Solid electrolyte and lithium ion battery

Abstract

A solid electrolyte which reduces grain boundary resistance and exhibits a high total ion conductivity is provided. The solid electrolyte includes a first area which has a cubic garnet type crystalline and a second area which is amorphous, around the first area, in which each of the first area and the second area contains a composite oxide represented by formula (1) or (2) as a forming material, and an abundance ratio of metal atoms each having an ionic radius of 78 pm or more gradually increases from the first area to the second area. Li7+xLa3−xZr2AxO12  (1) [In formula (1), A is at least one selected from the group consisting of Mg, Ca, Sr, and Ba. In addition, x is 0.1 or more and 0.6 or less.] Li7La3−xZr2BxO12  (2) [In formula (2), B is at least one selected from the group consisting of Sc and Y. In addition, x is 0.1 or more and 0.6 or less.]

Dependencies are inferred from the claim text.