A kind of preparation method of graphene monopolar plate with high electrical conductivity, high thermal conductivity, high air tightness and corrosion resistance and hydrogen fuel cell

A fuel cell and graphene technology, applied in fuel cells, electrical components, battery electrodes, etc., can solve the problems of low hydrogen utilization rate, low electrical conductivity, and low thermal conductivity of bipolar plates, and achieve high crystallinity and electrical conductivity Effects of improved performance and excellent chemical stability

Active Publication Date: 2021-09-17
山东国烯新材料创新中心有限公司
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Problems solved by technology

[0004] In order to solve the problems of low thermal conductivity, low electrical conductivity, and low hydrogen utilization rate of the above-mentioned hydrogen fuel cell bipolar plate, the present invention provides a method for preparing a high-conductivity, high-thermal-conductivity, high-air-tightness and corrosion-resistant graphene monopolar plate and hydrogen fuel cells

Method used

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  • A kind of preparation method of graphene monopolar plate with high electrical conductivity, high thermal conductivity, high air tightness and corrosion resistance and hydrogen fuel cell
  • A kind of preparation method of graphene monopolar plate with high electrical conductivity, high thermal conductivity, high air tightness and corrosion resistance and hydrogen fuel cell
  • A kind of preparation method of graphene monopolar plate with high electrical conductivity, high thermal conductivity, high air tightness and corrosion resistance and hydrogen fuel cell

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specific Embodiment approach 1

[0027] Specific embodiment one: what this embodiment records is a kind of preparation method of high electrical conductivity, high thermal conductivity, high air tightness and corrosion-resistant graphene unipolar plate, and the steps of the method are as follows:

[0028] Step 1: Mold preparation: Prepare the corresponding graphite mold according to the shape and size of the unipolar plate, and the graphite is high-strength graphite;

[0029] Step 2: Filling: spread the graphene powder evenly in the graphite mold, and scrape the surface;

[0030] Step 3: Preforming: Use a press to apply a pressure of 0.5~1MPa to the filler in step 2 at room temperature, pressurize at a constant speed of 5~20mm / min, and keep the pressure for 1~5min after reaching the given pressure Preformed into a graphene plate and taken out from the mold; the preforming process can discharge most of the gas inside the powder, and during the process of gas discharge, the flow of the gas can drive the graphen...

specific Embodiment approach 2

[0034] Specific embodiment two: the preparation method of a kind of high electrical conductivity, high thermal conductivity, high air-tightness and corrosion-resistant graphene unipolar plate described in specific embodiment one, in step five, described hot pressing sintering is: from room temperature to 8 ~ The heating rate of 20 ℃ / min is raised to 600 ℃ ~ 2500 ℃, pressurized, the pressure is 20MPa ~ 60MPa, the heat preservation and pressure holding time is 30 ~ 120min, the whole hot pressing sintering process is carried out in a vacuum environment or an inert atmosphere.

specific Embodiment approach 3

[0035] Specific embodiment three: the preparation method of a high-conductivity, high-thermal-conductivity, high-air-tightness and corrosion-resistant graphene monopolar plate described in specific embodiment one, inside the graphene bipolar plate, graphene is along the plane direction (XY direction) Highly directional arrangement.

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Abstract

The invention mainly relates to a preparation method of a graphene monopolar plate with high electrical conductivity, high thermal conductivity, high air tightness and corrosion resistance. The invention aims to solve the problems of poor electrical and thermal conductivity, poor air tightness and poor corrosion resistance of traditional bipolar plates. Method: Graphite mold preparation, filler (few-layer graphene powder), preforming into a plate shape, pre-sintering to remove the dispersant, in-situ densification molding, mechanical processing to the finished product, and bipolar plate assembly. The invention also discloses a fuel cell comprising such a bipolar plate. The thermal conductivity and electrical conductivity of the bipolar plate of the present invention are an order of magnitude higher than that of the traditional bipolar plate, and at the same time have very high air tightness and excellent corrosion resistance, thereby improving the energy conversion efficiency and service life of hydrogen fuel cells And use safety, expanding the application range of hydrogen fuel cells.

Description

technical field [0001] The invention belongs to the technical field of hydrogen fuel cell material preparation, and in particular relates to a method for preparing a high-conductivity, high-thermal-conductivity, high-air-tightness and corrosion-resistant graphene monopolar plate and a hydrogen fuel cell. Background technique [0002] In the environment of increasingly high environmental protection requirements, fuel cells have gradually attracted the attention of academia and industry due to their advantages such as high power generation efficiency and no environmental pollution, and have been applied in aerospace, electric vehicles and other fields. It has broad application prospects. The core component of a hydrogen fuel cell is the bipolar plate. A bipolar plate is composed of two electrode plates with a proton exchange membrane sandwiched between them. Among them, the electrode plate plays the role of supporting the oxidizing agent and reducing agent and guiding the fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/96H01M8/0234
CPCY02E60/50Y02P70/50
Inventor 李宜彬
Owner 山东国烯新材料创新中心有限公司
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