Nitrogen-doped sulfide-based solid electrolyte for all-solid batteries

Patent metadata

Field	Value
Publication number	US-2019198917-A1
Application number	US-201816163247-A
Country	US
Kind code	A1
Filing date	Oct 17, 2018
Priority date	Dec 27, 2017
Publication date	Jun 27, 2019
Grant date	—

Abstract

The present invention relates to a nitrogen-doped sulfide-based solid electrolyte for all-solid batteries. The a nitrogen-doped sulfide-based solid electrolyte for all-solid batteries includes a compound with an argyrodite-type crystal structure represented by the following Formula 1:
Li a PS b N c X d   [Formula 1]
wherein 6≤a≤7, 3<b<6, 0<c≤1, 0<d≤2, and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

First claim

What is claimed is:

1 . A solid electrolyte for all-solid batteries comprising:
a compound represented by the following Formula 1:
Li a PS b N c X d   [Formula 1]

wherein in Formula 1, 6≤a≤7, 3<b<6, 0<c≤1, 0<d≤2; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I), wherein the compound has an argyrodite-type crystal structure.

2 . The solid electrolyte of claim 1 , wherein the compound is represented by the following Formula 2:
Li 6+a PS 5−a N a X  [Formula 2]
wherein in Formula 2, 0<a≤1; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

3 . The solid electrolyte of claim 1 , wherein the compound is represented by the following Formula 3.
Li 6 PS 5−1.5b N b X[Formula 3] wherein in Formula 3, 0<b≤0.75; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

4 . The solid electrolyte of claim 1 , wherein the compound is represented by the following Formula 4:
Li 7 PS 6−2c N c X c   [Formula 4]
wherein in Formula 4, 0<c≤1; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

5 . The solid electrolyte of claim 1 , wherein the compound is represented by the following Formula 5:
Li 6 PS 5−2d N d X 1+d   [Formula 5]
wherein in Formula 5, 0<d≤1; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

6 . An all-solid battery comprising:
a cathode; an anode; and a solid electrolyte layer interposed between the cathode and the anode, wherein at least one of the cathode, the anode and the solid electrolyte layer comprises a solid electrolyte of claim 1 .

7 . A method of manufacturing a solid electrolyte for all-solid batteries comprising:
providing a mixture of Li 2 S, P 2 S 5 , LiX and Li 3 N; grinding the mixture; and heat-treating the mixture to obtain a compound having an argyrodite-type crystal structure, wherein each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

8 . The method of claim 7 , wherein the compound is represented by the following Formula 1:
Li a PS b N c X d   [Formula 1]
wherein in Formula 1, 6≤a≤7, 3<b<6, 0<c≤1, 0<d≤2; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

9 . The method of claim 7 , wherein the compound is represented by the following Formula 2:
Li 6+a PS 5−a N a X  [Formula 2]
wherein in Formula 2, 0≤a≤1; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

10 . The method of claim 7 , wherein the compound is represented by the following Formula 3.
Li 6 PS 5−1.5b N b X[Formula 3] wherein in Formula 3, 0<b≤0.75; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

11 . The method of claim 7 , wherein the compound is represented by the following Formula 4:
Li 7 PS 6−2c N c X c   [Formula 4]
wherein in Formula 4, 0<c≤1; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

12 . The method of claim 7 , wherein the compound is represented by the following Formula 5:
Li 6 PS 5−2d N d X 1+d   [Formula 5]
wherein in Formula 5, 0<d≤1; and each X is the same or different halogen atom selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

13 . A vehicle comprising an all-solid battery of claim 6 .

Assignees

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

Inventors

• Seong Ju Yeong
• Jang Yong Jun
• Min Hong Seok
• Kim Sa Heum
• Yoon Yong Sub
• Oh Pil Gun
• Shin Dong Wook
• Park Chan Hwi
• Son Jin Oh

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• C01B25/10 Primary

  Halides or oxyhalides of phosphorus · CPC title

• C01P2002/72

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

• C01P2006/40

  Electric properties · CPC title

• C01B25/14

  Sulfur, selenium, or tellurium compounds of phosphorus · CPC title