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A method for preparing ultra-thin carbon/carbon composite bipolar plate

A carbon composite material, bipolar plate technology, applied in fuel cells, electrical components, electrochemical generators, etc., can solve the problems of increasing workload, complicated methods, affecting the accuracy of the flow channel, etc., and achieve the effect of ensuring the accuracy of the flow channel

Active Publication Date: 2022-01-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2000, the Oak Ridge National Experiment in the United States used the combination of Slurry molding (grouting molding) and CVI to prepare the first C / C composite bipolar plate, and its conductivity was that of the graphite / polymer composite bipolar plate. About 2 times, reaching 300S / cm, the bending strength is 175MPa, which can reach 3-4 times that of graphite / polymer composite bipolar plates, and its excellent performance highlights better applications than carbon / polymer composite bipolar plates prospects, but at that time the preparation process was complicated and the cost was high, and the C / C composite bipolar plate did not attract the attention of the industry
The mixing of polymer resins and fillers and the mixing of carbon-containing slurries generally use simple mechanical stirring, which cannot ensure uniform dispersion of resins and fillers
[0005] For the curing and molding of carbon / carbon composite bipolar plates, the patent "Method for Preparing Carbon / Carbon Composite Bipolar Plates for Proton Exchange Membrane Fuel Cells" (CN 1540787 A) directly carbonizes after curing, without considering the process of curing Deformation of the bipolar plate
In addition, in the patent "Method for Preparing Carbon / Carbon Composite Bipolar Plate for Proton Exchange Membrane Fuel Cell" (CN1540787 A), the flow path of the bipolar plate is obtained by casting in a metal mold with a reverse gas flow path. This method is complicated and cannot achieve large-scale production of bipolar plates, nor can it guarantee the accuracy of the flow channel; After sintering, the semi-finished bipolar plate is resin-impregnated and sealed to obtain a carbon / carbon composite bipolar plate, but the excess resin needs to be removed by mechanical grinding in the later stage, which not only increases the workload, but also affects the accuracy of the flow channel
The additives and glues used in the preparation process of carbon / carbon composite bipolar plates will affect the conductivity of the bipolar plates after the bipolar plates are formed, but the importance of debinding is not mentioned in the current production. process

Method used

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  • A method for preparing ultra-thin carbon/carbon composite bipolar plate

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Embodiment 1

[0061] A method for preparing an ultra-thin carbon / carbon composite bipolar plate, comprising the following steps:

[0062] 1. Select the skeleton carbon felt roll made by the ultra-fine carbon fiber mesh tire forming process, the thickness is controlled at about 0.5mm, it is a dense felt formed by the interlaced network structure of carbon fibers, and there are gaps between the carbon fibers;

[0063] 2. Prepare uniformly dispersed high carbon residue slurry, that is, graphene modified resin / asphalt slurry dispersion technology, put 15wt% of asphalt, 4wt% of polyvinyl alcohol, and 11wt% of polyethylene resin into an internal mixer for processing Pressing and mixing, the temperature is 300 ℃, so that the additives, resin, asphalt, etc. are fully mixed and even;

[0064] 3. Put the skeleton carbon felt roll into the uniformly dispersed high carbon residue slurry for hot soaking, the temperature is controlled at 80°C, and the time is 5 hours;

[0065] 4. Use the calendering met...

Embodiment 2

[0073] A method for preparing an ultra-thin carbon / carbon composite bipolar plate, comprising the following steps:

[0074] 1. Select the skeleton carbon felt roll made by the ultra-fine carbon fiber mesh tire forming process, the thickness is controlled at about 0.5mm, it is a dense felt formed by the interlaced network structure of carbon fibers, and there are gaps between the carbon fibers;

[0075] 2. Prepare uniformly dispersed high carbon residue slurry, that is, graphene modified resin / asphalt slurry dispersion technology, put 15wt% of asphalt, 2wt% of polyvinyl alcohol, and 13wt% of polycarbonate into an internal mixer at 300 ℃ for pressurized internal mixing to fully mix the additives with resin, asphalt, etc.;

[0076] 3. Put the skeleton carbon felt roll into the uniformly dispersed high-residual carbon slurry and heat-soak at a temperature of 80°C for 4 hours;

[0077] 4. Use the calendering method to carry out rough rolling on the hot-dipped material, and change ...

Embodiment 3

[0085] A method for preparing an ultra-thin carbon / carbon composite bipolar plate, comprising the following steps:

[0086] 1. Select the skeleton carbon felt roll made by the ultra-fine carbon fiber mesh tire forming process, the thickness is controlled at about 0.5mm, it is a dense felt formed by the interlaced network structure of carbon fibers, and there are gaps between the carbon fibers;

[0087] 2. Prepare uniformly dispersed high carbon residue slurry, that is, graphene modified resin / asphalt slurry dispersion technology, put 16wt% of asphalt, 3wt% of polyvinyl alcohol, and 11wt% of polypropylene resin into an internal mixer at 350 ℃ for pressurized internal mixing to fully mix the additives with resin, asphalt, etc.;

[0088] 3. Put the skeleton carbon felt roll into the uniformly dispersed high carbon residue slurry for hot soaking, the temperature is controlled at 80°C, and the time is 5 hours;

[0089] 4. Use the calendering method to carry out rough rolling on th...

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Abstract

The invention discloses a method for preparing an ultra-thin carbon / carbon composite material bipolar plate, which adopts an ultra-fine carbon fiber mesh forming process, a graphene modified resin / asphalt slurry dispersion technology, and carbon fiber mesh / slurry flow field calendering Forming process, large-scale bipolar plate CVI (Chemical Vapor Infiltration chemical vapor infiltration) densification process. By designing and optimizing each step of the process, the present invention obtains a low-cost, ultra-thin, high-strength, and high-conductivity C / C composite bipolar plate, which has good strength, elasticity and thermal conductivity, and a density of <2.2g / cm 3 , bending strength over 150MPa, corrosion current density <0.016mA / cm 2 , volume conductivity up to 300S / cm, surface resistance <0.01Ωcm 2 , average gas transmission rate <2.0e‑6cm 3 / s cm 2 (ΔP=2 atm).

Description

technical field [0001] The invention relates to a method for preparing an ultrathin carbon / carbon composite bipolar plate. Background technique [0002] KPMG, a world-renowned consulting service company, conducted a survey on the future of the automotive industry in 2025 among thousands of executives and consumers in the global automotive industry in 2018. 52% of them believed that fuel cell vehicles will be the future of the automotive industry. ranked first. The proton exchange membrane fuel cell (PEMFC) as a power output unit is a key core component of a fuel cell vehicle. It is mainly composed of a bipolar plate, a GDL gas diffusion layer, and an MEA membrane electrode. Functions such as gas channels, current collection and supporting battery structure are one of the high-value core components of PEMFC. Therefore, how to reduce the cost of bipolar plates and improve the overall performance of bipolar plates has become the most critical issue in the industrialization of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0234H01M8/0245H01M8/0258
CPCH01M8/0234H01M8/0245H01M8/0258Y02E60/50
Inventor 李爱军朱界王大伟谢洪宾张久俊
Owner SHANGHAI UNIV