Cell materials variation in sofc stacks to address thermal...

H - Electricity – 01 – M

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H01M 4/86 (2006.01) H01M 4/88 (2006.01) H01M 4/92 (2006.01) H01M 8/02 (2006.01) H01M 8/12 (2006.01)

Patent

CA 2693894

A solid oxide fuel cell having a plurality of planar layered fuel cell units, an electrically conductive flow separator plate disposed between each of the fuel cell units, and a cathode contact material element disposed between each cathode electrode of the fuel cell units and each electrically conductive flow separator plate. The cathodes of the individual fuel cell units are modified such that the operating temperatures of the cathodes are matched with the temperatures they experience based upon their locations in the fuel cell stack. The modification involves adding to the cathode contact material and/or cathode at least one alloying agent which modifies the temperature of the cathode electrodes based upon the location of the cathode electrodes within the fuel cell stack. These alloying agents react with a component of the cathode electrode to form alloys.

La présente invention concerne une pile à combustible à oxyde solide possédant une pluralité d'unités de pile à combustible stratifiées planaires, une plaque de séparation de flux électriquement conductrice placée entre chacune de ces unités, et un élément de matériau de contact de cathode placé entre chaque électrode cathodique des unités de pile à combustible et chaque plaque de séparation de flux électriquement conductrice. Les cathodes des unités de pile à combustible individuelles sont modifiées de telle sorte que les températures de fonctionnement des cathodes sont harmonisées avec les températures que celles-ci connaissent, sur la base de leur emplacement dans l'empilement de piles à combustible. La modification implique l'ajout au matériau de contact de la cathode et/ou à la cathode d'au moins un agent d'alliage qui modifie la température des électrodes cathodiques, sur la base de l'emplacement des électrodes cathodiques au sein de l'empilement de piles à combustible. Ces agents d'alliage réagissent avec un composant de l'électrode cathodique pour former des alliages.

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