MULTILAYER SOLID ELECTROLYTE FOR SOLID FUEL CELL

摘要

PROBLEM TO BE SOLVED: To lower the power generation loss in a solid electrolyte without deteriorating mechanical strength and causing the increase of the material cost by using a material of a composition with high mechanical strength and an advantage from a viewpoint of the cost for the main component of an electrolyte and forming a thin layer having high ion conduction only on the surface in contact with an electrode. SOLUTION: As for a zirconia solid electrolyte to which rare earth metals are added; the solid electrolyte is composed of ion conductive layers 3 with high ion conductivity and a supporting layer 4 with low ion conductivity. The thickness of the ion conductive layers 3 with high ion conductivity is 0.03-50μm and an ion conductive layer 3 with high ion conductivity is formed in either a fuel electrode side or an air electrode side of an electrolyte or both surface sides.