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Method for preparing electroconductive plastic bipolar plate for vanadium cell

A conductive plastic, bipolar plate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficulty in ensuring the uniformity of material mixing, high contact resistance, and high resistivity of composite bipolar plates, and improve vanadium batteries. The effect of performance, good contact and simple processing

Active Publication Date: 2015-03-25
辽宁科京新材料有限公司
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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 conductive plastic bipolar plate for a vanadium battery, which solves the difficulty in ensuring the uniformity of material mixing in the prior art and the problem of polymer-carbon material composite bipolar plates. Plate resistivity is too high and contact resistance is too large

Method used

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  • Method for preparing electroconductive plastic bipolar plate for vanadium cell
  • Method for preparing electroconductive plastic bipolar plate for vanadium cell
  • Method for preparing electroconductive plastic bipolar plate for vanadium cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The mass ratio of raw materials used in the high conductivity bipolar plate extrusion process for vanadium batteries is as follows:

[0046] PE 45 (particle size range 50~80μm)

[0047] Conductive carbon black 45 (particle size range 20~50μm)

[0048] Auxiliary 10

[0049] In this embodiment, the additives are isopropanol and dioctyl phthalate, and the mass ratio of isopropanol and dioctyl phthalate is 1:1.

[0050] The mass ratio of raw materials for spraying conductive agent is:

[0051] Conductive carbon black 30 (particle size range 20~50μm)

[0052] PE 20 (particle size range 50~80μm)

[0053] Absolute ethanol 50

[0054] First of all, the total mass of the above-mentioned extrusion process raw materials is 100kg, placed in a high mixer, the stirring speed is 900 rpm, and stirred for 20 minutes. Then put it into the twin-screw, extrude at 190℃~210℃, the screw speed is 220r.min -1 , and then put 100kg of spraying raw material in the spraying device, and spray...

Embodiment 2

[0057] The mass ratio of raw materials used in the high conductivity bipolar plate extrusion process for vanadium batteries is as follows:

[0058] PP 50 (particle size range 50~80μm)

[0059] Conductive carbon black 40 (particle size range 20~50μm)

[0060] Auxiliary 10

[0061] In this embodiment, the additives are liquid paraffin and dioctyl phthalate, and the mass ratio of liquid paraffin and dioctyl phthalate is 1:2.

[0062] The mass ratio of raw materials for spraying conductive agent is:

[0063] Conductive carbon black 25 (particle size range 20~50μm)

[0064] PP 20 (particle size range 50~80μm)

[0065] Absolute ethanol 55

[0066] First of all, the total mass of the above-mentioned extrusion process raw materials is 100kg, placed in a high-speed mixer, the stirring speed is 800 rpm, and stirred for 20 minutes. Then put it into the twin-screw, extrude at 190℃~210℃, the screw speed is 220r.min -1 , and then put the spraying raw material with a mass of 100kg in ...

Embodiment 3

[0069] The mass ratio of raw materials used in the high conductivity bipolar plate extrusion process for vanadium batteries is as follows:

[0070]

[0071] In this embodiment, the additives are solvent oil and dioctyl phthalate, and the mass ratio of solvent oil and dioctyl phthalate is 1:3.

[0072] The mass ratio of raw materials for spraying conductive agent is:

[0073] Conductive carbon black 30 (particle size range 20~50μm)

[0074] PE 20 (particle size range 50~80μm)

[0075] Absolute ethanol 50

[0076] First of all, the total mass of the above-mentioned extrusion process raw materials is 100kg, placed in a high mixer, the stirring speed is 900 rpm, and stirred for 20 minutes. Then put it into the twin-screw, extrude at 190℃~210℃, the screw speed is 220r.min -1 , and then put 100kg of spraying raw material in the spraying device, and spray it on the surface of the extruded material synchronously with the extruder.

[0077] The volume resistivity of the prepare...

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Abstract

The invention relates to the field of preparation a vanadium cell, in particular to a method for preparing an electroconductive plastic bipolar plate for the vanadium cell, solving problem that material mixing uniformity degree is hard to ensure in the prior art. The method comprises the following steps of: uniformly mixing electroconductive plastic raw materials in a high-speed mixing machine, extruding and forming by a double-screw extruder, and coating an electroconductive agent on the surface of a plastic plate in a spraying manner to obtain the electroconductive plastic bipolar plate. The method has the beneficial effects that according to working requirements of the vanadium cell, macromolecular resin resisting against high temperature and corrosion and the electroconductive agent are selected and are extruded by the double-screw extruder to prepare the electroconductive plastic bipolar plate with high electric conductivity, high strength and corrosion resistance by utilizing a surface carbon spraying technique; and the electrical resistivity can reach 0.1-0.3 omega. cm and meet the use requirement of the vanadium cell. The electroconductive plastic bipolar plate prepared by the method disclosed by the invention, has the advantages of high electric conductivity, large specific surface area, good contact with an electrode, capabilities o reducing resistance of the vanadium cell, improving performances of the vanadium cell and reducing the cost of the vanadium cell further, and stable operation in the vanadium cell.

Description

technical field [0001] The invention relates to the field of vanadium battery manufacture, in particular to a method for preparing a conductive plastic 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 bro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 孙猛
Owner 辽宁科京新材料有限公司