
Owner 周翔
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