Sulfide-based solid electrolyte doped with alkaline earth metal and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2020194827-A1
Application number	US-201916664070-A
Country	US
Kind code	A1
Filing date	Oct 25, 2019
Priority date	Dec 18, 2018
Publication date	Jun 18, 2020
Grant date	—

Abstract

The present disclosure relates to a sulfide-based solid electrolyte doped with an alkaline earth metal for improving the ionic conductivity thereof and a method of manufacturing the same. The sulfide-based solid electrolyte is represented by Chemical Formula 1 below. The sulfide-based solid electrolyte exhibits high voltage stability and ionic conductivity. Consequently, it is possible to obtain an all-solid-state battery having a large capacity and stable behavior using the sulfide-based solid electrolyte.
Li 6-2x Me x PS 5 Ha   [Chemical Formula 1]
wherein Me is an alkaline earth metal element, Ha is a halogen element, and 0<x≤0.5.

First claim

What is claimed is:

1 . A sulfide-based solid electrolyte represented by Chemical Formula 1 below.
Li 6-2x Me x PS 5 Ha   [Chemical Formula 1]
wherein Me is an alkaline earth metal element, Ha is a halogen element, and 0<x—0.5.

2 . The sulfide-based solid electrolyte of claim 1 , wherein the sulfide-based solid electrolyte comprises a crystalline phase having an argyrodite-based crystalline structure.

3 . The sulfide-based solid electrolyte of claim 1 , wherein Me is an alkaline earth metal element selected from a group consisting of Ca, Mg, and a combination thereof.

4 . The sulfide-based solid electrolyte of claim 1 , wherein the Ha is a halogen element selected from a group consisting of Cl, Br, and a combination thereof.

5 . An all-solid-state battery comprising:
a positive electrode; a negative electrode; and a solid electrolyte layer disposed between the positive electrode and the negative electrode, wherein at least one of the positive electrode, the negative electrode, and the solid electrolyte layer comprises the sulfide-based solid electrolyte of claim 1 .

6 . A method of manufacturing a sulfide-based solid electrolyte, the method comprising:
preparing a mixture of lithium sulfide, phosphorus pentasulfide, and a compound selected from a group consisting of a halogen compound, an alkaline earth metal compound, and a combination thereof; pulverizing the mixture to yield a pulverized mixture; and thermally treating the pulverized mixture.

7 . The method of claim 6 , wherein the sulfide-based solid electrolyte is represented by Chemical Formula 1 below.
Li 6-2x Me x PS 5 Ha   [Chemical Formula 1]
wherein Me is an alkaline earth metal element, Ha is a halogen element, and 0<x≤0.5.

8 . The method of claim 6 , wherein
the halogen compound is LiHa, and the Ha is a halogen element selected from a group consisting of Cl, Br, and a combination thereof.

9 . The method of claim 6 , wherein
the alkaline earth metal compound is MeHa 2 or MeS, the Me is an alkaline earth metal element selected from a group consisting of Ca, Mg, and a combination thereof, and the Ha is a halogen element selected from a group consisting of Cl, Br, and a combination thereof.

10 . The method of claim 6 , wherein the sulfide-based solid electrolyte comprises a crystalline phase having an argyrodite-based crystalline structure.

11 . The method of claim 6 , wherein thermally treating is performed at 400 to 600° C. for 3 to 24 hours.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Univ Hanyang Ind Univ Coop Found

Inventors

• Seong Ju Yeong
• Song In Woo
• Min Hong Seok
• Jang Yong Jun
• Kim Yun Sung
• Shin Dong Wook
• Park Chan Hwi
• Lee Sang Soo
• Kim Kyu Beom

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C01F11/00

  Compounds of calcium, strontium, or barium (C01F7/00 takes precedence) · CPC title