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A kind of preparation method of bipolar plate of graphite-based composite material

A technology of composite materials and bipolar plates, applied in fuel cells, final product manufacturing, sustainable manufacturing/processing, etc. Large-scale mass production and other issues to achieve good high thermal stability, good dimensional stability, and low manufacturing costs

Active Publication Date: 2021-09-28
江苏国氢氢能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface treatment process of metal bipolar plates is relatively complicated and the cost is high, and it is still not possible for mass production
[0006] Graphite-based bipolar plates are usually machined to form graphite-based bipolar plates. The forming method is usually to mix carbon powder or graphite powder with graphitizable resin, and then graphitize at high temperature after machine pressing. After that, the The graphite plate is impregnated and sealed, and then the required gas and liquid channels are processed on the surface by CNC machine tools, but the machining process will cause the problem of high cost of the graphite-based bipolar plate, and the processing cost of the machining process occupies 50% of the cost of the entire graphite-based bipolar plate, and the yield rate is not high, so it cannot be mass-produced in large quantities

Method used

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  • A kind of preparation method of bipolar plate of graphite-based composite material
  • A kind of preparation method of bipolar plate of graphite-based composite material
  • A kind of preparation method of bipolar plate of graphite-based composite material

Examples

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Embodiment 1

[0027] A method for preparing a graphite-based composite material bipolar plate, comprising the following steps:

[0028] (1) Add carbon nanotubes to the graphite powder, stir and mix under the condition that the ultrasonic power is 300W, the temperature is 60°C, and the rotating speed is 230r / min, so that the two form a homogeneous composite graphite powder, by mass fraction, The composite graphite powder contains 15% carbon nanotubes, the particle size of the graphite powder is greater than 25 meshes, and the particle size of the composite graphite powder is less than 400 meshes;

[0029] (2) Mix the thermosetting resin with the free radical polymerization initiator to obtain mixture A, mix mixture A with a release agent to obtain mixture B, mix mixture B with a shrinkage agent to obtain mixture C, mix mixture C with a tackifier to obtain mixture D, and mix D is dissolved in a solvent to obtain a mixture E containing a thermosetting resin;

[0030] (3) Mix the composite gra...

Embodiment 2

[0043] A method for preparing a graphite-based composite material bipolar plate, comprising the following steps:

[0044] (1) Add carbon nanotubes to the graphite powder, stir and mix under the conditions of ultrasonic power of 250W, temperature of 65°C, and rotating speed of 200r / min, so that the two form a homogeneous composite graphite powder, calculated by mass fraction. The composite graphite powder contains 6% carbon nanotubes, the particle size of the graphite powder is greater than 30 meshes, and the particle size of the composite graphite powder is less than 400 meshes;

[0045] (2) Mix the thermosetting resin with the free radical polymerization initiator to obtain mixture A, mix mixture A with a release agent to obtain mixture B, mix mixture B with a shrinkage agent to obtain mixture C, mix mixture C with a tackifier to obtain mixture D, and mix D is dissolved in a solvent to obtain a mixture E containing a thermosetting resin;

[0046](3) Mix the composite graphit...

Embodiment 3

[0059] A method for preparing a graphite-based composite material bipolar plate, comprising the following steps:

[0060] (1) Add carbon nanotubes to the graphite powder, and stir and mix under the conditions that the ultrasonic power is 150W, the temperature is 45°C, and the rotating speed is 180r / min, so that the two form a homogeneous composite graphite powder, by mass fraction, The composite graphite powder contains 10% carbon nanotubes, the particle size of the graphite powder is greater than 20 meshes, and the particle size of the composite graphite powder is less than 400 meshes;

[0061] (2) Mix the thermosetting resin with the free radical polymerization initiator to obtain mixture A, mix mixture A with a release agent to obtain mixture B, mix mixture B with a shrinkage agent to obtain mixture C, mix mixture C with a tackifier to obtain mixture D, and mix D is dissolved in a solvent to obtain a mixture E containing a thermosetting resin;

[0062] (3) Mix the composit...

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Abstract

The invention belongs to the technical field of fuel cells, and in particular relates to a preparation method of a graphite-based composite material bipolar plate. The fuel cell graphite composite material bipolar plate of the present invention is prepared by the method of mixed material molding (BMC) of thermosetting resin and composite graphite powder, wherein the main constituent medium of the composite graphite powder is graphite and carbon nanotubes, and the particle size of the graphite is 25‑400 mesh, in which the carbon nanotubes are surface-treated by the Fenton reagent method as a reinforcement of the composite graphite powder material, and the carbon nanotubes are passivated by the air oxidation method to make the surface smooth and free from intertwining. Thereby improving the purity of the carbon nanotubes and improving the performance of the composite graphite powder. The preparation method of the invention can significantly improve the conductivity, mechanical properties, anti-corrosion performance and gas barrier performance of the graphite-based composite material bipolar plate, and the manufacturing cost is lower.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a preparation method of a graphite-based composite material bipolar plate. Background technique [0002] Graphite has good and excellent chemical stability and electrical conductivity, and was first used in the manufacture of proton exchange membrane fuel cell (PEMFC) bipolar plates. There are three main types of bipolar plates: graphite bipolar plates, metal bipolar plates and composite bipolar plates. Graphite bipolar plates, graphite is brittle and fragile, can be processed by CNC to produce a specific flow field and shape, but the processing time is long, and the quality is difficult to guarantee, it cannot be mass-produced, the requirements for equipment are high, and the cost is difficult Control is a processing technology used for scientific research. [0003] Graphite bipolar plate is made by mixing carbon powder, graphite powder and graphitizable resin, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0213H01M8/0226H01M8/0223
CPCH01M8/0213H01M8/0223H01M8/0226Y02E60/50Y02P70/50
Inventor 林纪峰
Owner 江苏国氢氢能源科技有限公司
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