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Electroconductive porous body, solid polymer fuel cell, and method for manufacturing electroconductive porous body

A technology of porous bodies and conductive materials, which is applied in the manufacture of fuel cells, battery electrodes, conductive/antistatic filaments, etc., can solve problems such as difficulty in application, damage, and weak pressure resistance of carbon fibers, and achieve excellent electrode performance and conductivity Excellent, excellent adhesion effect

Inactive Publication Date: 2016-11-16
JAPAN VILENE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak pressure resistance of carbon fiber produced by such a method, it is difficult to apply to various purposes
For example, when a nonwoven fabric made of such carbon fibers is used as a base material for a gas diffusion electrode for a fuel cell, a membrane-electrode assembly is usually produced by a hot press, but due to the pressure of the hot press, And damaged, it is difficult to apply in practice

Method used

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  • Electroconductive porous body, solid polymer fuel cell, and method for manufacturing electroconductive porous body
  • Electroconductive porous body, solid polymer fuel cell, and method for manufacturing electroconductive porous body
  • Electroconductive porous body, solid polymer fuel cell, and method for manufacturing electroconductive porous body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] The first spinning solution was spun by an electrospinning method under the following conditions, and continuous precursor fibers were directly deposited on a stainless steel cylinder as a counter electrode to form a porous precursor fiber sheet in the form of a nonwoven fabric.

[0147] (Electrospinning conditions)

[0148] Electrode: metal nozzle (inner diameter: 0.33mm) and stainless steel cylinder

[0149] Injection amount: 2g / hour

[0150] The distance between the tip of the nozzle and the stainless steel cylinder: 10cm

[0151] Applied voltage: 10kV

[0152] Temperature / humidity: 25℃ / 35%RH

[0153] After that, solvent replacement was performed by immersing the precursor fibrous porous sheet in a water bath. Next, after removing moisture using a hot air drier set at 60°C, heat treatment was performed for 1 hour using a hot air drier set at 150°C to cure epoxy resin, which is a highly carbonizable organic material, to obtain The precursor fibers solidify the po...

Embodiment 2

[0159] In the same manner as in Example 1 except that the second spinning solution was used, a one-layer conductive porous sheet having a nonwoven fabric structure (mass per unit area: 67 g / m 2 , thickness: 193μm, porosity: 81%). In addition, conductive porous sheets such as Figure 5 , 6 As shown, CB is dispersed throughout including the interior, and only porous continuous fibrous materials (average fiber diameter: 2.6 μm, The mass ratio of the total amount of CB:EP carbide and THV carbide = 66:34, specific surface area: 443m 2 / g), and the fibrous materials are also combined with carbides of EP and THV. In addition, the physical properties of the conductive porous sheet are shown in Table 1.

Embodiment 3

[0185] The sixth spinning solution was spun by an electrospinning method under the following conditions, and continuous precursor fibers were directly accumulated on a stainless steel cylinder as a counter electrode to form a porous precursor fiber sheet in the form of a nonwoven fabric.

[0186] (Electrospinning conditions)

[0187] Electrode: metal nozzle (inner diameter: 0.33mm) and stainless steel cylinder

[0188] Injection amount: 4g / hour

[0189] The distance between the tip of the nozzle and the stainless steel barrel: 14cm

[0190] Applied voltage: 10kV

[0191] Temperature / humidity: 25℃ / 30%RH

[0192] Thereafter, heat treatment was performed for 1 hour using a hot air drier set at 150° C. to cure the epoxy resin, which is a highly carbonizable organic material, to obtain a precursor fiber-cured porous sheet.

[0193] After that, the precursor fiber-cured porous sheet was subjected to a carbonization and firing treatment (temperature increase rate: 10° C. / min) at ...

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Abstract

The present invention addresses the problem of providing: an electroconductive porous body that has a large specific surface area, that does not readily break under pressure, and that can be applied to a variety of applications; a solid polymer fuel cell; and a method for manufacturing an electroconductive porous body. This electroconductive porous body is obtained by aggregating a fibrous material having a first electroconductive material and a second electroconductive material that links spaces in the first electroconductive material, the electroconductive porous body having a specific surface area of 100 m2 / g or above, and a thickness retention rate of 60% or above after application of pressure at 2 MPa. Such an electroconductive porous body can be manufactured by spinning a spinning solution containing the first electroconductive material and a carbonizable organic material, forming a precursor fiber porous body in which precursor fibers are aggregated, and subsequently carbonizing the carbonizable organic material to obtain the second electroconductive material.

Description

technical field [0001] The invention relates to a conductive porous body, a solid polymer fuel cell and a preparation method of the conductive porous body. Background technique [0002] Conventionally, studies have been made on the use of conductive porous bodies as substrates for gas diffusion electrodes for fuel cells, electrodes for electric double layer capacitors, or electrodes for lithium ion rechargeable batteries by utilizing their conductivity and porosity. [0003] For example, International Publication No. 2011 / 089754 (Patent Document 1) discloses a specific surface area of ​​1 to 50m 2 / g carbon fiber non-woven fabric, but due to its small specific surface area, it cannot exhibit sufficient performance in various applications. For example, when used as an electrode of an electric double layer capacitor, it cannot increase electrostatic capacitance. [0004] In addition, JP-A-2010-530929 (Patent Document 2) discloses a method for producing carbon fibers, which h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/96H01M8/0234D04H1/4242D01D5/00D01F1/09D01F9/21D01F9/24
CPCD01D5/003D01F1/09D01F9/21D01F9/24D04H1/4242H01M4/8605H01M4/8807H01M4/96H01M8/0234H01M2008/1095Y02E60/50Y02P70/50D04H1/728D10B2101/12D10B2401/10
Inventor 伊藤达规多罗尾隆针谷佳织
Owner JAPAN VILENE CO LTD
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