Solid electrolyte composition, binder particles, sheet for all-solid state secondary battery, electrode sheet for all-solid state secondary battery, all-solid state secondary battery, and methods for manufacturing same

Patent metadata

Field	Value
Publication number	US-10892515-B2
Application number	US-201815992452-A
Country	US
Kind code	B2
Filing date	May 30, 2018
Priority date	Dec 11, 2015
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

Provided are binder particles which have an average particle diameter of 10 to 50,000 nm and encompass an ion-conductive substance, a solid electrolyte composition including the binder particles, an inorganic solid electrolyte having conductivity for ions of metal elements belonging to Group I or II of the periodic table, and a dispersion medium, a sheet for an all-solid state secondary battery, an electrode sheet for an all-solid state secondary battery, and an all-solid state secondary battery for which the same solid electrolyte composition is used, and methods for manufacturing the same.

First claim

What is claimed is:

1. A solid electrolyte composition comprising:
an inorganic solid electrolyte having conductivity for ions of metal elements belonging to Group I or II of the periodic table;
binder particles which have an average particle diameter of 10 nm or more and 50,000 nm or less and encompass an ion-conductive substance; and
a dispersion medium,
wherein the binder particles are formed of the ion-conductive substance and a polymer, and the ion-conductive substance is coated with the polymer having a mass ratio of 5% or more and 100% or less of the ion-conductive substance, and
wherein the ion-conductive substance is coated with the polymer having a mass ratio of 30% or more and 100% or less of the ion-conductive substance.

2. The solid electrolyte composition according to claim 1 ,
wherein the ion-conductive substance is an inorganic solid electrolyte or a liquid electrolyte.

3. The solid electrolyte composition according to claim 1 ,
wherein the ion-conductive substance is an inorganic solid electrolyte or a liquid electrolyte including a liquid having a boiling point of 100° C. or higher or an ionic liquid and a Li salt.

4. The solid electrolyte composition according to claim 1 ,
wherein a polymer forming the binder particles is a polyamide, a polyimide, a polyurea, a urethane resin, or an acrylic resin.

5. The solid electrolyte composition according to claim 1 ,
wherein a Clog P value of the dispersion medium is 1 or more.

6. The solid electrolyte composition according to claim 1 ,
wherein a polymer forming the binder particles has a repeating unit derived from a monomer having an SP value of 11 (cal 1/2 cm −3/2 ) or more or a partial structure derived from a condensation component having an SP value of 11 (cal 1/2 cm −3/2 ) or more.

7. The solid electrolyte composition according to claim 6 ,
wherein a content of the repeating unit or the partial structure in the polymer is 10% by mass or more.

8. The solid electrolyte composition according to claim 1 ,
wherein a mass ratio between the ion-conductive substance and a polymer forming the binder particles is 1:1 to 10.

9. The solid electrolyte composition according to claim 1 ,
wherein the dispersion medium is selected from an ether compound solvent, an aromatic compound solvent, and an aliphatic compound solvent.

10. The solid electrolyte composition according to claim 1 ,
wherein the inorganic solid electrolyte is represented by Formula (1),
L a1 M b1 P c1 S d1 A e1   (1)

in the formula, L represents an element selected from Li, Na, and K, M represents an element selected from B, Zn, Sn, Si, Cu, Ga, Sb, Al, and Ge, A represents I, Br, Cl, or F, a1 to e1 represent the compositional ratios among the respective elements, and a1:b1:c1:d1:e1 satisfies 1 to 12:0 to 5:1:2 to 12:0 to 10.

11. The solid electrolyte composition according to claim 1 , further comprising:
an active material capable of intercalating and deintercalating ions of metal elements belonging to Group I or Group II of the periodic table.

12. A method for manufacturing the solid electrolyte composition according to claim 1 , comprising:
a step of mixing the inorganic solid electrolyte and the binder particles.

13. A sheet for an all-solid state secondary battery, comprising:
a film of the solid electrolyte composition according to claim 1 formed on a base material.

14. A sheet for an all-solid state secondary battery, comprising:
a film of the solid electrolyte composition according to claim 11 formed on a metal foil.

15. A method for manufacturing an electrode sheet for an all-solid state secondary battery, comprising:
a step of forming a film of the solid electrolyte composition according to claim 11 on a metal foil.

16. The method for manufacturing an electrode sheet for an all-solid state secondary battery according to claim 15 , further comprising:
a step of encompassing an ion-conductive substance in a polymer forming binder particles so as to prepare the binder particles, and then, mixing an active material, an inorganic solid electrolyte, the binder particles, and a dispersion medium to prepare a solid electrolyte composition.

17. A method for manufacturing the sheet for an all-solid state secondary battery according to claim 13 , comprising:
a step of mixing an inorganic solid electrolyte, binder particles, and a dispersion medium to prepare a solid electrolyte composition.

18. A method for manufacturing an all-solid state secondary battery, comprising:
manufacturing an all-solid state secondary battery using the method for manufacturing an electrode sheet for an all-solid state secondary battery according to claim 15 .

19. A method for manufacturing an all-solid state secondary battery, comprising:
manufacturing an all-solid state secondary battery using the method for manufacturing the sheet for an all-solid state secondary battery according to claim 17 .

20. The solid electrolyte composition according to claim 8 ,
wherein the mass ratio between the ion-conductive substance and the polymer forming the binder particles is 1:1.5 to 8.

21. A solid electrolyte composition comprising:
an inorganic solid electrolyte having conductivity for ions of metal elements belonging to Group I or II of the periodic table;
binder particles which have an average particle diameter of 10 nm or more and 50,000 nm or less and encompass an ion-conductive substance; and
a dispersion medium,
wherein the binder particles are formed of the ion-conductive substance and a polymer, and the ion-conductive substance is coated with the polymer having a mass ratio of 5% or more and 100% or less of the ion-conductive substance, and
wherein the mass ratio between the ion-conductive substance and the polymer forming the binder particles is 1:1.5 to 8.

Assignees

• Fujifilm Corp

Inventors

• Mimura Tomonori
• Mochizuki Hiroaki
• Makino Masaomi

Classifications

• H01M2300/0082

  Organic polymers · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/622

  being polymers · CPC title

• H01B1/06

  mainly consisting of other non-metallic substances · CPC title