Method for preparing carbon paper of gas diffusion layer of fuel cell by calendaring and carbon paper

A gas diffusion layer and fuel cell technology, applied in fuel cells, electrical components, battery electrodes, etc., can solve problems such as low porosity, and achieve the effects of high porosity, large pore volume, excellent conductivity and stability

Active Publication Date: 2020-05-19
上海中海龙高新技术研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problem of low porosity in the current large-scale use of thermoplastic molding to prepare fuel cell gas diffusion layer carbon paper, the present invention proposes a method for preparing fuel cell gas diffusion layer carbon paper and carbon paper by calendering, thereby effectively improving the gas diffusion layer. The porosity of carbon paper improves gas diffusion properties

Method used

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  • Method for preparing carbon paper of gas diffusion layer of fuel cell by calendaring and carbon paper
  • Method for preparing carbon paper of gas diffusion layer of fuel cell by calendaring and carbon paper

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Embodiment 1

[0037] (1) Immerse the microporous conductive carbon in a saturated salt solution for 1.5 hours, so that the microporous conductive carbon fully absorbs the salt solution, then filter out the excess liquid salt solution, and dry it so that the salt occupies the gaps in the microporous conductive carbon to obtain the pre- The treated microporous conductive carbon; the microporous conductive carbon is conductive carbon black with micropores; the saturated salt solution is a saturated solution composed of sodium chloride and ammonium sulfate;

[0038] (2) Disperse the pretreated microporous conductive carbon with soluble salt particles, hot-melt polymers, and fiber materials evenly, then add the mixed materials into the mixer for thermal mixing, and then calender through the calender, one-way Stretching, and finally needling roller treatment, to obtain a thin sheet with through micropores and an average thickness of 0.26mm; the soluble salt particles are sodium chloride particles;...

Embodiment 2

[0043] (1) Immerse the microporous conductive carbon in a saturated salt solution for 1 hour, so that the microporous conductive carbon fully absorbs the salt solution, then filter out the excess liquid salt solution, and dry it so that the salt occupies the gaps in the microporous conductive carbon to obtain pretreatment The microporous conductive carbon; the microporous conductive carbon is a graphene airgel with micropores; the saturated salt solution is a saturated solution composed of sodium chloride and ammonium phosphate;

[0044] (2) Disperse the pretreated microporous conductive carbon with soluble salt particles, hot-melt polymers, and fiber materials evenly, then add the mixed materials into the mixer for thermal mixing, and then calender through the calender, one-way Stretching, and finally needling roller treatment, to obtain a thin sheet with through pores and an average thickness of 0.2mm; the soluble salt particles are sodium sulfate particles; the hot-melt poly...

Embodiment 3

[0048] (1) Immerse the microporous conductive carbon in a saturated salt solution for 2 hours, so that the microporous conductive carbon fully absorbs the salt solution, then filter out the excess liquid salt solution, and dry it so that the salt occupies the gaps in the microporous conductive carbon to obtain pretreatment The microporous conductive carbon; the microporous conductive carbon is a carbon fiber ball with micropores; the saturated salt solution is a saturated solution of sodium sulfate and ammonium sulfate;

[0049] (2) Disperse the pretreated microporous conductive carbon with soluble salt particles, hot-melt polymers, and fiber materials evenly, then add the mixed materials into the mixer for thermal mixing, and then calender through the calender, one-way Stretching, and finally needling roller treatment, to obtain a thin sheet with through pores and an average thickness of 0.3mm; the soluble salt particles are sodium chloride particles; the hot-melt polymer is p...

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Abstract

The invention provides a method for preparing carbon paper of a gas diffusion layer of a fuel cell by calendaring and the carbon paper. The carbon paper of the gas diffusion layer is prepared by the following steps of uniformly dispersing micropore conductive carbon fully infiltrated with a saturated salt solution, soluble salt particles, a hot-melt polymer and a fiber material, mixing, calendaring and stretching, and processing by a needle roller to obtain a thin sheet; and continuously passing the thin sheet through a guide roller in a solvent pool, leading out and drying the thin sheet, then leading the thin sheet into a clean water pool, and finally leading out and drying, trimming and coiling the thin sheet. According to the method, the conductive carbon material pre-occupying the soluble salt in the gaps and the soluble salt particles are dispersed in the polymer and then are subjected to hot calendering molding, small gaps of the carbon particles and macropores of the soluble salt particles after dissolution exist synergistically after washing desalination, needling treatment is further carried out, and finally infiltration and cold stretching are carried out in the solventpool, so that the carbon paper with high porosity is obtained. In addition, the preparation process is simple, the cost is low, and large-scale production is easy.

Description

technical field [0001] The invention relates to the technical field of the fuel cell gas diffusion layer, in particular to a method for calendering and preparing carbon paper for the fuel cell gas diffusion layer and the carbon paper. Background technique [0002] Proton exchange membrane fuel cell has the characteristics of high energy efficiency, clean and pollution-free, and has become a research and development hotspot in various countries in recent years. Its core component, the three-in-one membrane electrode (MEA), is usually prepared by a hot-pressing process from a gas diffusion layer, a catalytic layer and a proton exchange membrane. The gas diffusion layer is composed of a conductive porous material, which plays multiple roles such as supporting the catalytic layer, collecting current, conducting gas, and discharging water. One of the key components of performance. [0003] The gas diffusion layer is usually composed of a base layer and a microporous layer. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C43/24B29C55/02B29C59/04B29C71/00H01M4/88H01M8/1004B29L7/00
CPCB29C43/24B29C55/02B29C59/04B29C69/02B29C71/0009B29C2071/0045B29L2007/00H01M4/8807H01M8/1004Y02E60/50Y02P70/50
Inventor 曾军堂陈庆何方陈涛
Owner 上海中海龙高新技术研究院
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