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Sheet, electrode and fuel cell

Inactive Publication Date: 2015-03-11
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing commercial products have problems such as difficulty in molding by paste extrusion, etc., or too low conductivity for use in electrodes, etc.
However, although this method has high conductivity in the rolling direction, it has the following problems: the volume resistivity is nearly an order of magnitude higher in the thickness direction of the sheet, and the conductivity is poor.
However, this electrode has the problem of high cost of carbon fibers in addition to the problems of easy cracking and poor load resistance.

Method used

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  • Sheet, electrode and fuel cell
  • Sheet, electrode and fuel cell
  • Sheet, electrode and fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] 1620 g of water, carbon black 3030B manufactured by Mitsubishi Chemical Corporation (DBP oil absorption 130 cm 3 / 100g, average particle size 55nm) 144g and 36g of graphite BF-3AK (flaky graphite, average particle size 3 μm) manufactured by Chuetsu Graphite Industry Co., Ltd. were stirred to prepare an aqueous dispersion. 720 g of a PTFE aqueous dispersion containing 2.16 polytetrafluoroethylene (PTFE (modified amount: 0.00% by mass)) with a resin component of 25% by mass was added to the aqueous dispersion and stirred to coagulate the PTFE. Then, the condensate was placed in a drying oven at 180° C. for 10 hours to evaporate water, thereby producing a mixed powder.

[0122] 193 g of a hydrocarbon-based solvent Isopar G manufactured by ExxonMobil Corporation as an extrusion aid for paste extrusion molding was mixed with 350 g of the mixed powder, and aged for 10 hours. The additive mixed powder is preformed, using Barrel, Mandrel, mold inner diameter Extruded by ...

Embodiment 2～5

[0124] As shown in Table 1, except that the ratio (mass %) of PTFE (modified amount 0.00 mass %), carbon black and graphite was changed, a conductive sheet with a thickness of 100 μm was produced under the same conditions as in Example 1, and the resistance was measured. value. The results are shown in Table 1.

Embodiment 6

[0128] Change carbon black to average particle size 30nm, DBP oil absorption 115cm 3 / 100g of carbon black, except that a conductive sheet with a thickness of 100 μm was produced under the same conditions as in Example 1, and the resistance value was measured, and it was 0.15Ω.

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Abstract

The purpose of the present invention is to provide: a sheet which exhibits high thicknesswise conductivity and excellent gas permeability, water repellency, corrosion resistance and flexibility and which is suitable for use in an electrode of a fuel cell or the like; an electrode; and a fuel cell. The present invention is a sheet which comprises a polytetrafluoroethylene, carbon black and graphite and which is characterized in that: the polytetrafluoroethylene has a standard specific gravity of 2.14 to 2.28; and the total amount of the carbon black and the graphite exceeds 35 mass% of the total amount of the polytetrafluoroethylene, the carbon black and the graphite.

Description

technical field [0001] The invention relates to sheets, electrodes and fuel cells. More specifically, the present invention relates to a sheet suitable for fuel cell electrodes, an electrode formed from the sheet, and a fuel cell having the electrode. Background technique [0002] A fuel cell generally has a membrane-electrode assembly (MEA) composed of an anode and a cathode electrode that undergo a reaction that functions to generate electricity, and an electrolyte membrane that serves as an ion conductor between the anode and the cathode. The MEA is sandwiched by separators. The compartments are constructed as units. Here, the electrode consists of an electrode base material (also called a gas diffusion electrode or a current collector) that promotes gas diffusion and collects (supplies) electricity, and an electrode catalyst layer that actually becomes an electrochemical reaction field. For example, in the anode of a solid polymer fuel cell, fuel such as hydrogen react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96C08J3/20C08J5/18C08K3/04C08K7/00H01B1/24H01M8/10
CPCH01M4/96H01M2008/1095H01M8/0234C08J5/18H01B1/24C08J3/20H01M8/0243C08K2201/014H01M8/0239Y02E60/50C08J2327/18C08K3/04C08L27/18H01M4/8673
Inventor 吉本洋之茶圆伸一河原一也涉谷吉之助川胜通
Owner DAIKIN IND LTD