Solid electrolyte material and solid-state battery made therewith

1. A solid electrolyte material comprising:

a crystalline phase comprising Li, P, X and A wherein X is one or more halogens or N; A is one or more of S and Se; and the crystalline phase has peaks at 17.8°±0.75° and 19.2°±0.75° in X-ray diffraction measurement with Cu-Kα(1,2)=1.5418 Å.

2. The solid electrolyte material of claim 1 , wherein the crystalline phase may be described by the general formula:

Li 1-a-c-d P a A c X d

in which 0<a≤0.129, 0.316≤c≤0.484, 0.012≤d≤0.125.

3. The solid electrolyte material of claim 2 , wherein a=0.111, c=0.444, d=0.056, A=S, and X=Cl.

4. The solid electrolyte material of claim 1 , further comprising at least one of glass ceramic phases and mixed phases.

5. The solid electrolyte material of claim 1 , wherein mixed phases comprise the crystalline phases containing peaks at 20.2°±0.75° and 23.6°±0.75°, and/or 21.0°±0.75° and 28.0°±0.75°, and/or 17.5°±0.75° and 18.2°±0.75° in X-ray diffraction measurement with Cu-Kα(1,2)=1.5418 Å.

6. The solid electrolyte material of claim 5 , wherein a ratio of peak intensity at 19.2°±0.75° to a peak at 17.5°±0.75° is 1 or more.

7. A lithium solid-state battery comprising a positive electrode active material layer containing a positive electrode active material; a negative electrode active material layer containing a negative electrode active material; and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, wherein at least one of the positive electrode active material layer, the negative electrode active material layer, and the solid electrolyte layer comprises the solid electrolyte material according to claim 1 .