Sulfide-Based Solid Electrolyte and Preparation Method Thereof

Patent metadata

Field	Value
Publication number	US-2018145369-A1
Application number	US-201715482785-A
Country	US
Kind code	A1
Filing date	Apr 9, 2017
Priority date	Nov 22, 2016
Publication date	May 24, 2018
Grant date	—

Abstract

A sulfide-based solid electrolyte contains a nickel (Ni) element and a halogen element. For example, a sulfide-based solid electrolyte can include, with respect to 100 parts by mole of a mixture of lithium sulfide (Li 2 S) and diphosphorus pentasulfide (P 2 S 5 ), 5 parts by mole to 20 parts by mole of nickel sulfide (Ni 3 S 2 ), and 5 parts by mole to 40 parts by mole of lithium halide.

First claim

What is claimed is:

1 . A sulfide-based solid electrolyte comprising:
with respect to 100 parts by mole of a mixture of lithium sulfide (Li 2 S) and diphosphorus pentasulfide (P 2 S 5 ), 5 parts by mole to 20 parts by mole of nickel sulfide (Ni 3 S 2 ); and 5 parts by mole to 40 parts by mole of lithium halide.

2 . The sulfide-based solid electrolyte of claim 1 , wherein the mixture comprises
60 mole % to 90 mole % of the lithium sulfide; and 10 mole % to 40 mole % of diphosphorus pentasulfide.

3 . The sulfide-based solid electrolyte of claim 1 , wherein the lithium halide is expressed by LiX, where X is Cl, Br or I.

4 . The sulfide-based solid electrolyte of claim 1 , wherein a crystallization temperature of the sulfide-based solid electrolyte is 200° C. to 400° C. and the sulfide-based solid electrolyte has a cubic crystal structure.

5 . The sulfide-based solid electrolyte of claim 4 , wherein the cubic crystal structure has diffraction peaks in an area of diffraction angles 2θ of 15.5±0.5°, 18±0.5°, 25.5±0.5°, 30±0.5°, 31.5±0.5°, 40±0.5°, 45.5±0.5°, 48±0.5°, 53±0.5°, 55±0.5°, 56.5±0.5° and 59.5±0.5° in an X-ray diffraction spectrum.

6 . The sulfide-based solid electrolyte of claim 1 , wherein a crystallization temperature of the sulfide-based solid electrolyte is 400° C. to 600° C. and the sulfide-based solid electrolyte has a cubic crystal structure.

7 . The sulfide-based solid electrolyte of claim 6 , wherein the cubic crystal structure has diffraction peaks in an area of diffraction angles 2θ of 15.5±0.5°, 18±0.5°, 25.5±0.5°, 30±0.5°, 31.5±0.5°, 40±0.5°, 45.5±0.5°, 48±0.5°, 53±0.5°, 55±0.5°, 56.5±0.5° and 59.5±0.5° in an X-ray diffraction spectrum.

8 . The sulfide-based solid electrolyte of claim 1 , wherein the sulfide-based solid electrolyte has high ion conductivity in a wide crystallization temperature range.

9 . A method of preparing a sulfide-based solid electrolyte, the method comprising:
preparing a starting material by adding 5 parts by mole to 20 parts by mole of nickel sulfide (Ni 3 S 2 ) and 5 parts by mole to 40 parts by mole of lithium halide with respect to 100 parts by mole of a mixture of lithium sulfide (Li 2 S) and diphosphorus pentasulfide (P 2 S 5 ); milling the starting material to obtain an amorphous material; and heat-treating the amorphous material to obtain a crystallized sulfide-based solid electrolyte.

10 . The method of claim 9 , wherein the mixture comprises
60 mole % to 90 mole % of the lithium sulfide; and 10 mole % to 40 mole % of diphosphorus pentasulfide.

11 . The method of claim 9 , wherein the lithium halide is expressed by LiX, where X is Cl, Br or I.

12 . The method of claim 9 , wherein the heat-treating is performed at 400° C. to 600° C. to obtain the crystallized sulfide-based solid electrolyte having a cubic crystal structure.

13 . The method of claim 12 , wherein the cubic crystal structure has diffraction peaks in an area of diffraction angles 2θ of 15.5±0.5°, 18±0.5°, 25.5±0.5°, 30±0.5°, 31.5±0.5°, 40±0.5°, 45.5±0.5°, 48±0.5°, 53±0.5°, 55±0.5°, 56.5±0.5° and 59.5±0.5° in an X-ray diffraction spectrum.

14 . The method of claim 9 , wherein, the heat-treating is performed at 200° C. to 400° C. to obtain the crystallized sulfide-based solid electrolyte having a cubic crystal structure.

15 . The method of claim 14 , wherein the cubic crystal structure has diffraction peaks in an area of diffraction angles 2θ of 15.5±0.5°, 18±0.5°, 25.5±0.5°, 30±0.5°, 31.5±0.5°, 40±0.5°, 45.5±0.5°, 48±0.5°, 53±0.5°, 55±0.5°, 56.5±0.5° and 59.5±0.5° in an X-ray diffraction spectrum.

16 . A sulfide-based solid electrolyte prepared by the method of claim 9 .

17 . The sulfide-based solid electrolyte of claim 16 , wherein the mixture comprises
60 mole % to 90 mole % of the lithium sulfide; and 10 mole % to 40 mole % of diphosphorus pentasulfide.

18 . The sulfide-based solid electrolyte of claim 16 , wherein the lithium halide is expressed by LiX, where X is Cl, Br or I.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Sung Ju Young
• Lee Ho Taek
• Lim Jae Min
• Jang Yong Jun

Classifications

• C04B35/6264

  Mixing media, e.g. organic solvents · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0525 Primary

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

• H01B1/10

  sulfides · CPC title