Manufacturing method and current collector

H - Electricity – 01 – M

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H01M 2/26 (2006.01)

Patent

CA 2593503

A method of forming a current collector layer on electrode layers of an electrochemical air separation element and a current collector. A slurry is prepared that contains electrically conductive particles having surface deposits of a metallic oxide on a metal or metal alloy. The metallic oxide surface deposit constitutes a lower weight percentage of the electrically conductive particles than the metal or metal alloy. The slurry is applied to a structure that contains an electrolyte and electrode layers. The resultant coated form is then fired to partly sinter the electrically conductive particles to obtain porous current collector layers affixed to the electrode layers. The current collector is between about (5) microns and about (100) microns thick and preferably has a porosity of between about 10% percent and about 70% With pores having a pore size of between about (0.1) microns and about (20) microns.

L'invention concerne une couche de prise de courant (14) pour un élément de séparation d'air électrochimique ainsi que son procédé de formation. Une suspension boueuse est préparée, cette suspension boueuse contenant des particules conductrices (18) comprenant des dépôts superficiels d'un oxyde métallique sur un conducteur métallique ou en alliage métallique. Le dépôt superficiel d'oxyde métallique représente un pourcentage pondéral des particules conductrices plus faible que le métal ou l'alliage métallique. La suspension boueuse est appliquée sur des couches d'électrode (16) au moyen, par exemple, de techniques d'enrobage par trempage. La forme enrobée est ensuite cuite afin de fritter partiellement les conductrices et d'obtenir ainsi des couches de prise de courant fixées aux couches d'électrode. Le collecteur de courant (14) selon l'invention présente une épaisseur comprise entre environ 5 microns et environ 100 microns et, de préférence, une porosité comprise entre environ 10 % et environ 70 % de pores (12) dont la taille est comprise entre environ 0,1 microns et environ 20 microns.

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