SOLID ELECTROLYTE CERAMICS AND SOLID-STATE BATTERY

WIPO Patent Application WO/2023/223712

A1

The present invention provides solid electrolyte ceramics that more sufficiently suppress an increase in the electron conductance resulting from operation of a solid-state battery while still having excellent ion conductivity. The present invention is a solid electrolyte ceramic that has a garnet-type crystal structure, the solid electrolyte ceramic having a chemical composition that is represented by the general formula AαBβDγOω (in the formula: A is one or more elements selected from the group consisting of Li, Ga, Al, Mg, An, and Sc, and includes at least Li; B is one or more elements selected from the group consisting of La, Ca, Sr, Ba, and lanthanides, and includes at least La; and D is one or more elements selected from the group consisting of a transition element that is capable of a 6-coordinate bond with oxygen, and a typical element that belongs to groups 12–15), while further including one or more transition metal elements selected from the group consisting of Co, Ni, Mn, and Fe. When the solid electrolyte ceramic contains 100 mol% of D in the formula, X (mol%) of Li, and Y (mol%) of B, the following relationship is satisfied: in the range of 330