Method for preparing bipolar plate of vanadium cell

A bipolar plate and vanadium battery technology, which is applied in the parts of fuel cells, final product manufacturing, sustainable manufacturing/processing, etc. The problem of high resistivity of the carbon black composite bipolar plate can improve the reliability, the resistance will not increase, and the processing technology is simple.

Active Publication Date: 2013-04-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to propose a method for preparing a bipolar plate for a vanadium battery, which solves the difficulty in ensuring the uniformity of material mixing in the prior art, and the resistivity of the polymer-carbon black composite bipolar plate. Excessively high and electrochemical corrosion caused problems such as increased surface resistance of the bipolar plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 3mm thick graphite felt (bulk density 0.15g / cm 3 ) and a 2mm thick polyethylene resin plate (PE) were put into the mold and pressed by a hot press with a hot pressing temperature of 180°C, a hot pressing time of 20min, and a hot pressing pressure of 2MPa; after taking it out, put the mold into a cold In the press, the cold pressing temperature is 5° C., the cold pressing time is 20 minutes, and the cold pressing pressure is 2 MPa; it is taken out to be a bipolar plate for a vanadium battery.

[0026] The volume resistivity of the prepared conductive bipolar plate is 0.1Ω.cm. As a vanadium battery positive and negative current collector, the battery charge and discharge performance parameters are: Coulombic efficiency 94.1%, voltage efficiency 83.1%, energy efficiency 78.1%.

Embodiment 2

[0028] 5mm thick graphite felt (bulk density 0.15g / cm 3 ) and a 4mm thick polypropylene resin plate (PP) were put into the mold and pressed by a hot press with a hot pressing temperature of 190°C, a hot pressing time of 25min, and a hot pressing pressure of 3MPa; after taking it out, put the mold into a cold In the press, the cold pressing temperature is 15°C, the cold pressing time is 30min, and the cold pressing pressure is 2MPa; the bipolar plate for vanadium battery is taken out.

[0029] The volume resistivity of the prepared conductive bipolar plate is 0.08Ω.cm. As a vanadium battery positive and negative current collector, the battery charge and discharge performance parameters are: Coulombic efficiency 93.2%, voltage efficiency 84.2%, energy efficiency 78.5%.

Embodiment 3

[0031] 6mm thick graphite felt (bulk density 0.20g / cm 3 ) and a 6mm thick polyvinyl chloride resin board (PVC) are put into the mold and pressed by a hot press at a temperature of 120°C, a hot pressing time of 35min, and a hot pressing pressure of 1MPa; after taking it out, put the mold into In the cold pressing machine, the cold pressing temperature is 10°C, the cold pressing time is 60 minutes, and the cold pressing pressure is 1 MPa; the bipolar plate for vanadium battery is taken out.

[0032] The volume resistivity of the prepared conductive bipolar plate is 0.07Ω.cm. As a vanadium battery positive and negative current collector, the battery charge and discharge performance parameters are: Coulombic efficiency 95.0%, voltage efficiency 84.3%, energy efficiency 80.1%.

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Abstract

The invention relates to the field of manufacturing of vanadium cells, in particular to a method for preparing a bipolar plate of a vanadium cell, and solves the problems that the degree of mixing uniformity of materials is difficult to ensure, the resistivity of a polymer-carbon black composite bipolar plate is very high, the surface resistance of the bipolar plate is increased due to electrochemical corrosion and the like in the prior art. In order to solve the problems, according to the working requirement of the vanadium cell, a carbon fiber electrode with high corrosion resistance is taken as a conductive material to prepare the bipolar plate of the vanadium cell which is high in electric conductivity and simple in manufacturing procedure. The bipolar plate comprises a resin plate and an electrode; and the resin plate and the electrode are thermally pressed and molded to facilitate resin to completely permeate to the electrode so as to prepare the bipolar plate of the vanadium cell. According to the method, the resin is injected to the electrode to serve as a framework material, so that the conductivity is approximate to that of a graphite felt, the electrochemical corrosion resistance is high in the using process, the resistance is not increased and the reliability of the vanadium cell is improved.

Description

technical field [0001] The invention relates to the field of vanadium battery manufacturing, in particular to a method for preparing a bipolar plate for a vanadium battery. Background technique [0002] Vanadium battery, the full name of vanadium ion redox flow battery, is a new type of green battery. The bipolar plate is one of the key components of the all-vanadium redox flow battery. It plays the role of connecting the positive and negative electrodes of different cells and conducting the internal circuit of the battery. It is required to have good electrical conductivity, mechanical strength, chemical oxidation resistance and electric resistance. Chemical corrosion performance. The optional materials mainly include metal bipolar plates, pure graphite bipolar plates and polymer-carbon composite bipolar plates. Due to the price and corrosion resistance of metal bipolar plates, they are rarely studied and used. Pure graphite bipolar plates are easily broken during proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02
CPCY02E60/50Y02P70/50
Inventor 侯绍宇杨志刚刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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