Solid electrolyte material and all solid-state lithium secondary battery

Patent metadata

Field	Value
Publication number	US-9397365-B2
Application number	US-201113636899-A
Country	US
Kind code	B2
Filing date	Mar 25, 2011
Priority date	Mar 26, 2010
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

A solid electrolyte material for an all solid-state lithium secondary battery represented by Li 2 S-M I a S b -M II x O y , wherein M I is selected from P, Si, Ge, B and Al; “a” and “b” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of M I ; M II is selected from Fe, Zn and Bi; and “x” and “y” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of M II .

First claim

What is claimed is:

1. A solid electrolyte material for an all solid-state lithium secondary battery represented by Li 2 S-M I a S b -M II x O y ,
wherein:
M I is selected from P, Si, Ge, B and Al;
“a” and “b” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of M I ;
M II , “x,” and “y” are selected such that M II x O y is Bi 2 O 3 ;
M II x O y is less stable than M II x S y ;
the Li 2 S-M I a S b -M II x O y has a composition in which the ratio of M II x O y to the total of Li 2 S and M I a S b is 60:40 to 95:5 (mole ratio); and
said solid electrolyte material is:
(i) used for the all solid-state lithium secondary battery comprising a positive electrode, a solid electrolyte layer, and a negative electrode;
(ii) contained in any of the positive electrode, the solid electrolyte layer, and the negative electrode; and
(iii) capable of suppressing generation of hydrogen sulfide.

2. The solid electrolyte material for an all solid-state lithium secondary battery of claim 1 , wherein the M I a S b is P 2 S 5 .

3. The solid electrolyte material for an all solid-state lithium secondary battery of claim 1 , wherein the Li 2 S-M I a S b -M II x O y has a composition in which the ratio of Li 2 S and M I a S b is 50:50 to 90:10 (mole ratio).

4. An all solid-state lithium secondary battery comprising: a positive electrode; a negative electrode; and a solid electrolyte layer interposed between the positive electrode and the negative electrode, the solid electrolyte layer containing the solid electrolyte material of claim 1 .

5. The all solid-state lithium secondary battery of claim 4 , wherein at least one of the positive electrode and the negative electrode further contains the solid electrolyte material for the all solid-state lithium secondary battery.

6. The solid electrolyte material for an all solid-state lithium secondary battery of claim 1 , wherein M I , “a,” and “b” are selected such that M I a S b is Al 2 S 3 .

7. A solid electrolyte material for an all solid-state lithium secondary battery represented by Li 2 S-M I a S b -M II x O y ,
wherein M I is selected from P, Si, Ge, B and Al;
“a” and “b” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of M I ;
M II is selected from Fe, Zn, and Bi;
“x” and “y” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of M II ; and
the Li 2 S-M I a S b -M II x O y has a composition in which the ratio of M II x O y to the total of Li 2 S and M I a S b is 60:40 to 95:5 (mole ratio).

8. An all solid-state lithium secondary battery, comprising:
a positive electrode;
a negative electrode;
a solid electrolyte layer interposed between the positive electrode and the negative electrode; and
a solid electrolyte material contained in the solid electrolyte layer and throughout at least one of the positive electrode and the negative electrode, wherein:
the solid electrolyte material is represented by Li 2 S-M I a S b -M II x O y , in which:
M I is selected from P, Si, Ge, B and Al;
“a” and “b” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of M I ;
M II is selected from Fe, Zn, and Bi; and
“x” and “y” respectively represent numbers that give a stoichiometric ratio in accordance with the kind of M II ; and
the Li 2 S-M I a S b -M II x O y has a composition in which the ratio of M II x O y to the total of Li 2 S and M I a S b is 60:40 to 95:5 (mole ratio).

9. The solid electrolyte material for an all solid-state lithium secondary battery of claim 7 , wherein the M II x O y is selected from Fe 2 O 3 , ZnO and Bi 2 O 3 .

10. The solid electrolyte material for an all solid-state lithium secondary battery of claim 7 , wherein the M I a S b is P 2 S 5 .

11. The solid electrolyte material for an all solid-state lithium secondary battery of claim 7 , wherein the Li 2 S-M I a S b -M II x O y has a composition in which the ratio of Li 2 S and M I a S b is 50:50 to 90:10 (mole ratio).

12. An all solid-state lithium secondary battery comprising: a positive electrode; a negative electrode; and a solid electrolyte layer interposed between the positive electrode and the negative electrode, the solid electrolyte layer containing the solid electrolyte material of claim 7 .

13. The all solid-state lithium secondary battery of claim 12 , wherein at least one of the positive electrode and the negative electrode further contains the solid electrolyte material for the all solid-state lithium secondary battery.

Assignees

• Tatsumisago Masahiro
• Hayashi Akitoshi
• Hama Shigenori
• Kawamoto Koji
• Ohtomo Takamasu
• Toyota Motor Co Ltd

Inventors

• Tatsumisago Masahiro
• Hayashi Akitoshi
• Hama Shigenori
• Kawamoto Koji
• Ohtomo Takamasu

Classifications

• H01M2300/0068

  inorganic · CPC title

• H01M10/0562

  Solid materials · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M10/052 Primary

  Li-accumulators · CPC title