Method of manufacturing solid electrolyte for all-solid cells, solid electrolyte manufactured using the method, and all-solid cell including the solid electrolyte

1. A method of manufacturing a solid electrolyte for all-solid cells, comprising:

preparing an electrolyte admixture comprising a solid electrolyte precursor and a solvent;

drying the electrolyte admixture and removing the solvent to form a dry electrolyte mixture; and

heat-treating the dry electrolyte mixture to form a crystallized solid electrolyte,

wherein the crystallized solid electrolyte has an argyrodite-type crystalline structure.

2. The method according to claim 1 , wherein the solid electrolyte precursor is dissolved in the solvent.

3. The method according to claim 1 , wherein no milling process is performed.

4. The method according to claim 1 , wherein the solid electrolyte precursor comprises one selected from the group consisting of a lithium (Li) element, a sulfur (S) element, a phosphorus (P) element, a brome (Br) element, an iodine (I) element, lithium sulfide (Li 2 S), phosphorus pentasulfide (P 2 S 5 ), lithium bromide (LiBr), lithium chloride (LiCl), lithium iodide (LiI) and a combination thereof.

5. The method according to claim 1 , wherein the solvent comprises one or more selected from the group consisting of ethanol, propanol, butanol, dimethyl carbonate, ethyl acetate, tetrahydrofuran, 1,2-dimethoxyethane, propylene glycol dimethyl ether, and acetonitrile.

6. The method according to claim 3 , wherein the electrolyte admixture comprises lithium (Li), phosphorus (P), sulfur (S), and chlorine (Cl) at a molar ratio of about 6:1:5:1.

7. The method according to claim 1 , wherein the drying is performed at a temperature of about 25° C. to 200° C. for about 1 to 3 hours.

8. The method according to claim 1 , wherein the heat treatment is performed at a temperature of about 400° C. to 600° C.

9. The method according to claim 1 , wherein the crystallized solid electrolyte has an argyrodite-type crystalline structure comprising PS 4 −3 .

10. A solid electrolyte manufactured using the method according to claim 1 .

11. An all-solid cell comprising:

a solid electrolyte layer comprising the solid electrolyte according to claim 10 ;

a positive electrode disposed on a first surface of the solid electrolyte layer, the positive electrode comprising the solid electrolyte; and

a negative electrode disposed on a second surface of the solid electrolyte layer, wherein the first surface and the second surface of the solid electrolyte layer are opposite surfaces.

12. The all-solid cell according to claim 11 , wherein

the positive electrode further comprises an active material and a conductive agent, and

the negative electrode comprises a lithium (Li) element.

13. A vehicle comprising an all-solid cell according to claim 11 .