Gas diffusion layer and method for the production thereof

Details Gas diffusion layer and method for the production thereof Gas diffusion layer and method for the production thereof

H - Electricity

01

M

H01M 8/00 (2006.01) H01M 8/02 (2006.01) H01M 4/96 (2006.01)

Patent

CA 2621335

Disclosed is a gas diffusion layer comprising a layer (2) that encompasses fibers (1). Said fibers (1) are provided in part with a coating material (3) while resting against each other at contact points (4). The layer (2) is fitted with boundary areas (5) that face the surroundings. In order to ensure optimal electrical conductivity, the inventive gas diffusion layer is characterized in that the fibers are free from coating material (3) at the contact points and/or the boundary areas. Also disclosed is a method for producing a gas diffusion layer, comprising a step in which the coating material (3) is removed in some areas and selectively from the fibers (1).

L'invention concerne une couche de diffusion gazeuse qui comprend une couche (2) comportant des fibres (1), ces fibres (1) étant recouvertes partiellement d'une matière de revêtement (3). Les fibres (1) se rejoignent au niveau de points de contact (4) et la couche (2) présente des surfaces limites (5) faisant face au milieu environnant. Selon l'invention, pour qu'une conductivité électrique optimale soit garantie, les fibres sont dépourvues de matière de revêtement (3) au niveau des points de contact et/ou des surfaces limites. L'invention concerne en outre un procédé de production d'une couche de diffusion gazeuse, ce procédé consistant notamment à éliminer la matière de revêtement (3) des fibres (1) de façon localisée et sélective.

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