Production method for solid electrolyte having Li3PS4
The present invention can provide a production method for a solid electrolyte having Li 3 PS 4 , said method characterized by including: a solution-making step in which a homogenous solution is prepared by mixing Li 2 S and P 2 S 5 into an organic solvent; and a precipitation step in which further Li 2 S is added to and mixed in the homogenous solution and a precipitate is formed. Preferably, the embodiment either has a molar ratio (Li 2 S/P 2 S 5 ) between the Li 2 S and the P 2 S 5 in the solution-making step of 1.0-1.85 or has further Li 2 S added to the homogenous solution in the precipitation step such that the molar ratio becomes Li 2 S/P 7 S 5 =2.7-3.3.
1. A method for producing a solid electrolyte having Li 3 PS 4 , which comprises:
a solution-making step in which a homogenous solution is prepared by mixing Li 2 S and P 2 S 5 into an organic solvent; and
a precipitation step in which Li 2 S is further added to and mixed in the homogenous solution to form a precipitate.
2. The method according to claim 1 , wherein a molar ratio between Li 2 S and P 2 S 5 (Li 2 S/P 2 S 5 ) in the solution-making step is 1.0 to 1.85.
3. The method according to claim 1 , wherein Li 2 S is further added to the homogenous solution in the precipitation step so that the molar ratio of Li 2 S/P 2 S 5 becomes 2.7 to 3.3.
4. The method according to claim 1 , which comprises a drying step after the precipitation step, wherein a drying temperature in the drying step is 120° C. or higher, and wherein said Li 3 PS 4 is β-Li 3 PS 4 .
5. The method according to claim 1 , wherein Li 2 S and P 2 S 5 are dissolved in the organic solvent in this order in the solution-making step so that a total concentration of Li 2 S and P 2 S 5 becomes 1 to 40% by weight.
6. The method according to claim 1 , wherein the organic solvent is an ether-based solvent.
7. The method according to claim 6 , wherein the ether-based solvent is tetrahydrofuran.
8. The method according to claim 1 , wherein the solution-making step and the precipitation step are carried out under inert gas atmosphere.