SOLID ELECTROLYTE MATERIAL SYNTHESIS METHOD
A solid electrolyte material may be advantageously synthesized using a multipart solvent/solution based method employing selective solvation and/or particle size reduction for different reactants used to form the solid electrolyte.
1 . A method for producing a sulfide solid electrolyte material comprising the steps of:
combining an alkali metal salt and a sulfide compound containing at least one of P, B, Al, As, Sb, Bi, Si, Ge, and Sn with a polar aprotic solvent to form a first solution;
combining an alkali metal salt and a polar protonated solvent to form a second solution;
combining the first and second solutions to form a third solution; and
drying the third solution to produce a sulfide solid electrolyte material.
2 . The method as recited in claim 1 further comprising combining an alkali metal halide with the alkali metal salt and the polar protonated solvent.
3 . The method as recited in claim 1 wherein the alkali metal salt is selected from the group consisting of Li 2 S and Li 3 N.
4 . The method as recited in claim 1 wherein the alkali metal salt is Li 2 S with a particle size of 20 μm or smaller.
5 . The method as recited in claim 1 wherein the first solution has a molar ratio of Li 2 S:P 2 S 5 between 9:11 and 11:9.
6 . The method as recited in claim 1 further comprising the step of heating the sulfide solid electrolyte material to a temperature higher than the drying temperature to increase the ionic conductivity of the sulfide solid electrolyte material.
7 . The method as recited in claim 1 wherein the sulfide solid electrolyte material comprises a lithium argyrodite phase.
8 . The method as recited in claim 1 further comprising the step of stirring each of the first, second and third solutions for a period ranging between 15 minutes and 12 hours.
9 . A method for producing a sulfide solid electrolyte material comprising the steps of:
combining an alkali metal salt and a sulfide compound containing at least one of P, B, Al, As, Sb, Bi, Si, Ge, and Sn with a polar aprotic solvent to form a first solution;
combining an alkali metal salt and ethanol to form a second solution;
combining the first and second solutions to form a third solution; and
drying the third solution to produce a sulfide solid electrolyte material.
10 . The method as recited in claim 9 further comprising combining an alkali metal halide with the alkali metal salt and the ethanol.
11 . The method as recited in claim 9 wherein the alkali metal salt is selected from the group consisting of Li 2 S and Li 3 N.
12 . The method as recited in claim 9 wherein the alkali metal salt is Li 2 S with a particle size of 20 μm or smaller.
13 . The method as recited in claim 9 wherein the first solution has a molar ratio of Li 2 S:P 2 S 5 between 9:11 and 11:9.
14 . The method as recited in claim 9 wherein the sulfide solid electrolyte material comprises a lithium argyrodite phase.
15 . The method as recited in claim 9 further including the step of stirring each of the first, second and third solutions for a period ranging between 15 minutes and 12 hours.
16 . A method for producing a sulfide solid electrolyte material comprising the steps of:
combining an alkali metal salt and a sulfide compound containing at least one of P, B, Al, As, Sb, Bi, Si, Ge, and Sn with a Nitrogen-bearing polar aprotic solvent to form a first solution;
combining an alkali metal salt and ethanol to form a second solution;
combining the first and second solutions to form a third solution; and
drying the third solution to produce a sulfide solid electrolyte material.
17 . The method as recited in claim 16 further comprising combining an alkali metal halide with the alkali metal salt and the ethanol.
18 . The method as recited in claim 16 wherein the Nitrogen-bearing polar aprotic solvent is acetonitrile, propionitrile, isobutyronitrile, malonitrile, fumaronitrile, or a combination thereof.
19 . The method as recited in claim 16 wherein the alkali metal salt is selected from the group consisting of Li 2 S and Li 3 N.
20 . The method as recited in claim 16 wherein the alkali metal is Li 2 S with a particle size of 2.0 μm or smaller.
21 . The method as recited in claim 16 wherein the first solution has a molar ratio of Li 2 S:P 2 S 5 between 9:11 and 11:9.
22 . The method as recited in claim 16 wherein the sulfide solid electrolyte material comprises a lithium argyrodite phase.
23 . The method as recited in claim 16 further comprising the step of stirring each of the first, second and third solutions for a period ranging between 15 minutes and 12 hours.