Binder composition for all-solid state secondary battery, solid electrolyte composition, solid electrolyte-containing sheet, all-solid state secondary battery, method of manufacturing solid electrolyte-containing sheet, and method of manufacturing all-solid state secondary battery

Patent metadata

Field	Value
Publication number	US-11489163-B2
Application number	US-202016842767-A
Country	US
Kind code	B2
Filing date	Apr 8, 2020
Priority date	Oct 12, 2017
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

Provided are a binder composition for an all-solid state secondary battery, a solid electrolyte-containing sheet, an all-solid state secondary battery, and a method of manufacturing a solid electrolyte-containing sheet, and a method of manufacturing an all-solid state secondary battery. The binder composition for an all-solid state secondary battery includes polymer particles (A) and a non-aqueous dispersion medium (B), in which the polymer particles (A) are formed of a graft polymer not including a surfactant and having two or more peaks in a scattering intensity distribution measured by a dynamic light scattering particle size distribution analyzer, and a moisture content of the composition is 100 ppm or lower by mass.

First claim

What is claimed is:

1. A binder composition for an all-solid state secondary battery comprising polymer particles (A) and a non-aqueous dispersion medium (B),
wherein the polymer particles (A) are formed of a graft polymer not including a surfactant and having two or more peaks in a scattering intensity distribution measured by a dynamic light scattering particle size distribution analyzer, and
a moisture content of the composition is 100 ppm or lower by mass.

2. The binder composition for an all-solid state secondary battery according to claim 1 ,
wherein among the two or more peaks in the scattering intensity distribution, a peak (Pa) of a minimum particle size is in a range of 10 nm or more and less than 200 nm and a peak (Pb) of a maximum particle size is in a range of 200 rim or more and less than 1000 rim.

3. The binder composition for an all-solid state secondary battery according to claim 2 ,
wherein a relationship between the peak (Pa) of the minimum particle size and the peak (Pb) of the maximum particle size satisfies the following Expression (1),
0.05≤ Pa/Pb≤ 0.75  (1).

4. The binder composition for an all-solid state secondary battery according to claim 1 ,
wherein the polymer particles (A) include a repeating unit derived from a (meth)acrylic acid ester.

5. The binder composition for an all-solid state secondary battery according to claim 1 ,
wherein the polymer particles (A) are formed of a graft polymer having at least one functional group selected from the following group of functional groups,
Group of Functional Groups
a hydroxy group, a carboxy group or a salt thereof, a sulfonate group or a salt thereof, a phosphate group or a salt thereof, a cyano group, and an amino group or a salt thereof.

6. The binder composition for an all-solid state secondary battery according to claim 1 ,
wherein a graft portion of the polymer particles (A) has an alkyl group having 6 to 18 carbon atoms.

7. The binder composition for an all-solid state secondary battery according to claim 1 ,
wherein the non-aqueous dispersion medium (B) is at least one of a hydrocarbon compound solvent, a ketone compound solvent, an ether compound solvent, an ester compound solvent, or a nitrile compound solvent.

8. The binder composition for an all-solid state secondary battery according to claim 1 , further comprising an inorganic solid electrolyte (C) having ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table.

9. The binder composition for an all-solid state secondary battery according to claim 8 , further comprising an active material (D).

10. The binder composition for an all-solid state secondary battery according to claim 8 , further comprising a conductive auxiliary agent (E).

11. A solid electrolyte-containing sheet comprising a layer that is formed of the binder composition for an all-solid state secondary battery according to claim 8 .

12. An all-solid state secondary battery comprising a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer,
wherein at least one of the positive electrode active material layer, the negative electrode active material layer, or the solid electrolyte layer is the solid electrolyte-containing sheet according to claim 11 .

13. A method of manufacturing a solid electrolyte-containing sheet comprising a step of applying the binder composition for an all-solid state secondary battery according to claim 8 to a substrate.

14. A method of manufacturing an all-solid state secondary battery comprising a step of manufacturing a solid electrolyte-containing sheet through the method according to claim 13 .

Assignees

• Fujifilm Corp

Inventors

• Makino Masaomi
• Mochizuki Hiroaki
• Mimura Tomonori

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M10/0562

  Solid materials · CPC title