Provided is a solid electrolyte material comprising Li, Y, Br, and Cl. In an X-ray diffraction pattern in which CuK is used as a radiation source, peaks are present within all ranges of diffraction angles 2 of 13.6 to 14.4, 27.4 to 28.5, 31.8 to 32.9, 45.4 to 47.5, 54.0 to 56.1, and 56.6 to 59.0.

A solid electrolyte material contains Li, Y, at least one selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Sc, La, Sm, Bi, Zr, Hf, Nb, and Ta, and at least one selected from the group consisting of Cl, Br, and I. An X-ray diffraction pattern of the solid electrolyte material obtained by using Cu-K radiation as the X-ray source includes peaks within the range in which the diffraction angle 2 is 25 or more and 35 or less, and also includes at least one peak within the range in which the diffraction angle 2 is 43 or more and 51 or less.

A solid electrolyte material contains Li, M, and X. M contains Y, and X is at least one selected from the group consisting of Cl, Br, and I. A first converted pattern, which is obtained by converting the X-ray diffraction pattern of the solid electrolyte material to change its horizontal axis from the diffraction angle to q, includes its base peak within the range in which q is 2.109 .sup.1 or more and 2.315 .sup.1 or less. A second converted pattern, which is obtained by converting the X-ray diffraction pattern to change its horizontal axis from the diffraction angle to q/q.sub.0, where q.sub.0 is the q corresponding to the base peak in the first converted pattern, includes a peak within each of the range in which q/q.sub.0 is 1.28 or more and 1.30 or less and the range in which q/q.sub.0 is 1.51 or more and 1.54 or less.

A solid electrolyte material contains Li, M, and X. M contains Y, and X is at least one selected from the group consisting of Cl, Br, and I. A first converted pattern, which is obtained by converting the X-ray diffraction pattern of the solid electrolyte material to change its horizontal axis from the diffraction angle to q, includes its base peak within the range in which q is 2.109 .sup.1 or more and 2.315 .sup.1 or less. A second converted pattern, which is obtained by converting the X-ray diffraction pattern to change its horizontal axis from the diffraction angle to q/q.sub.0, where q.sub.0 is the q corresponding to the base peak in the first converted pattern, includes a peak within each of the range in which q/q.sub.0 is 1.28 or more and 1.30 or less and the range in which q/q.sub.0 is 1.51 or more and 1.54 or less.

Provided is a solid electrolyte material comprising Li, Y, Br, and Cl wherein in an X-ray diffraction pattern in which Cu-K is used as a radiation source, peaks are present within all ranges of diffraction angles 2 of 15.1 to 15.8, 27.3 to 29.5, 30.1 to 31.1, 32.0 to 33.7, 39.0 to 40.6, and 47.0 to 48.5.

Provided is a solid electrolyte material comprising Li, Y, Br, and Cl wherein in an X-ray diffraction pattern in which Cu-K is used as a radiation source, peaks are present within all ranges of diffraction angles 2 of 15.1 to 15.8, 27.3 to 29.5, 30.1 to 31.1, 32.0 to 33.7, 39.0 to 40.6, and 47.0 to 48.5.

Provided is a solid electrolyte material comprising Li, Y, Br, and I, wherein in an X-ray diffraction pattern in which Cu-K is used as a radiation source, peaks are present within all ranges of diffraction angles 2 of 12.5 to 14.0, 25.0 to 27.8, 29.2 to 32.3, 41.9 to 46.2, 49.5 to 54.7, and 51.9 to 57.5.

Provided is a solid electrolyte material represented by the following composition formula (1)

Li.sub.33aY.sub.1+aM.sub.aCl.sub.6xyBr.sub.xI.sub.yFormula (1) where M is one or more kinds of elements selected from the group consisting of Zr, Hf, and Ti; 1<<2; 0<a<1.5; 0<(33a); 0<(1+a); 0x6; 0y6; and (x+y)6.

Provided is a battery comprising a cathode, an anode, and an electrolyte layer. The electrolyte layer includes a first electrolyte layer and a second electrolyte layer. The first electrolyte layer includes a first solid electrolyte material. The second electrolyte layer includes a second solid electrolyte material which is a material different from the first solid electrolyte material. The first solid electrolyte material includes lithium, at least one kind selected from the group consisting of metalloid elements and metal elements other than lithium, and at least one kind selected from the group consisting of chlorine, bromine, and iodine. The first solid electrolyte material does not include sulfur.

Provided is a battery comprising a cathode, an anode, and an electrolyte layer. The electrolyte layer includes a first electrolyte layer and a second electrolyte layer. The first electrolyte layer includes a first solid electrolyte material. The second electrolyte layer includes a second solid electrolyte material which is a material different from the first solid electrolyte material. The first solid electrolyte material includes lithium, at least one kind selected from the group consisting of metalloid elements and metal elements other than lithium, and at least one kind selected from the group consisting of chlorine, bromine, and iodine. The first solid electrolyte material does not include sulfur.