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

Patent metadata

Field	Value
Publication number	US-11114690-B2
Application number	US-201916379239-A
Country	US
Kind code	B2
Filing date	Apr 9, 2019
Priority date	Oct 16, 2018
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

Disclosed are a method of manufacturing a solid electrolyte, a solid electrolyte manufactured using the method, and an all-solid cell including the solid electrolyte. The method includes preparing an electrolyte admixture including a solid electrolyte precursor and a solvent, drying the electrolyte admixture and removing the solvent from the electrolyte admixture to form a dry electrolyte mixture, and heat-treating the dry electrolyte mixture to form a crystallized solid electrolyte.

First claim

What is claimed is:

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 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Jang Yong Jun
• Oh Pil Gun
• Min Hong Seok
• Yoon Yong Sub
• Kim Sa Heum
• Seong Ju Yeong

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• C01B25/14

  Sulfur, selenium, or tellurium compounds of phosphorus · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title