Bipolar plate for vanadium battery and preparation method of bipolar plate

A bipolar plate, vanadium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of high resistivity of polymer-carbon black composite bipolar plates, increased surface resistance of bipolar plates, and uniform material mixing. The degree of difficulty is difficult to guarantee and other problems, to achieve the effect of eliminating contact resistance, improving consistency, and ensuring reliability

Active Publication Date: 2015-03-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 bipolar plate for a vanadium battery and a preparation method thereof, which solves the difficulty in ensuring the uniformity of material mixing in the prior art, and the resistance of the polymer-carbon black composite bipolar plate The high rate and the increase of the surface resistance of the bipolar plate caused by electrochemical corrosion

Method used

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  • Bipolar plate for vanadium battery and preparation method of bipolar plate
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preparation example Construction

[0026] The preparation method of the bipolar plate for the vanadium battery, the specific steps are as follows:

[0027] 1) The silane coupling agent is made into a dilute solution with a concentration of 0.5-1wt%, the solvent is a solution prepared by water and alcohol, and the solution ratio is silane (20wt%), ethanol (72wt%), water (8wt%), adjust the pH When the value reaches 4-5, immerse the whole carbon fiber cloth in the coupling agent solution for 10-30 minutes, take it out, and dry it at room temperature for later use.

[0028] 2) After mixing synthetic resin and solvent, add metal powder and mix well, then add curing agent to make conductive adhesive;

[0029] 3) Immerse the carbon fiber cloth in the conductive adhesive for 10-60 minutes, take it out and let it stand for 30-120 minutes as a matrix for use;

[0030] 4) Put the carbon material into the bottom layer of the mold, add the matrix and add another layer of carbon material, and make a bipolar plate for vanadi...

Embodiment 1

[0033] Silane coupling agent is made into the dilute solution of 0.5wt% concentration, and solvent is the solution that water and alcohol prepare, and solution ratio is silane coupling agent (20wt%), ethanol (72wt%), water (8wt%), adjust pH When the value reaches 4, immerse the whole carbon fiber cloth in the coupling agent solution for 10 minutes, take it out, and dry it at room temperature for later use. After mixing epoxy resin and acetone, add silver powder and mix thoroughly, then add triethylenetetramine to make conductive adhesive; soak the carbon fiber cloth in the conductive adhesive for 20 minutes, take it out and let it stand for 30 minutes as a matrix for use; take 0.3mm pure Put the graphite powder into the bottom layer of the mold, add the matrix and add a layer of 0.3mm pure graphite powder, and make a bipolar plate for vanadium battery after hot pressing; the hot pressing temperature is 120°C, the hot pressing time is 120min, and the hot pressing pressure is 5MP...

Embodiment 2

[0037] Silane coupling agent is made into the dilute solution of 0.6wt% concentration, and solvent is the solution that water and alcohol prepare, and solution ratio is silane coupling agent (20wt%), ethanol (72wt%), water (8wt%), adjust pH When the value reaches 5, immerse the whole carbon fiber cloth in the coupling agent solution for 20 minutes, take it out, and dry it at room temperature for later use. After mixing epoxy resin and ethanol, add copper-coated silver powder, mix thoroughly, and then add ethylenediamine to make a conductive adhesive; soak the carbon fiber cloth in the conductive adhesive for 30 minutes, take it out and let it stand for 40 minutes as a matrix for use; take 1mm carbon Put the black into the bottom layer of the mold, add the matrix and add another layer of 1mm carbon black, and make a bipolar plate for vanadium battery after hot pressing; the hot pressing temperature is 160°C, the hot pressing time is 180min, and the hot pressing pressure is 10MPa...

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Abstract

The invention relates to the field of manufacturing of vanadium batteries and particularly relates to a bipolar plate for a vanadium battery and a preparation method of the bipolar plate, aiming at solving the problems in the prior art that high uniform degree of mixing of materials of the bipolar plate is hardly guaranteed, the resistance rate of a polymer-carbon black composite bipolar plate is too high, the surface resistance of the bipolar plate is increased by electrochemical corrosion. The preparation method of the bipolar plate for the vanadium battery comprises the following steps: immersing pretreated carbon fiber cloth into conductive glue and curing to obtain a base body, and carrying out hot-pressing compounding on the base body and a carbon material by a pressing machine to finally obtain the bipolar plate. According to the preparation method, the conductive glue is prepared from macromolecular resin with good high temperature resistance and corrosion resistance and metal powder; the selected carbon fiber cloth is pretreated firstly, and then immersed into the conductive glue and finally cured to serve as the base body, and the carbon material and the base body are compounded by hot pressing to prepare the high-conductivity, high-strength and corrosion-resisting bipolar plate. The bipolar plate provided by the invention has high conductivity; and the consistency between single vanadium battery pieces is improved after the compounding, and the mechanical strength is high so that the reliability of the vanadium battery is guaranteed.

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 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 dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8652H01M4/8657H01M4/8875Y02E60/50
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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