Sulfide-based crystallized glass for all-solid secondary battery and a method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10008741-B2
Application number	US-201514951131-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Dec 18, 2014
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A sulfide-based crystallized glass for an all-solid secondary battery has a sulfide that includes Li 2 S and P 2 S 5 , wherein the sulfide-based crystallized glass consists of 1 to 5% by mole of Li 3 BO 3 . A method for manufacturing the sulfide-based crystallized glass comprises steps of mixing (1) 75 to 80% by mole of Li 2 S and 20 to 25% by mole of P 2 S 5 , and then mixing (2) 95 to 99% by mole of obtained mixture at (1) and 1 to 5% by mole of Li 3 BO 3 with a mechanical milling method, and subjecting the mixture thus obtained to a heat-treatment process.

First claim

What is claimed is:

1. A sulfide-based crystallized glass for an all-solid secondary battery, comprising:
a sulfide including Li 2 S and P 2 S 5 ; and 1 to 5% by mole of Li 3 BO 3 .

2. The sulfide-based crystallized glass of claim 1 ,
wherein the sulfide is composed of 75 to 80% by mole of Li 2 S and 20 to 25% by mole of P 2 S 5 .

3. The sulfide-based crystallized glass of claim 1 ,
wherein the sulfide-based crystallized glass includes at least one of a PO 4 3− ion, a PS 4 3− ion, and a BS 3 3− ion.

4. The sulfide-based crystallized glass of claim 1 , wherein an ionic conductivity of the sulfide-based crystallized glass is 0.77×10 −3 S/cm to 1.03×10 −3 S/cm.

5. The sulfide-based crystallized glass of claim 1 , wherein an activation energy of the sulfide-based crystallized glass is 20.7 kJ/mol to 24.0 kJ/mol.

6. The sulfide-based crystallized glass of claim 1 , wherein the Li 3 BO 3 is prepared by mixing lithium carbonate (Li 2 CO 3 ) and boron oxide (B 2 O 3 ), melting the mixture at 900 to 1000° C., and then quenching the mixture to reach room temperature.

7. A solid electrolyte for an all-solid secondary battery, the solid electrolyte being prepared using the sulfide-based crystallized glass of claim 1 as a raw material.

8. An all-solid secondary battery prepared using the solid electrolyte for an all-solid secondary battery of claim 7 .

9. A method for manufacturing a sulfide-based crystallized glass for an all-solid secondary battery, the method comprising steps of
mixing 75 to 80% by mole of Li 2 S, 20 to 25% by mole of P 2 S 5 , and 1 to 5% by mole of Li 3 BO 3 by mechanical milling,
and subjecting the mixture to heat-treatment.

10. The method of claim 9 , wherein the mechanical milling method is performed by mixing at 300 to 520 RPM for 20 to 25 hours using a ball mill apparatus.

11. The method of claim 9 , wherein the heat-treatment process is performed at 220 to 250° C.

Assignees

• Hyundai Motor Co Ltd
• Univ Hanyang Ind Univ Coop Found

Inventors

• Sung Ju Young
• Son Sam Ick
• Eom Min Yong
• Kim Jung Hoon
• Shin Dong Wook

Classifications

• H01M2300/0068

  inorganic · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title