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Graphite-based composite bipolar plate for fuel cell and preparation method thereof

A fuel cell and graphite-based technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of high production cost of pure graphite bipolar plates, inability to reduce the thickness of graphite plates, and low volume specific power density, etc., and achieve excellent Dimensional stability, improved volumetric power density, and excellent mechanical properties

Inactive Publication Date: 2021-07-09
江苏中氢氢电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production cost of pure graphite bipolar plates is high, and the mechanical properties are poor, so it is difficult to carry out industrial production.
Due to the poor mechanical properties of the graphite plate and the high cost of flow field processing, it is not suitable for use in mobile and transportation tools that require shock and vibration resistance and mass production. In addition, the thickness of the graphite plate cannot be reduced, resulting in a large fuel cell. Relatively bulky, low volume ratio power density

Method used

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  • Graphite-based composite bipolar plate for fuel cell and preparation method thereof

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Effect test

Embodiment 1

[0028] A method for preparing a graphite-based composite bipolar plate for a fuel cell, comprising the following steps:

[0029] Preparation of Carbon Nanotubes Modified by Carboxylation Reaction

[0030] Put 30g of multi-walled carbon nanotubes and 1000mL of nitric acid into a four-necked beaker, carry out acid treatment at 130°C for 10 hours, remove the acid-treated carbon nanotubes from the four-necked beaker, and put them into a vacuum filtration equipment for use Tetrahydrofuran was filtered and washed with suction. After cleaning, dry to constant weight in a vacuum dryer at 100° C. to obtain carbon nanotubes modified by carboxylation reaction, hereinafter referred to as carboxylated carbon nanotubes.

[0031] Fabrication of graphite-based composite bipolar plates

[0032] (1) 300g bisphenol A type epoxy methacrylate vinyl ester resin, polystyrene resin (low shrinkage agent) diluted with 15g styrene, 15g styrene monomer, 3g free radical initiator benzene peroxide tert-...

Embodiment 2

[0036] A method for preparing a graphite-based composite bipolar plate for a fuel cell, comprising the following steps:

[0037] Preparation of Carbon Nanotubes Modified by Carboxylation Reaction

[0038] Put 30g of multi-walled carbon nanotubes and 1000mL of nitric acid into a four-necked beaker, carry out acid treatment at 120°C for 8 hours, remove the acid-treated carbon nanotubes from the four-necked beaker, and put them into a vacuum filtration equipment for use Tetrahydrofuran was filtered and washed with suction. After cleaning, dry to constant weight in a vacuum dryer at 100° C. to obtain carbon nanotubes modified by carboxylation reaction, hereinafter referred to as carboxylated carbon nanotubes.

[0039] Fabrication of graphite-based composite bipolar plates

[0040] (1) Polystyrene resin (low shrinkage agent) diluted with 300g glycidyl ester epoxy resin, 20g styrene, 25g styrene monomer, 8g free radical initiator tert-butyl peroxybenzoate, 20g thickening Calcium ...

Embodiment 3

[0044] A method for preparing a graphite-based composite bipolar plate for a fuel cell, comprising the following steps:

[0045] Preparation of Carbon Nanotubes Modified by Carboxylation Reaction

[0046] Put 30g of multi-walled carbon nanotubes and 1000mL of sulfuric acid into a four-necked beaker, and perform acid treatment at 100°C for 12 hours, remove the acid-treated carbon nanotubes from the four-necked beaker, and put them in a vacuum filtration equipment Suction filter and wash with tetrahydrofuran. After cleaning, dry to constant weight in a vacuum dryer at 100° C. to obtain carbon nanotubes modified by carboxylation reaction, hereinafter referred to as carboxylated carbon nanotubes.

[0047] Fabrication of graphite-based composite bipolar plates

[0048] (1) Polystyrene resin (low shrinkage agent) diluted with 300g glycidylamine epoxy resin, 25g styrene, 28g styrene monomer, 10g free radical initiator perbenzoate, 20g thickener polyisocyanate , 10g of zinc stearat...

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Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to a graphite-based composite bipolar plate for a fuel cell and a preparation method of the graphite-based composite bipolar plate. The preparation method of the graphite-based composite bipolar plate comprises the following steps: (a) mixing prepared thermosetting resin slurry and graphite powder to form a blocky molding compound, and adding modified carbon nanotubes accounting for 0.1%-10% of the total weight of the graphite powder and the thermosetting resin slurry in the mixing process; and (b) carrying out mold pressing on the blocky molding compound obtained in the step (a) at 50-300 DEG C and 5-35 MPa for 0.5-5 min to obtain the graphite-based composite bipolar plate for the fuel cell. The carboxylation reaction modified carbon nanotubes are used in the preparation of the graphite-based composite bipolar plate, and the prepared graphite-based composite bipolar plate has the advantages of high conductivity, high corrosion resistance, excellent mechanical properties, ultra-thin thickness, excellent dimensional stability, high thermal stability and the like; and the volume power density and the safety of the fuel cell can be improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a graphite-based composite bipolar plate for a fuel cell and a preparation method thereof. Background technique [0002] As a key component of the proton exchange membrane fuel cell, the bipolar plate conducts current transmission in the fuel cell stack, and transports gas and drainage. The bipolar plate materials currently studied are mainly divided into three categories: pure graphite bipolar plates, metal bipolar plates (coated, uncoated) and graphite-based composite bipolar plates. [0003] Graphite is an earlier material used to develop and make bipolar plates. Traditional pure graphite bipolar plates mainly use non-porous graphite plates, which have excellent corrosion resistance, good chemical stability, high thermal conductivity and electrical conductivity. Rate. However, the production cost of pure graphite bipolar plates is high, and the mechanical prop...

Claims

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Application Information

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IPC IPC(8): H01M8/0226H01M8/0213H01M8/0221
CPCH01M8/0213H01M8/0221H01M8/0226Y02E60/50
Inventor 林纪峰袁佳林
Owner 江苏中氢氢电科技有限公司
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