Cathode material for a high-temperature fuel cell (sofc) and...

H - Electricity – 01 – M

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H01M 8/12 (2006.01)

Patent

CA 2544728

The invention relates to a cathode material, particularly for use in a high- temperature fuel cell, comprising substoichiometric Ln1-x-yMyFe1-zCzO3- .delta., with 0.02 <= x <= 0.05, 0.1 <= y <= 0.6, 0.1 <= z <= 0.3, 0 <= .delta. <= 0.25 and with Ln = lanthanides, M = strontium or calcium and C = cobalt or copper. By using a particular production method, in which this cathode material having a specified grain size is used, and in which a (Ce, Gd)O2-.delta.-intermediate layer is advantageously formed between the cathode and electrolyte, a cathode is obtained that, when used in a high-temperature fuel cell, can achieve a power greater than 1 W/cm2 already at 750 ~C and a cell voltage of 0.7 V.

La présente invention concerne une matière pour cathode, notamment utilisée dans une pile à combustible haute température. Cette matière comprend du Ln¿1-x-y?M¿y?Fe¿1-z?C¿z?O¿3-?? stoechiométrique, avec 0,02 = x = 0,05, 0,1 = y = 0,6, 0,1 = z = 0,3, 0 = ? = 0,25 et avec Ln = lanthanides, M = strontium ou calcium et C = cobalt ou cuivre. La présente invention concerne également un procédé pour produire une cathode qui consiste à utiliser ladite matière de cathode présentant une taille de grain définie et à former avantageusement une couche intermédiaire de (Ce, Gd)O¿2-.delta.? entre la cathode et l'électrolyte. La cathode produite selon ce procédé permet d'obtenir, lorsqu'elle est utilisée dans une pile à combustible haute température, une puissance supérieure à 1 W/cm?2¿ et ce, dès 750 ·C et avec une tension de pile de 0,7 V.

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