Porous electrode substrate and manufacturing method thereof, film-electrode combination and solid high-polymer fuel cell

A technology of electrode substrate and manufacturing method, applied in solid electrolyte fuel cells, battery electrodes, final product manufacturing, etc., can solve problems such as flooding, increased condensation, etc., and achieve the effect of low apparent thermal diffusivity

Active Publication Date: 2015-04-22
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with this porous electrode substrate, there is a problem that water flooding may occur if water condensation increases in a high current density region under high humidification conditions.

Method used

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  • Porous electrode substrate and manufacturing method thereof, film-electrode combination and solid high-polymer fuel cell
  • Porous electrode substrate and manufacturing method thereof, film-electrode combination and solid high-polymer fuel cell
  • Porous electrode substrate and manufacturing method thereof, film-electrode combination and solid high-polymer fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Short fiber bundles of polyacrylonitrile (PAN)-based carbon fibers having an average fiber diameter of 7 μm and an average fiber length of 3 mm were uniformly dispersed in water in a slurry tank of a wet-type short-wire continuous papermaking device to be opened. When the short carbon fibers are sufficiently dispersed, short fibers of polyvinyl alcohol (PVA) (manufactured by Kuraray Co., Ltd., trade name: VBP105-1, cut length 3mm) as a binder are uniformly dispersed and fibrils The polyethylene pulp (manufactured by Mitsui Chemicals, Inc., trade name: SWP, freeness: 450 ml) was sent out at 18% by mass and 77% by mass relative to short carbon fibers. Make the sent web pass through the short mesh plate, and dry it with a desiccant to obtain a gram weight (flat weight) of 43g / m2 , carbon fiber paper A with a length of 100m.

[0118] Next, the carbon precursor fiber resin was attached to the carbon fiber paper A by a kiss coat method. Specifically, the carbon fiber paper A...

Embodiment 2

[0122] A porous electrode substrate was obtained in the same manner as in Example 1, except that the temperature for heating in a nitrogen atmosphere for 5 minutes was set to 1450° C. in the carbonization treatment performed in a continuous firing furnace. Table 1 shows the evaluation results of the obtained porous electrode substrates.

Embodiment 3

[0124] A porous electrode substrate was obtained in the same manner as in Example 1, except that the temperature for heating in a nitrogen atmosphere for 5 minutes was set to 1100° C. in the carbonization treatment performed in a continuous firing furnace. Table 1 shows the evaluation results of the obtained porous electrode substrates.

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Abstract

The present invention provides a porous electrode substrate and a manufacturing method thereof, a film-electrode combination with the substrate and a solid high-polymer fuel cell. The invention provides the porous electrode substrate with the advantages of low thermal diffusion coefficient in a thickness direction and high flooding resistance at high moisture state or high current density area, and the film-electrode combination with the substrate, and the solid high-polymer fuel cell. The porous electrode substrate is prepared through the method which comprises the following steps: a step of obtaining a piece of carbon fiber paper which is adhered with the resin and is obtained through causing carbon precursor resin to adhere with the carbon fiber paper that comprises the planar scattered short carbon fibers with an average fiber diameter of 3-9 mu m and original fiber-shaped object; a step of performing hot pressing and solidifying the carbon fiber paper which is adhered with resin for obtaining an intermediate substrate; and heating the intermediate substrate with a maximum temperature of 1000-1800 DEG C and carbonizing the carbon precursor resin.

Description

technical field [0001] The present invention relates to a porous electrode base material used in a solid polymer fuel cell, a method for producing the same, a membrane-electrode assembly using the base material, a solid polymer fuel cell, and the like. Background technique [0002] As a porous electrode substrate for a solid polymer fuel cell, a substrate in which short carbon fibers are bound together by resin carbide is used. Porous electrode substrates are generally produced by making a sheet-like intermediate substrate from a mixture of short carbon fibers and a sheeting medium containing an organic binder such as polyvinyl alcohol, and then heating the intermediate substrate. A resin that may be carbonized at times, for example, a resol-type phenolic resin that is a thermosetting resin is attached, and the intermediate base material to which the resin is attached is further heated to be carbonized. [0003] One of the important functions of the porous electrode substra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/86H01M8/10
CPCY02E60/521Y02E60/50Y02P70/50
Inventor 龙野宏人隅冈和宏
Owner MITSUBISHI CHEM CORP
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