Porous, electrically conductive sheet and method for production thereof

A porous conductive, sheet technology, applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve problems such as large thickness variation, large fiber bundle gaps and non-uniformity, etc.

Inactive Publication Date: 2002-02-27
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, the thickness varies greatly with pressurization, and the gaps and unevenness between fiber bundles are large
So, there arises a problem that it is difficult to handle in subsequent steps such as catalyst coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Short PAN carbon fibers with a fiber diameter of 7 μm and cut into 12 mm lengths were dispersed in water and scooped onto a wire cloth. The sheet composed of short carbon fibers thus obtained was impregnated with an emulsion composed of a mixture of PVA and PVAc (mixing ratio 1:3), and dried to obtain a porous conductive sheet.

[0104] Then, the resulting porous conductive sheet was impregnated with a solution obtained by dispersing Ketjen Black powder (EC600JD, manufactured by Lion Corporation) in water containing dissolved PVA, and dried to remove water to obtain a porous conductive sheet. The unit weight of gained porous conductive sheet is 42 grams / meter 2 , Ketjen Black content is 22%, PVA and PVAc content is 23%.

Embodiment 2

[0112] The porous conductive sheet of Comparative Example 3 was pressurized in the thickness direction under a surface pressure of 2.9 MPa and the pressure was released to obtain a porous conductive sheet.

Embodiment 3

[0114] The porous conductive sheet of comparative example 3 is impregnated with PFA dispersion (AD-2CR, produced by Daikin Industry Co., Ltd.), dried, and kept between two graphite plates at 35 g / cm 2 Pressing under the surface pressure and simultaneously heat-treating at a temperature of 350° C. for 1 hour to obtain a porous conductive sheet. The unit weight of the porous conductive sheet is 55 g / m 2 , the PFA content is 11%.

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Abstract

A porous, electrically conductive sheet, which (a) comprises a sheet formed with a number of carbon fibers having an organic substance adhered thereto, (b) has an electrical resistance in the direction of thickness of 50 m OMEGA cm<2> or less, (c) has a maximum diameter for causing fracture of 25 mm or less, and (d) has a compression ratio (the ratio of a thickness of a compressed sheet to that of an original sheet) of 40 % or less. The porous, electrically conductive sheet can be produced by a method comprising (a) a sheet-forming step of scooping a number of carbon fibers being dispersed in a liquid up onto a net to thereby form a carbon fiber sheet, (b) an organic substance adhesion step of rendering an organic substance to adhere to the formed carbon fiber sheet as a binder for carbon fibers, (c) a drying step of drying the sheet having the organic substance adhered thereto, and (d) a pressing step of pressing the dried sheet with a face pressure of 0.49 to 9.8 Mpa and/or of subjecting the sheet to a roll pressing with a clearance of 300 mu m or less.

Description

field of invention [0001] The present invention relates to a porous conductive sheet, which is required to have preferred fluid permeability and conductivity, and is used as an electrode substrate of a polymer electrolyte fuel cell or an electrolytic cell. The invention also relates to its preparation method. Background technique [0002] Electrode substrates for fuel cells or electrolyzers need to have permeability to the fluids involved in the reaction, such as hydrogen, oxygen, and water, as well as electrical conductivity. In addition, during the formation of the electrode base material, the porous conductive sheet used to constitute the base material needs to have strength to withstand molding processing. [0003] As such a porous conductive sheet for forming an electrode base material, a porous carbon plate containing short carbon fibers bonded to carbon is proposed in JP 06-020710A, JP 07-326362 A or JP 07-220735 A. [0004] However, this porous carbon plate has a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/50H01B1/24H01M4/96
CPCH01M4/96D21H13/50H01B1/24Y02E60/50
Inventor 井上干夫中江武次
Owner TORAY IND INC
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