Solid electrolyte material, battery using same, and method for producing solid electrolyte material

1 . A solid electrolyte particle consisting of Li, DC, Y, Sm and X or made of a compound including Li, DC, Y, Sm and X as a main component,

wherein

the DC is at least one selected from the group consisting of Mg, Ca, Sr, Ba, and Zn,

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

when the solid electrolyte particle is made of the compound including Li, DC, Y, Sm and X as a main component, a largest amount component of the particle in molar ratio is the compound,

a median diameter of the solid electrolyte particles is 0.5 μm or more and 10 μm or less, and

the solid electrolyte particle is represented by the following composition formula (1),

Li 3−2a−3d DC a Y 1−b Sm b+d Br 6−c Cl c   (1)

where the following four mathematical relations are satisfied:

0<a≤0.25;

0<b<1;

0≤c≤6; and

0≤d≤0.05.

2 . The solid electrolyte particle according to claim 1 ,

wherein

the DC is Ca.

3 . The solid electrolyte particle according to claim 1 ,

wherein

a mathematical relation 0.01≤a≤0.15 is satisfied.

4 . The solid electrolyte particle according to claim 1 ,

wherein

a mathematical relation 0.01≤b≤0.5 is satisfied.

5 . The solid electrolyte particle according to claim 1 ,

wherein

a mathematical relation 3.5≤c≤4.5 is satisfied.

6 . The solid electrolyte particle according to claim 1 ,

wherein

in an X-ray diffraction pattern obtained by X-ray diffraction measurement of a plurality of solid electrolyte particles each being the solid electrolyte particle of claim 1 , using a Cu-Kα ray,

at least one peak is present within a range of a diffraction angle 2θ from 29.0° to 32.0°, and

at least two peaks are present within a range of the diffraction angle 2θ from 14.0° to 18.0°.

7 . The solid electrolyte particle according to claim 1 ,

wherein

in an X-ray diffraction pattern obtained by X-ray diffraction measurement of a plurality of solid electrolyte particles each being the solid electrolyte particle of claim 1 , using a Cu-Kα ray,

at least two peaks are present within a range of a diffraction angle 2θ from 24.0° to 35.0°, and

at least one peak is present within a range of the diffraction angle 2θ from 12.0° to 16.0°.

8 . The solid electrolyte particle according to claim 7 ,

wherein

in the X-ray diffraction pattern,

at least two peaks are present within a range of the diffraction angle 2θ from 26.0° to 35.0°, and

at least one peak is present within a range of the diffraction angle 2θ from 13.7° to 16.0°.

9 . The solid electrolyte particle according to claim 1 , wherein 0≤c<6 is satisfied.

10 . The solid electrolyte particle according to claim 1 , wherein 0<c<6 is satisfied.

11 . A battery comprising:

a positive electrode;

a negative electrode; and

an electrolyte layer provided 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 includes the solid electrolyte particle according to claim 1 .

12 . A method of manufacturing a solid electrolyte material, the method comprising

firing a mixed material in an inert gas atmosphere, the mixed material including a halide including Li, a halide including Y, a halide including Sm, and a halide including DC, wherein

the DC is at least one selected from the group consisting of Mg, Ca, Sr, and Ba,

the solid electrolyte material is a solid electrolyte particle consisting of Li, DC, Y, Sm and X or made of a compound including Li, DC, Y, Sm and X as a main component,

wherein

the DC is at least one selected from the group consisting of Mg, Ca, Sr, Ba, and Zn,

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

when the solid electrolyte particle is made of the compound including Li, DC, Y, Sm and X as a main component, a largest amount component of the particle in molar ratio is the compound,

a median diameter of the solid electrolyte particles is 0.5 μm or more and 10 μm or less, and

the solid electrolyte particle is represented by the following composition formula (1),

Li 3−2a−3d DC a Y 1−b Sm b+d Br 6−c Cl c   (1)

where the following four mathematical relations are satisfied:

0<a≤0.25;

0<b<1;

0≤c≤6; and

0≤d≤0.05.

13 . The method according to claim 12 , wherein

in the firing, the mixed material is fired at 200° C. or more and 650° C. or less.

14 . The method according to claim 12 , wherein

the mixed material is a material in which Liα, Yβ 3 , Smγ 3 , and DCδ 2 are mixed and

the α, the β, the γ, and the δ are each independently at least one selected from the group consisting of Br and Cl.