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Geo polymer base composite material double pole plate and its preparing method

A composite material and geopolymer technology, used in fuel cells, battery electrodes, fuel cell components, etc., can solve the problems of immature composite bipolar plate technology, low mechanical strength and bending strength, and metal bipolar plate density. Large and other problems, to achieve the effect of light weight, good electrical conductivity and low production cost

Inactive Publication Date: 2007-10-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are mainly three kinds of bipolar plate materials: graphite bipolar plate, metal bipolar plate and composite material bipolar plate, but they all have obvious defects: graphite materials have low mechanical strength (especially bending strength), high brittleness, Difficult to thin sheet, poor air tightness, and high processing cost (the processing cost accounts for more than 50% of the total cost); the metal bipolar plate has a high density and is easy to corrode; the technology of composite bipolar plate is still immature, and the cost also high

Method used

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  • Geo polymer base composite material double pole plate and its preparing method
  • Geo polymer base composite material double pole plate and its preparing method
  • Geo polymer base composite material double pole plate and its preparing method

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Effect test

Embodiment 1

[0064] A method for preparing a geopolymer-based composite bipolar plate, comprising the steps of:

[0065] 1) Select 4 groups of raw materials (number 1-4) according to Table 7. The metakaolin is commercially available coal series kaolin or pure kaolin, which is calcined at a high temperature of 600-850°C. The purity of the graphite is more than or equal to 99.85 wt%, and the fineness is less than 90 μm. The length of the carbon fiber is less than 4mm, and the diameter is less than 0.2mm.

[0066] 2) Fully stir the metakaolin and the conductive material with a JJ-5 cement mortar mixer, and mix evenly to obtain a powder; add the water glass solution to the uniformly mixed powder, and then fully stir to obtain a slurry;

[0067] 3) After the slurry is fully stirred by the JJ-5 cement mortar mixer, it is injected into a metal mold (bipolar plate forming mold) with a reverse gas flow channel, hot-pressed at 120-180°C for 15 minutes, and demolded. After demoulding, put it under...

Embodiment 2

[0074] A method for preparing a geopolymer-based composite bipolar plate, comprising the steps of:

[0075] 1) According to Table 9, select 12 groups of raw materials (serial numbers 1-12, correspondingly make 12 bipolar plates). The metakaolin is commercially available coal series kaolin or pure kaolin, which is calcined at a high temperature of 600-850°C. The purity of the graphite is more than or equal to 99.85 wt%, and the fineness is less than 90 μm. The length of the carbon fiber is less than 4mm, and the diameter is less than 0.2mm.

[0076] 2) Fully stir the metakaolin and the conductive material with a JJ-5 cement mortar mixer, and mix evenly to obtain a powder; add the water glass solution to the uniformly mixed powder, and then fully stir to obtain a slurry;

[0077] 3) After the slurry is fully stirred by the JJ-5 cement mortar mixer, it is injected into a metal mold with a reverse gas flow channel (the bipolar plate forming is implemented according to the existi...

Embodiment 3

[0081] A method for preparing a geopolymer-based composite bipolar plate, comprising the steps of:

[0082] 1) According to graphite dosage is 20% of metakaolin quality, and carbon fiber dosage is 10% of metakaolin quality; The mass ratio of water glass solution and metakaolin and conductive material is 0.4: 1 selects metakaolin, graphite, carbon fiber and water The raw material of glass solution, wherein the conductive material is composed of graphite and carbon fiber; the metakaolin is obtained by calcining coal series kaolin sold on the market at a high temperature of 600°C; the modulus of the water glass solution is m=2.8, Baumé Be=35; the purity of the graphite is ≥99.85wt%, and the fineness is less than 90 μm; the length of the carbon fiber is less than 4mm, and the diameter is less than 0.2mm;

[0083] 2) Fully stir the metakaolin and the conductive material with a JJ-5 cement mortar mixer, and mix evenly to obtain a powder; add the water glass solution to the uniformly...

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Abstract

Characters of bipolar plate of polymer based composite material are that it is produced from materials of Meta kaolin, conductance material, and solution of water glass. The conductance material is composed of graphite and carbon fiber. Doping quantity of graphite is 20-40% of mass of meta kaolin, and doping quantity of carbon fiber is 10-20%. Mass ratio between solution of water glass, meta kaolin, and conductance material 0.4-0.8:1. The said Meta kaolin is obtained by calcinating kaolin in coal series sold on market or pure kaolin at 600-850 deg.C. Modulus m of solution of water glass is equal to 2.8-3.5, and Baume degree is equal to 35-45. Features of the bipolar plate are: low cost, good corrosion resistance, high mechanical strength, light weight, good conductivity, no poison and pollution on fuel cell of proton exchange membrane.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell bipolar plate and a preparation method thereof. Background technique [0002] Due to its high energy conversion efficiency, environmental friendliness, stable performance, and clean production, proton exchange membrane fuel cells (PEMFC) have broad application prospects in vehicle drive power supplies, portable power supplies, and household power stations. an important direction of development. [0003] However, the high cost is the main reason why PEMFC is currently difficult to commercialize. Among them, the bipolar plate accounts for about 70% to 80% of the total mass of the entire PEMFC, and the cost accounts for about 40% to 50% of the total cost. At present, there are mainly three kinds of bipolar plate materials: graphite bipolar plate, metal bipolar plate and composite material bipolar plate, but they all have obvious defects: graphite materials have low mechanical strength (especi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/0226H01M8/1004
CPCY02E60/50
Inventor 王发洲沈春晖张云升丁庆军胡曙光
Owner WUHAN UNIV OF TECH
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