Solid electrolyte material and solid-state battery made therewith
A solid electrolyte material comprising Li, T, X and A wherein T is at least one of P, As, Si, Ge, Al, and B; X is BH 4 ; A is S, Se, or N. The solid electrolyte material may include glass ceramic and/or mixed crystalline phases, and exhibits high ionic conductivity and compatibility with high voltage cathodes and lithium metal anodes.
1 . An Argyrodite-type solid electrolyte material comprising:
Li, T, X and A, wherein:
T comprises P, B, or a combination thereof;
X is one or more halogens or BH 4 , BF 4 , NH 2 , or NO 3 or a blend thereof,
A is one or more of S, Se, and N, and
the solid electrolyte material has peaks at 2θ=14.6°±0.25°, 15.3°±0.25°, and 25.1°±0.25° in X-ray diffraction measurement with Cu-Kα(1,2)=1.5418 Å.
2 . The solid electrolyte material of claim 1 , further comprising at least one of glass ceramic phases, crystalline phases and mixed phases.
3 . The solid electrolyte material of claim 1 , wherein a ratio of intensities of a peak at 2θ=15.3°+0.25° to a peak at 14.6°+0.25° is 5:1 or less.
4 . The solid electrolyte material of claim 1 , wherein X comprises a blend of one or more halogens and BH 4 .
5 . The solid electrolyte material of claim 1 , comprising a primary peak at 423±10 cm −1 with an intensity ratio of at least 2:1 with other peaks present in the range 250-700 cm −1 in Raman spectroscopic measurements with 532 nm excitation.
6 . The solid electrolyte material of claim 1 , comprising a crystalline Argyrodite-type phase comprising 50% or more by mol of total phases present.
7 . The solid electrolyte material of claim 1 , comprising a mixture of a crystalline phase having peaks at 2θ=14.6°±0.25°, 15.3°±0.25°, and 25.1°±0.25° in X-ray diffraction measurement with Cu-Kα(1,2)=1.5418 Å and of one or more of LiBH 4 , LiBF 4 , LINH 2 , LiNO 3 , LiSCN, and LiOCN.
8 . The solid electrolyte material of claim 1 , wherein the solid electrolyte material is formed from precursors comprising LiBH 4 .
9 . The solid electrolyte material of claim 1 , wherein the solid electrolyte material is formed from precursors comprising Li 3 PS 4 .
10 . The solid electrolyte material of claim 1 , having a general formula Li 5 PS 4 (BH 4 ) 2 .
11 . The solid electrolyte material of claim 1 , having a general formula (Li 2 S:P 2 S 5 : 2LiBH 4 ), wherein a molar ratio of Li 2 S:P 2 S 5 is from 70:30 to 83:17.
12 . The solid electrolyte material of claim 1 , having a general formula LPS·zLiX, wherein:
LPS is a mixture of Li 2 S and P 2 S 5 in a molar ratio from 1:1 to 4:1 (Li 2 S:P 2 S 5 ),
LiX is LiCl, LiBr, LiI, LiBH 4 , LiBF 4 , LINH 2 , LiNO 3 , or a combination thereof, and
z is from 0<z≤25.
13 . The solid electrolyte material of claim 1 , having a general formula LPSX·zLiX, wherein:
LPSX is a mixture of Li 2 S, P 2 S 5 and LiX in a molar ratio from 1:1:1 to 4:1:4 (Li 2 S:P 2 S 5 :LiX),
LiX is LiCl, LiBr, LiI, LiBH 4 , LiBF 4 , LiNH 2 , LiNO 3 , or a combination thereof, and
z is from 0<z≤25.
14 . A battery comprising the solid electrolyte material of claim 1 .
15 . The battery of claim 14 , wherein the solid electrolyte material is included in a positive electrode active material layer of the battery.
16 . The battery of claim 14 , wherein the solid electrolyte material is included in a negative electrode active material layer of the battery.
17 . The battery of claim 14 , wherein the solid electrolyte material is included in a solid electrolyte layer of the battery.