A kind of bipolar plate for vanadium battery and preparation method thereof

A bipolar plate and vanadium battery technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of large body resistance, low mechanical strength, poor battery performance, etc., achieve good conductivity, balance mechanical strength, improve Effect of Mechanical Strength and Corrosion Resistance

Active Publication Date: 2020-09-18
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

[0003] In order to overcome the deficiencies of the prior art, the object of the present invention is to propose a bipolar plate for a vanadium battery and a preparation method thereof, so as to solve the problem of the low mechanical strength, poor corrosion resistance, and large body resistance of the bipolar plate in the prior art, which lead to internal damage in the battery. Large resistance, poor battery performance, etc.

Method used

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  • A kind of bipolar plate for vanadium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Place a 0.3mm thick carbon cloth in an incubator, control the temperature at 200°C, put polypropylene powder with a particle size of 0.04mm into the spray gun, and spray it on both sides of the carbon cloth with a coating thickness of 0.5mm, and then Graphite powder with a particle size of 0.02mm is sprayed on the surfaces of both sides of the resin layer, the coating thickness is 0.05mm, and then it is put into a mold and hot-pressed on a hot press to make a bipolar plate for a vanadium battery. The hot-pressing temperature is 175°C, the hot pressing time is 55min, and the hot pressing pressure is 18MPa.

[0026] The bipolar plates prepared in this example assemble 2KW vanadium batteries, and the battery charge and discharge performance parameters are: Coulombic efficiency 95.2%, voltage efficiency 85.8%, energy efficiency 81.7%, compared with the existing carbon-plastic bipolar plates, the voltage efficiency has improved 4.3%.

Embodiment 2

[0028] Place a 0.8mm thick carbon cloth in an incubator, control the temperature at 250°C, put polypropylene powder with a particle size of 0.05mm into the spray gun, and spray it on both sides of the carbon cloth with a coating thickness of 1.0mm. Spray carbon black powder with a particle size of 0.02mm on the surface of both sides of the resin layer, the coating thickness is 0.1mm, and then put it into the mold and press it on a hot press to make a bipolar plate for a vanadium battery. The temperature is 185°C, the hot pressing time is 25min, and the hot pressing pressure is 25MPa.

[0029] The bipolar plates prepared in this example assemble a 2KW vanadium battery, and the battery charge and discharge performance parameters are: Coulombic efficiency 96.5%, voltage efficiency 86.5%, and energy efficiency 83.5%. Compared with the existing carbon-plastic bipolar plates, the voltage efficiency has improved 5%.

Embodiment 3

[0031] Place a 0.5mm thick carbon cloth in an incubator, control the temperature at 210°C, put polyethylene powder with a particle size of 0.06mm into the spray gun, and spray it on both sides of the carbon cloth with a coating thickness of 0.5mm, and then Spray carbon fiber powder with a particle size of 0.10mm on the surface of both sides of the resin layer, the coating thickness is 0.13mm, and then put it into the mold and press it on a hot press to make a bipolar plate for a vanadium battery. The hot pressing temperature is 155°C, the hot pressing time is 35min, and the hot pressing pressure is 20MPa.

[0032] The bipolar plates prepared in this example assemble a 2KW vanadium battery, and the battery charge and discharge performance parameters are: Coulombic efficiency 95.9%, voltage efficiency 86.0%, and energy efficiency 82.5%. Compared with the existing carbon-plastic bipolar plates, the voltage efficiency has improved 4.5%.

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Abstract

The invention relates to the field of vanadium battery manufacturing, and in particular relates to a bipolar plate for a vanadium battery and a preparation method thereof. A thermal spraying method isselected, first, a resin layer is respectively sprayed on both sides of carbon cloth, after curing, a conductive layer is respectively sprayed on both sides of the resin layer, and the bipolar plateis molded by heat-pressing on a hot press. The method solves the problems that in the prior art the bipolar plate has low mechanical strength, poor corrosion resistance, large body resistance to causelarge internal resistance of the battery, poor battery performance, and the like. Compared with the prior art, the bipolar plate of the vanadium battery prepared by the method adopts the carbon clothas a skeleton material, the mechanical strength and the corrosion resistance of the bipolar plate are improved, the carbon cloth is a carbon material, and the electric conductivity is good, and the conductivity of the bipolar plate are greatly improved.

Description

technical field [0001] The invention relates to the field of vanadium battery manufacturing, in particular to a bipolar plate for a vanadium battery and a preparation method thereof. Background technique [0002] Vanadium battery, the full name of vanadium ion redox flow battery, is a new type of green battery. The cycle efficiency of the battery can be improved in many ways, for example: reducing the internal resistance of the battery. The bipolar plate is one of the key components of the all-vanadium redox flow battery, which must be balanced in terms of mechanical strength, flexibility, and electrical conductivity. A lot of research has been done on how to improve the bipolar plate, such as: a new type of bipolar plate and terminal electrode with a resistivity of 0.5Ω.cm polyethylene, and a copolymer of PP and SEBS with a resistivity of 0.1Ω.cm has also been used in experiments tested in a vanadium battery. The bipolar plates used in the prior art have low mechanical s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18H01M8/0228H01M8/0213H01M8/0221
CPCH01M8/0213H01M8/0221H01M8/0228H01M8/188Y02E60/50
Inventor 侯绍宇肖伟刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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