Solid electrolyte and method of manufacturing solid electrolyte

Abstract

[Problem to be Solved] An object is to provide a solid electrolyte which is improved in relative density while having favorable lithium-ion conductivity and which can be preferably employed in a lithium-air battery and the like, and a method of manufacturing the same. [ Solution] In a solid electrolyte satisfying formula (I): Li1+XM1XM2YTi2-X-Y(PO4)3  (I) (in formula (I), M1 is one or more elements selected from the group consisting of Al3+, Cu3+, Co3+, Fe3+, Ni3+, Ga3+, Cr3+, and Sc3+, M2 is one or more elements selected from the group consisting of Si4+, Ge4+, Sn4+, Hf4+, and Zr4+, and X and Y are real numbers satisfying X+Y≦1), the solid electrolyte has a NASICON-type crystal structure, and lattice constants of the NASICON-type crystal structure are such that a length along an a-axis is 0.8 nm or more and a length along a c-axis is 2.8 nm or less. Moreover, in a solid electrolyte satisfying formula (II): Li1+X-YAlXNbYTi2-X-Y(PO4)3  (II) (in formula (II), X and Y are real numbers satisfying X+Y≦1), the solid electrolyte has a NASICON-type crystal structure.

Dependencies are inferred from the claim text.