Solid electrolyte, solid electrolyte membrane, fuel battery cell, and fuel battery

摘要

Provided is solid electrolyte utilizing a composite oxide of a RP-type structure, that is useful for achieving strong electromotive force and enhanced current-voltage characteristics of a fuel battery, has enhanced ion conductivity and sufficiently inhibited electronic conductivity, and is capable of intercalation of a large amount of water or hydrogen groups, as well as a solid electrolyte membrane, a fuel battery cell, and a fuel battery. The solid electrolyte and the solid electrolyte membrane of the present invention has been obtained by subjecting a particular composite oxide of a RP-type structure or a membrane thereof to a treatment of at least one of hydroxylation and hydration, and has a property that the mass determined by TG measurement at 400° C. is less than that at 250° C. by not less than 4.0%.

主权项

1. A solid electrolyte obtained by subjecting a composite oxide of a Ruddlesden-Popper-type structure represented by the formula (1) or (2) to a treatment of at least one of hydroxylation and hydration, wherein said solid electrolyte has a property that a mass determined by thermogravimetric (TG) measurement at 400° C. is less than a mass determined by TG measurement at 250° C. by not less than 4.0%:
(ABO3)n−AO  (1) An+1BnO3n+1  (2) wherein A stands for La and Sr; B stands for Fe alone or Fe and at least one of Co, Mn, Cu, Ti, Pd, Ni, Nb, and Ta; and n denotes an integer of 1 to 3.