Patent ID: 7297436
Filing Date: 2007-11-20
Classification: H01M,Y02E,Y02P

Abstract:
1. A solid electrolytic fuel cell having an oxygen electrode layer on one surface of a solid electrolytic layer, having a fuel electrode layer on the other surface of the solid electrolytic layer, and having a reaction-preventing layer comprising a sintered body of an oxide between the solid electrolytic layer and the oxygen electrode layer for preventing elements from diffusing from the oxygen electrode layer into the solid electrolytic layer, wherein: the oxygen electrode layer has a two-layer structure including an inner layer on the side of the reaction-preventing layer and a surface layer on the inner layer; the surface layer of the oxygen electrode layer comprises a sintered body of a perovskite composite oxide; and the inner layer of the oxygen electrode layer comprises a sintered body of a mixture of particles of an oxide for preventing the diffusion of elements and particles of the peroviskite composite oxide, and is formed more densely than said surface layer, wherein the inner layer of the oxygen electrode layer contains 10 to 30 mass % of the oxide for preventing the diffusion of elements and contains 70 to 90 mass % of the perovskite composite oxide, wherein said oxide for preventing the diffusion of elements is not present in said surface layer of the oxygen electrode.