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A conducting material and preparation method and use thereof

A technology of conductive materials and polymers, used in conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problems of complex manufacturing process, poor conductivity and high cost

Inactive Publication Date: 2011-03-16
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current graphite-based composite bipolar plates still have problems such as poor electrical conductivity, low strength, easy air permeability, poor stability, complex manufacturing process, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The method for preparing the conductive material provided by the present invention is obtained by hot pressing a mixture formed by mixing graphite and a polymer binder.

[0025] The mixture formed by mixing graphite and polymer binder is a particle / powder with a particle size of 1-100 μm. It can be obtained by mixing graphite and polymer in a conventional manner in the art, or can be obtained by mixing graphite and polymer in a conventional manner in the art. Graphite particles / powder obtained by milling are mixed with polymer particles / powder. The polymer binder is mesophase pitch and / or polyarylacetylene.

[0026] The said hot-press forming conditions are heating to 80-320°C under a pressure of 5-40Mpa, and heat preservation for 0.1-3 hours.

[0027] In a preferred embodiment of the present invention, the conductive material provided by the present invention is prepared by the following steps:

[0028] (1) Weigh graphite, mesophase pitch and polyarylacetylene, put them into ...

Embodiment 1

[0040] Solid material composition: 1 part of graphite, 0.5 part of mesophase pitch, 0.5 part of polyarylacetylene; dry blending by ball mill, speed 400rpm, time 5h; hot pressing pressure 25Mpa, temperature 250℃, heat preservation 1.5h.

[0041] The resulting bipolar plate has a thickness of 1.5mm and a density of 1.73g / cm 3 , Conductivity 132S / cm, bending strength 78.2Mpa, air permeability 2×10 -7 cm 3 / (cm 2 ·S).

Embodiment 2

[0043] Solid material composition: 1 part of graphite, 0.5 part of mesophase pitch; dry blending by ball mill, speed 400rpm, time 4h; hot pressing pressure 25Mpa, temperature 320℃, heat preservation 1h.

[0044] The resulting bipolar plate has a thickness of 1.5mm and a density of 1.85g / cm 3 , Electrical conductivity 157S / cm, bending strength 69.4Mpa, air permeability 6×10 -7 cm 3 / (cm 2 ·S).

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Abstract

The invention discloses a conducting material and preparation method and use thereof. The conducting material provided by the invention is composed of a graphite and a polymer, and the polymer is a mesophase pitch, and / or a polyarylacetylene; weight ratio of the graphite to the polymer is in a range from 1 : 0.05 to 1 : 5, and the conducting material is particularly suitable for a fuel battery system.

Description

Technical field [0001] The present invention relates to fuel cell neighborhoods, in particular to conductive materials that can be used as fuel cell bipolar plates and a preparation method thereof. Background technique [0002] Fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy by means of electrochemical reaction. It is a new technology that uses energy efficiently without polluting the environment. The fuel cell is composed of many single cells, and each single cell is usually composed of three parts: membrane electrode, diffusion layer and bipolar plate. The bipolar plate is a key component to connect single fuel cells in series to form a stack. One side of it is in contact with the anode of a single cell, and the other side is in contact with the cathode of the adjacent single cell. Its function is to separate the gas and pass through the flow field. The reaction gas is introduced into the fuel cell to collect and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/24H01B13/00H01M4/86
CPCY02E60/50
Inventor 李平张世渊吴一宁徐晶韩一帆周兴贵
Owner EAST CHINA UNIV OF SCI & TECH