Solid electrolyte material and battery using same

1 . A solid electrolyte material consisting of:

Li, M1, M2, and X, wherein

M1 is at least two selected from the group consisting of Ca, Mg, and Zn;

M2 is at least one selected from the group consisting of Y, Gd, and Sm;

X is at least one selected from the group consisting of F, Cl, Br, and I; and

in an X-ray diffraction pattern obtained by X-ray diffraction measurement of the solid electrolyte material using Cu-Kα rays:

there is a first peak in a diffraction angle 2θ range of 30.0° or more and 31.0° or less,

there is a second peak in a diffraction angle 2θ range of 39.0° or more and 40.3° or less,

there is a third peak in a diffraction angle 2θ range of 15.0° or more and 15.7° or less,

there is a fourth peak in a diffraction angle 2θ range of 16.3° or more and 17.1° or less, and

there is a fifth peak in a diffraction angle 2θ 0 range of 46.6° or more and 48.1° or less.

2 . The solid electrolyte material according to claim 1 , wherein

M1 is Ca and Mg or is Ca and Zn.

3 . The solid electrolyte material according to claim 1 , wherein

X is at least one selected from the group consisting of Cl and Br.

4 . The solid electrolyte material according to claim 1 , represented by a following composition formula (1):

Li 3−2a−3b (Ca 1−x M1′ x ) a (Y 1−y M2′ y ) 1+b Br 6−z CL z   (1)

here,

M1′ is at least one selected from the group consisting of Zn and Mg;

M2′ is at least one selected from the group consisting of Gd and Sm; and

following five mathematical expressions:

0<a ≤0.3;

0≤b ≤0.1;

0<x ≤0.5;

0≤y ≤0.9; and

0≤z≤6

are satisfied.

5 . A battery comprising:

a positive electrode;

a negative electrode; and

an electrolyte layer disposed between the positive electrode and the negative electrode, wherein

at least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer contains the solid electrolyte material according to claim 1 .