Process for preparing lithium sulfide
The invention relates to a novel process for preparing lithium sulfide and to the use thereof, wherein a reaction of lithium-containing strong bases with hydrogen sulfide is undertaken in an aprotic organic solvent within the temperature range from −20 to 120° C. under inert conditions. The lithium sulfide obtained by the process is used as a positive material in a galvanic element or for the synthesis of Li ion-conductive solids, especially for the synthesis of glasses, glass ceramics or crystalline products.
1. A method for preparing lithium sulfide comprising:
reacting a lithium-containing base selected from the group consisting of a lithium alkylene, a lithium arylene, and a lithium amide with hydrogen sulfide in an aprotic organic solvent at a temperature of from −20° to 120° C. under inert conditions, wherein the aprotic organic solvent comprises at least one member selected from the group consisting of an aliphatic hydrocarbon, an aromatic hydrocarbon and an etheric solvent.
2. A method according to claim 1 , wherein the lithium-containing base is butyllithium.
3. A method according to claim 1 , wherein the lithium-containing base is selected from the group consisting of butyllithium, hexyllithium, lithium diisopropylamide and lithium hexamethyldisilazide.
4. A method according to claim 1 , wherein the aprotic organic solvent is the etheric solvent.
5. A method according to claim 1 , wherein the aprotic organic solvent comprises at least one member selected from the group consisting of hexane, toluene, diethyl ether, and tetrahydrofuran.
6. A method according to claim 1 , wherein the reaction is carried out at a temperature range of 0° to 80° C.
7. A positive electrode comprising the lithium sulfide prepared by the process of claim 1 and a galvanic element.
8. A Li ion-conductive solids comprising the lithium sulfide prepared by the method of claim 1 .
9. A glass, glass ceramics, or crystalline product comprising the lithium sulfide prepared by the method of claim 1 .
10. Li argyrodite prepared with the lithium sulfide prepared by the method of claim 1 .
11. A method according to claim 2 , wherein the aprotic organic solvent is the etheric solvent.
12. A method according to claim 3 , wherein the aprotic organic solvent is the etheric solvent.
13. A method according to claim 2 , wherein the aprotic organic solvent comprises at least one member selected from the group consisting of hexane, toluene, diethyl ether, and tetrahydrofuran.
14. A method according to claim 3 , wherein the aprotic organic solvent comprises at least one member selected from the group consisting of hexane, toluene, diethyl ether, and tetrahydrofuran.
15. A glass, glass ceramics, or crystalline product according to claim 9 , wherein the reaction is carried out at a temperature range of 0° to 80° C.
16. Li argyrodite according to claim 10 , wherein the reaction is carried out at a temperature range of 0° to 80° C.
17. A method according to claim 4 , wherein the reaction is carried out at a temperature range of 0° to 80° C.
18. A method according to claim 5 , wherein the reaction is carried out at a temperature range of 0° to 80° C.
19. Li argyrodite according to claim 10 , wherein the aprotic organic solvent comprises at least one member selected from the group consisting of hexane, toluene, diethyl ether, and tetrahydrofuran.
20. Li argyrodite according to claim 16 , wherein the aprotic organic solvent comprises at least one member selected from the group consisting of hexane, toluene, diethyl ether, and tetrahydrofuran.