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A bipolar plate for an all-vanadium redox flow battery and its preparation process

An all-vanadium redox flow battery and a preparation process technology are applied in the field of a bipolar plate for an all-vanadium redox flow battery and its preparation technology, which can solve the problem of affecting the efficiency and service life of the battery, the high conductivity of the pure graphite plate, and the corrosion resistance of the electrolyte solution. Poor performance and other problems, to achieve uniform and controllable performance, good electrical conductivity, good corrosion resistance

Active Publication Date: 2020-08-07
杭州德海艾科能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pure graphite plate has high electrical conductivity but poor electrolyte corrosion resistance and low mechanical strength. Corrosion of graphite plate will affect battery efficiency and service life
Conductive plastic composite bipolar plates have good corrosion resistance and mechanical strength, but poor conductivity and low battery efficiency

Method used

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  • A bipolar plate for an all-vanadium redox flow battery and its preparation process
  • A bipolar plate for an all-vanadium redox flow battery and its preparation process
  • A bipolar plate for an all-vanadium redox flow battery and its preparation process

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preparation example Construction

[0042] (1) The preparation of silane coupling agent and the treatment steps of grid carbon cloth are as follows:

[0043] Prepare a 0.5-1wt% silane coupling agent solution with ethanol and water as a solvent, soak the grid carbon cloth in it for 10-30 minutes, or spray the grid carbon cloth by spraying method, and let it stand until it is dry on the surface.

[0044] Grid carbon cloth: mesh size 1*1mm-10*10mm, thickness 0.2-1mm.

[0045] (2) The preparation steps of graphite-filled conductive adhesive are as follows:

[0046] A preparation process for a bipolar plate of an all-vanadium redox flow battery. The production process adopts an internal mixer and a flat vulcanizer, and the epoxy resin, graphite powder, conductive additive, curing agent, diluent and coupling The agent is divided into three groups, the epoxy resin and half of the graphite powder are the first group, the other half of the graphite powder and the conductive additive are the second group, the curing agen...

Embodiment 1

[0060] (1) Prepare a KH550 solution with a concentration of 0.5wt%, soak the grid carbon cloth in it for 30 minutes, take it out and dry it for later use.

[0061] (2) 20g epoxy resin E-44, 4g curing agent T31, 24g graphite powder, 0g carbon fiber, 0g carbon black, 0g diluent, 0.5g coupling agent, are placed in the internal mixer, rotating speed 20r / min, Knead to prepare graphite conductive adhesive premix.

[0062] (3) Take out the premix and place it in the mill, the speed of the mill is 10r / min, adjust the distance between the rollers to 0.5mm, remove the sheet after the milling is completed, and cut it for later use.

[0063] (4) Take a flexible graphite plate with a thickness of 1.6mm, treat the surface of one side of the flexible graphite plate with KH550 solution, and stack it in sequence according to the order of graphite plate, conductive adhesive sheet, grid carbon cloth, conductive adhesive sheet, and graphite plate, wherein KH550 Place the solution-treated surface...

Embodiment 2

[0065] (1) Prepare a KH550 solution with a concentration of 0.5wt%, soak the grid carbon cloth in it for 30 minutes, take it out and dry it for later use.

[0066] (2) 19g epoxy resin E-44, 4g curing agent T31, 22g graphite powder, 2g carbon fiber, 0g carbon black, 1g diluent, 0.5g coupling agent are placed in the internal mixer, the internal mixer speed 20r / min, kneading to prepare graphite conductive adhesive premix.

[0067] (3) Take out the premix and place it in the mill, the speed of the mill is 10r / min, adjust the distance between the rollers to 0.5mm, remove the sheet after the milling is completed, and cut it for later use.

[0068] (4) Take a flexible graphite plate with a thickness of 1.6mm, treat the surface of one side of the flexible graphite plate with KH550 solution, and stack it in sequence according to the order of graphite plate, conductive adhesive sheet, grid carbon cloth, conductive adhesive sheet, and graphite plate, wherein KH550 Place the solution-tr...

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Abstract

An all-vanadium redox flow battery bipolar plate and a preparation process thereof. The all-vanadium redox flow battery bipolar plate comprises a silane coupling agent solution, mesh carbon cloth treated with the silane coupling agent solution, a flexible graphite plate and a conductive adhesive. The conductive adhesive is a graphite-filled conductive adhesive. The bipolar plate is prepared by heating and pressing the flexible graphite plate, the graphite-filled conductive adhesive, the mesh carbon cloth, the graphite-filled conductive adhesive and the flexible graphite plate in sequence withthe vacuum molding technology; and the graphite-filled conductive adhesive is used as a binder. The invention reduces the use of an organic solvent; the preparation process adopts an internal mixer and a open mill for the conductive adhesive preparation and the vacuum molding for the composite bipolar plate preparation so that the operation process is more automatic and the product performance isbetter and more stable; the prepared vanadium battery composite bipolar plate material has the advantages of high electrical conductivity, good corrosion resistance, excellent mechanical properties and good product stability; and the defects of pure graphite plate and conductive plastic as a bipolar plate material in a vanadium battery are solved.

Description

technical field [0001] The invention belongs to the field of vanadium redox flow battery manufacturing, and specifically relates to a bipolar plate for an all-vanadium redox flow battery and a preparation process thereof. Background technique [0002] The all-vanadium redox flow battery is a new type of environmentally friendly energy storage battery. The bipolar plate material is one of the important components, which mainly plays the role of isolating the positive and negative electrolytes and serving as the current collector of the internal circuit of the battery. Traditional bipolar plate materials are mostly pure graphite plates and conductive plastic composite bipolar plates. Pure graphite plate has high electrical conductivity but poor electrolyte corrosion resistance and low mechanical strength. Corrosion of graphite plate will affect battery efficiency and service life. Conductive plastic composite bipolar plates have good corrosion resistance and mechanical streng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0213H01M8/0221H01M8/0228H01M8/18
CPCY02E60/50
Inventor 王宇熊仁海吕玉康
Owner 杭州德海艾科能源科技有限公司
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