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Flexible ultrathin graphite bipolar plate and preparation method thereof

A bipolar plate, ultra-thin technology, applied in the direction of fuel cells, electrochemical generators, electrical components, etc., can solve the problems of unsatisfactory compressive strength, graphite bipolar plate flow channel, low precision, high residual rate, etc. Achieve the effect of reducing hydrogen permeability, avoiding hydrogen leakage and increasing electrical conductivity

Active Publication Date: 2021-08-06
苏州然普能源有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In the prior art, solid resin powder and graphite powder are mainly mixed, and graphite bipolar plates are produced after hot pressing, wherein the resin powder mainly plays the role of bonding graphite, mainly thermoplastic resin, due to the two The powder is not uniform during the mixing process, which will lead to the flow channel of the graphite bipolar plate, the accuracy is low, the compressive strength is not ideal, and the residual product rate is high

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  • Flexible ultrathin graphite bipolar plate and preparation method thereof

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preparation example Construction

[0019] An embodiment of the present invention provides a method for preparing a flexible ultra-thin graphite bipolar plate, including:

[0020] Graphite powder material is provided, and described graphite powder material comprises expanded graphite, carbon fiber, carbon nanotube and low-viscosity liquid binder;

[0021] Provide a carbon nanotube film, and use physical or chemical methods to roughen the surface of the carbon nanotube film;

[0022] Graphite powder material layers formed by the graphite powder material are arranged on both sides of the carbon nanotube film, and the two layers of the graphite powder material layer are combined with the carbon nanotube film by hot pressing to form a flexible ultra-thin film. Graphite bipolar plates.

[0023] Further, the pressure of hot pressing is 5-22MPa, the temperature is 100-250°C, and the time is 1-30min.

[0024] Further, the preparation method of the flexible ultra-thin graphite bipolar plate also includes: calcining the...

Embodiment 1

[0048] Embodiment 1 Preparation of flexible ultra-thin graphite bipolar plate

[0049] 1) Mix 70 parts of expanded graphite, 20 parts of carbon fiber, and 10 parts of carbon nanotubes, then add 10 parts of liquid special phenolic resin binder, mix and stir for 3 hours to make the powder wet;

[0050] 2) Bake the mixed wet powder at 50°C for 2 hours to remove a small amount of liquid solvent;

[0051] 3) heat the carbon nanotubes in a hydrogen peroxide-sulfuric acid solution at 90°C for 2 hours, so that the surface of the carbon nanotubes is hydroxylated, and this treatment can increase the binding force between the carbon nanotubes and the surface of the graphite powder;

[0052] 4) Put an appropriate amount of the powder material in step 2) on the surface of the mold, press lightly to flatten it, and then spread a layer of carbon nanotube film, and then add an appropriate amount of powder material in step 2) on the nanotube film , using a mold for hot pressing, the hot press...

Embodiment 2

[0055] Embodiment 2 Preparation of flexible ultra-thin graphite bipolar plate

[0056] 1) Mix 80 parts of expanded graphite, 10 parts of carbon fiber, and 10 parts of carbon nanotubes, then add 10 parts of liquid special melamine resin binder, mix and stir for 4 hours to make the powder wet.

[0057] 2) Bake the above mixed wet powder at 60° C. for 1 hour to remove a small amount of liquid solvent.

[0058] 3) Use a laser marking machine to punch holes on the surface of the carbon nanotubes to roughen the surface, which is used to increase the bonding force between the carbon nanotubes and the surface of the graphite powder.

[0059] 4) Put an appropriate amount of the powder material in step 2) on the surface of the mold, press lightly to flatten it, and then spread a layer of carbon nanotube film, and then add an appropriate amount of powder material in step 2) on the nanotube film , using a mold for hot pressing, the hot pressing pressure is 22MPa, the hot pressing tempera...

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Abstract

The invention discloses a flexible ultrathin graphite bipolar plate and a preparation method thereof. The preparation method comprises the following steps that: a graphite powder material is provided, wherein the graphite powder material comprises expanded graphite, carbon fibers, carbon nanotubes and a low-viscosity liquid binder; a carbon nanotube film is provided, and roughening treatment is carried out on the surface of the carbon nanotube film by adopting a physical or chemical method; graphite powder material layers formed by the graphite powder material are arranged on the surfaces of the two sides of the carbon nano tube film, and the two graphite powder material layers and the carbon nano tube film are combined in a hot pressing mode to form the flexible ultrathin graphite bipolar plate. According to the preparation method of the flexible ultrathin graphite bipolar plate provided by the embodiment of the invention, the carbon nanotube film is used, so that the hydrogen permeability of the bipolar plate is greatly reduced, and meanwhile, the bipolar plate has good flexibility and strength.

Description

technical field [0001] The invention relates to a bipolar plate, in particular to a flexible ultra-thin graphite bipolar plate and a preparation method thereof, belonging to the technical field of fuel cells. Background technique [0002] Fuel cells have broad prospects for development and can be widely used in distributed power generation systems, electric vehicles and other fields. The fuel cell bipolar plate is composed of a pole plate and a flow field. Its main functions are gas distribution, current collection, heat conduction and sealing. Its performance determines the volume specific power and mass specific power of the fuel cell stack. It is the core component of the fuel cell. The weight accounts for 70-80% of the entire battery stack. [0003] At present, bipolar plates are mainly divided into graphite bipolar plates and metal alloy bipolar plates. Graphite bipolar plates occupy a mainstream position in the fuel cell market due to their excellent chemical stabilit...

Claims

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Application Information

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IPC IPC(8): H01M8/0228H01M8/0213B82Y30/00
CPCH01M8/0228H01M8/0213B82Y30/00Y02E60/50
Inventor 朱怡沈杨彬
Owner 苏州然普能源有限公司
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