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High-flux carbon paper for fuel cell and preparation method of high-flux carbon paper

A fuel cell, high-throughput technology, used in chemical instruments and methods, applications, household appliances, etc., can solve problems such as single structure design, inability to meet the requirements of high-throughput gas transmission and high drainage, and ignoring the performance requirements of carbon paper

Pending Publication Date: 2021-07-20
SHANGHAI JAZZ NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thin thickness of carbon paper, the existing carbon paper preparation process is mainly based on a single structure design, ignoring the performance requirements of different surfaces of carbon paper, and cannot meet the requirements of high-flux gas transmission and high displacement.
At present, the air permeability of commercially available carbon paper is 1800ml·mm / (cm 2 ·hr·mmAq), how to further improve the air permeability and drainage of carbon paper is an urgent problem to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of high-throughput carbon paper for fuel cells, the preparation method comprising the steps of:

[0021] (1) The carbon fiber is cut by a chopping machine, and cut into two kinds of lengths of 50mm and 5mm respectively, and the ratio is 1:2, and the chopped carbon fiber mixed with two lengths is opened by a double-roller fiber opener. Loose, using air as the dispersion medium, using high-speed rotating rollers to disperse the fiber raw materials into a single fiber state;

[0022] (2) The dispersed carbon fiber is introduced into the air-flow carding machine through the air-flow fiber feeder to form a web after carding;

[0023] (3) The carbon fiber mesh is coated with phenolic resin through the coating and dipping process, and then dried to form a surface density of 30g / cm 2 carbon fiber pre-impregnated paper;

[0024] (4) Taking the web forming direction as the reference direction, set the density of the second layer to 30g / m 2 The carbon fiber...

Embodiment 2

[0029] A preparation method of high-throughput carbon paper for fuel cells, the preparation method comprising the steps of:

[0030] (1) The carbon fiber is cut by a chopping machine, and the cutting length is 20 mm. The chopped carbon fiber is opened by a double-roller fiber opener, and the fiber raw material is cut by using air as a dispersion medium and a high-speed rotating roller. Dispersed into a single fiber state;

[0031] (2) The dispersed carbon fiber is introduced into the air-flow carding machine through the air-flow fiber feeder to form a web after carding;

[0032] (3) The carbon fiber mesh is coated with epoxy resin through the coating and dipping process, and then dried to form a surface density of 20g / cm 2 carbon fiber pre-impregnated paper;

[0033] (4) Taking the web forming direction as the reference direction, set the density of the 5 layers to 20g / m 2 The carbon fiber prepreg paper sheets are stacked layer by layer and then heat-pressed to form an inte...

Embodiment 3

[0038] A preparation method of high-throughput carbon paper for fuel cells, the preparation method comprising the steps of:

[0039] (1) The carbon fiber is cut with a chopping machine, and the lengths are cut to 20mm and 40mm respectively, and the chopped carbon fibers of different lengths are opened with a double-roller fiber opener, and the air is used as the dispersion medium, and the high-speed rotation is adopted. The rollers disperse the fiber raw materials of different lengths into a single fiber state;

[0040] (2) The dispersed carbon fibers are introduced into the air-flow carding machine through the air-flow fiber feeder to form a web after carding;

[0041] (3) Two kinds of carbon fiber webs with different chopped lengths were coated with vinyl resin by coating and dipping process, and then dried to form surface densities of 35 and 50 g / cm 2 carbon fiber pre-impregnated paper;

[0042] (4) Taking the netting direction as the reference direction, the density of t...

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Abstract

The invention discloses high-flux carbon paper for a fuel cell, which is characterized in that the thickness of the carbon fiber paper is 0.12-0.2 mm, the volume density is 0.25-0.40 g / cm3, the porosity is 78-85%, and the air permeability is greater than or equal to 2200ml*mm / (cm2.hr*mmAq); the surface resistivity is less than or equal to 100m [omega]cm; and the heat conductivity is greater than or equal to 1.5 W / (m.K). The invention also discloses a preparation scheme of the carbon fiber paper, wherein the carbon fiber paper is formed by superposing two to six layers of carbon fiber prepreg paper sheets layer by layer, continuously and integrally perforating and then carrying out high-temperature treatment. According to the invention, on the basis of the dry-method carbon paper, the regular perforation design is combined, so that a water vapor rapid channel in the thickness direction of the carbon paper is formed, a high-flux airflow channel is facilitated, and meanwhile, the transverse diffusion capability of irregular pore channels to water vapor is reserved.

Description

technical field [0001] The invention relates to the technical field of preparation of high-performance carbon fiber paper, in particular to a carbon paper suitable for fuel cells and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells have been widely used in the field of energy and energy-saving technologies due to their high energy conversion efficiency and no pollution. Carbon fiber paper is the matrix part of the gas diffusion layer of the core component of the fuel cell, and it is responsible for supporting the catalyst, ventilation and drainage, and the role of the current collector. With the high power requirements of fuel cells, the high flux of gas mass transfer is also required. Carbon paper is a porous medium, and the pore structure inside is discontinuous and irregular, which hinders high-flux gas transmission. In addition, the difference in interface pore structure between carbon paper, microporous layer and catalyti...

Claims

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Application Information

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IPC IPC(8): B32B9/00B32B9/04B32B37/06B32B37/10B32B38/08B32B38/04D04H1/4242D06N3/00
CPCB32B5/022B32B5/26B32B37/06B32B37/10B32B38/08B32B38/04D04H1/4242D06N3/0088B32B2038/047B32B2260/021B32B2260/046B32B2262/106B32B2457/18Y02E60/50
Inventor 卢雪峰
Owner SHANGHAI JAZZ NEW MATERIAL TECH CO LTD
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