Amine oxide coating compositions

H - Electricity – 01 – M

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H01M 8/10 (2006.01) C08K 5/32 (2006.01) C08K 9/04 (2006.01) H01M 8/02 (2006.01)

Patent

CA 2469862

An aqueous coating composition is provided comprising carbon particles, one or more highly fluorinated polymers and one or more amine oxide surfactants, typically an amine oxide surfactant according to formula (I) where n is 9 to 19. The coating composition is advantageously used in a method of making a gas diffusion layer for an electrochemical cell comprising the steps of: a) coating a electrically conductive porous substrate with the aqueous coating composition, and b) heating the electrically conductive porous substrate to a temperature sufficient to decompose the amine oxide surfactants. In another aspect, a gas diffusion layer for an electrochemical cell is provided which is advantageously free of surfactant.

Composition de revêtement aqueuse qui contient des particules de carbone, un ou plusieurs polymères fortement fluorés et un ou plusieurs tensioactifs du type oxyde d'amine, typiquement un tensioactif oxyde d'amine de formule (I) dans laquelle n vaut 9 à 19. Ladite composition est avantageusement utilisée dans un procédé de fabrication d'une couche de diffusion de gaz pour une cellule électrochimique. Ledit procédé consiste (a) à appliquer sur un substrat poreux électro-conducteur la composition de revêtement aqueuse selon la présente invention, et (b) à chauffer ledit substrat à une température suffisante pour décomposer les tensioactifs de type oxyde d'amine. Dans un autre mode de réalisation, la présente invention concerne une couche de diffusion de gaz pour une cellule électrochimique qui est avantageusement exempte de tensioactif.

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