Solid electrolyte for all-solid battery having argyrodite-type crystal structure derived from single element and method of preparing the same

Patent metadata

Field	Value
Publication number	US-2019190007-A1
Application number	US-201816180240-A
Country	US
Kind code	A1
Filing date	Nov 5, 2018
Priority date	Dec 20, 2017
Publication date	Jun 20, 2019
Grant date	—

Abstract

Disclosed is a solid electrolyte for an all-solid battery and a method of preparing the same. Particularly, the solid electrolyte may have an argyrodite-type crystal structure.

First claim

What is claimed is:

1 . A solid electrolyte for an all-solid battery, comprising:
sulfur (S) element derived from an elemental sulfur powder; phosphorus (P) element derived from an elemental phosphorus powder; lithium (Li) element derived from an elemental lithium powder; and halogen element derived from a halogen compound powder, wherein the solid electrolyte comprises an argyrodite-type crystal structure.

2 . The solid electrolyte of claim 1 , wherein the halogen element comprises bromine (Br), chlorine (Cl), iodine (I) or combinations thereof.

3 . The solid electrolyte of claim 1 , wherein the solid electrolyte has an argyrodite-type crystal structure, as represented by Chemical Formula 1:
Li 6 PS 5 X   [Chemical Formula 1]
wherein X is Cl, Br or I.

4 . The solid electrolyte of claim 1 , wherein the solid electrolyte has an argyrodite-type crystal structure, as represented by Chemical Formula 2:
Li 6 PS 5 Cl   [Chemical Formula 2]

5 . A method of preparing a solid electrolyte for an all-solid battery, comprising:
providing a powder mixture comprising an elemental sulfur powder, an elemental phosphorus powder, an elemental lithium powder and a halogen compound powder; amorphizing the powder mixture; and heat treating the amorphized powder mixture, wherein the solid electrolyte comprises an argyrodite-type crystal structure.

6 . The method of claim 5 , wherein the amorphized powder mixture is crystalized by the heat treating.

7 . The method of claim 5 , wherein the halogen compound is selected from the group consisting of lithium bromide (LiBr), lithium chloride (LiCl), lithium iodide (LiI) and combinations thereof.

8 . The method of claim 5 , wherein the amorphizing is performed by milling.

9 . The method of claim 8 , wherein the amorphizing is performed by adding the powder mixture to a solvent and then milling using a planetary mill at about 300 RPM to 1000 RPM for about 4 hr to 40 hr.

10 . The method of claim 9 , wherein the solvent comprises:
at least one hydrocarbon-based solvent selected from among pentane, hexane, 2-ethyl hexane, heptane, octane, cyclohexane and methyl cyclohexane; at least one selected from among benzene, toluene, xylene and ethylbenzene; at least one selected from among diethyl ether, tetrahydrofuran and 1,4-dioxane; and at least one selected from among ethyl propionate and propyl propionate.

11 . The method of claim 5 , wherein the heat treating is performed at a temperature of about 200° C. to 550° C. for about 1 min to 100 hr.

12 . The method of claim 5 , wherein the solid electrolyte has an argyrodite-type crystal structure, as represented by Chemical Formula 1:
Li 6 PS 5 X, wherein X is Cl, Br or I.   [Chemical Formula 1]

13 . The method of claim 5 , wherein the solid electrolyte has an argyrodite-type crystal structure, as represented by Chemical Formula 2:
Li 6 PS 5 Cl   [Chemical Formula 2]

14 . An all-solid battery comprising a solid electrolyte of claim 1 .

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

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

Classifications

• H01M4/364

  as mixtures · CPC title

• H01M4/388

  Halogens · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/136 Primary

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M2300/004

  Three solvents · CPC title