Lithium ion-conductive sulfide-based solid electrolyte comprising nickel sulfide and all-solid state battery using the same

Patent metadata

Field	Value
Publication number	US-10381682-B2
Application number	US-201615234234-A
Country	US
Kind code	B2
Filing date	Aug 11, 2016
Priority date	Dec 14, 2015
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

More particularly, the sulfide-based solid electrolyte includes lithium sulfide (Li2S), diphosphorus pentasulfide (P2S5), and nickel sulfide (Ni3S2) in a specific ratio by mol % and exhibits a novel crystal structure due to nickel (Ni). Accordingly, the sulfide-based solid electrolyte has greater lithium ion conductivity than an conventional sulfide-based solid electrolyte and a stable crystal structure.

First claim

What is claimed is:

1. A solid electrolyte, comprising lithium sulfide (Li 2 S), diphosphorus pentasulfide (P 2 S 5 ), and nickel sulfide (Ni 3 S 2 ),
wherein a ratio of lithium sulfide (Li 2 S):diphosphorus pentasulfide (P 2 S 5 ):nickel sulfide (Ni 3 S 2 ) is Y:(1−X)(100−Y):X(100−Y) by mol %, and
wherein X is about 0.2 to 0.5, and Y is about 60 to 80 mol %.

2. The solid electrolyte according to claim 1 , wherein X is about 0.4 and Y is about 70 mol %.

3. The solid electrolyte according to claim 1 , wherein X is about 0.5 and Y is about 60 mol %.

4. The solid electrolyte according to claim 2 , wherein a diffraction peak is exhibited at a diffraction angle (20) of about 26±0.5 of X-ray diffraction spectrum.

5. The sulfide-based solid electrolyte according to claim 1 , wherein a mole ratio (Ni/S) of nickel (Ni) to sulfur (S) is about 0.1 to 0.3, and
a mole ratio (Li/S) of lithium (Li) to sulfur (S) is about 0.6 to 0.9.

6. The solid electrolyte according to claim 1 , wherein a mole ratio (P/S) of phosphorus (P) to sulfur (S) is about 0.15 to 0.20, and
a mole ratio (Li/P) of lithium (Li) to phosphorus (P) is about 2.5 to 5.0.

7. The solid electrolyte according to claim 1 , wherein a mole ratio (Li/Ni) of lithium (Li) to nickel (Ni) is about 4 to 5.5, and
a mole ratio (P/Ni) of phosphorus (P) and nickel (Ni) is about 0.8 to 1.3.

8. The solid electrolyte according to claim 1 , wherein a mole ratio (Li/Ni) of lithium (Li) to nickel (Ni) is about 4.5 to 12, and
a mole ratio (P/Ni) of phosphorus (P) to nickel (Ni) is about 1.5 to 2.5.

9. A method of preparing a solid electrolyte, the method comprising:
preparing a mixture comprising lithium sulfide (Li 2 S), diphosphorus pentasulfide (P 2 S 5 ), and nickel sulfide (Ni 3 S 2 ), wherein a ratio of the lithium sulfide (Li 2 S):the diphosphorus pentasulfide (P 2 S 5 ):the nickel sulfide (Ni 3 S 2 ) is Y:(1−X)(100−Y):X(100−Y) by mol %, wherein X is about 0.2 to 0.5, and Y is about 60 to 80 mol %;
grinding the mixture; and
thermally treating the ground mixture.

10. The method according to claim 9 , wherein, the ground mixture is thermally treated at a temperature of about 200 to 1200° C. for about 1 to 3 hours.

11. An all-solid state battery comprising the solid electrolyte according to claim 1 .

12. A vehicle comprising the all-solid state battery of claim 11 .

Assignees

• Hyundai Motor Co Ltd
• Korea Inst Sci & Tech

Inventors

• Jang Yong Jun
• Sung Ju Young
• Lee Yong Sung
• Lee Ho Taek
• Kim Hyoung Chul
• Lee Jong Ho
• Jung Hun Gi
• Cho Soo Young
• Lee Yoon Sung

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M2220/20

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

• H01M10/0525

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

• H01B1/10

  sulfides · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic