Solid electrolyte composition, sheet for all-solid state secondary battery, electrode sheet for all-solid state secondary battery, and all-solid state secondary battery

Patent metadata

Field	Value
Publication number	US-12034115-B2
Application number	US-202117225126-A
Country	US
Kind code	B2
Filing date	Apr 8, 2021
Priority date	Oct 11, 2018
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

There is provided a solid electrolyte composition containing an inorganic solid electrolyte having ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table and a binder containing non-spherical binder particles consisting of secondary particles formed of primary particles having an average particle size of 1 to 1,000 nm. There are also provided an all-solid state secondary battery, an electrode sheet for an all-solid state secondary battery, and an all-solid state secondary battery, which have a layer constituted of this composition.

First claim

What is claimed is:

1. A solid electrolyte composition comprising: an inorganic solid electrolyte having ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table; and a binder consisting of a polymer, wherein the binder contains non-spherical binder particles which consist of secondary particles formed of primary particles having an average primary particle size of 1 nm to 1,000 nm.

2. The solid electrolyte composition according to claim 1 ,
wherein the secondary particles have an average particle size of 2 to 1,000 times the average primary particle size.

3. The solid electrolyte composition according to claim 1 ,
wherein the secondary particle has an aspect ratio of 1.1 to 1,000.

4. The solid electrolyte composition according to claim 1 ,
wherein the polymer exhibits a breaking elongation of 10% or more.

5. The solid electrolyte composition according to claim 1 , further comprising a dispersion medium.

6. The solid electrolyte composition according to claim 1 , further comprising an active material.

7. The solid electrolyte composition according to claim 6 ,
wherein the active material is an active material that is capable of being alloyed with lithium.

8. The solid electrolyte composition according to claim 1 ,
wherein the polymer contains at least one functional group selected from Group (a) of functional groups,
wherein the Group (a) of functional groups comprises:
an acidic functional group, a basic functional group, a hydroxy group, a cyano group, an alkoxysilyl group, an aryl group, a heteroaryl group, and an aliphatic hydrocarbon ring group in which 3 or more rings are fused.

9. The solid electrolyte composition according to claim 1 ,
wherein the polymer is polyamide, polyimide, polyurea, polyurethane, or a (meth)acrylic polymer.

10. The solid electrolyte composition according to claim 1 ,
wherein the inorganic solid electrolyte is a sulfide-based solid electrolyte.

11. A sheet for an all-solid state secondary battery, comprising a layer formed of the solid electrolyte composition according to claim 1 .

12. An electrode sheet for an all-solid state secondary battery, the sheet comprising an active material layer formed of the solid electrolyte composition according to claim 6 .

13. An all-solid state secondary battery comprising, in the following order:
a positive electrode active material layer;
a solid electrolyte layer; and
a negative electrode active material layer,
wherein at least one of the positive electrode active material layer, the negative electrode active material layer, or the solid electrolyte layer is a layer formed of the solid electrolyte composition according to claim 1 .

14. The all-solid state secondary battery according to claim 13 ,
wherein the negative electrode active material layer is a layer formed of a solid electrolyte composition comprising:
an inorganic solid electrolyte having ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table;
a binder formed of a polymer, wherein the binder contains non-spherical binder particles consisting of secondary particles formed of primary particles having an average primary particle size of 1 to 1,000 nm; and
an active material.

15. The all-solid state secondary battery according to claim 14 ,
wherein the active material is an active material that is capable of being alloyed with lithium.

16. The solid electrolyte composition according to claim 1 , wherein an average length of the secondary particles is in a range of 20 nm to 1,000 nm, and an average width of the secondary particles is in a range of 10 nm to 500 nm.

17. The solid electrolyte composition according to claim 1 , wherein the secondary particles have an average particle size that is 2 times or more and 25 times or less of the average primary particle size.

18. The solid electrolyte composition according to claim 1 , wherein an average length of the secondary particles is in a range of 20 nm to 1,000 nm, and an average width of the secondary particles is in a range of 10 nm to 500 nm, and the secondary particles have an average particle size that is 2 times or more and 25 times or less of the average primary particle size.

Assignees

• Fujifilm Corp

Inventors

• Mochizuki Hiroaki
• Mimura Tomonori
• Kushida Yo

Classifications

• H01M2300/0068

  inorganic · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/622

  being polymers · CPC title

• C08L75/08

  from polyethers · CPC title

• C08K2003/3009

  Sulfides · CPC title