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-2021091409-A1
Application number	US-202017112838-A
Country	US
Kind code	A1
Filing date	Dec 4, 2020
Priority date	Dec 11, 2015
Publication date	Mar 25, 2021
Grant date	—

Abstract

An all-solid state secondary battery including: a positive electrode active material layer; a solid electrolyte layer; and a negative electrode active material layer in this order. At least one of the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer is a layer including an inorganic solid electrolyte having conductivity for ions of metal elements belonging to Group I or II of the periodic table and 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. 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 30% or more and 100% or less of the ion-conductive substance.

First claim

What is claimed is:

1 . An all-solid state secondary battery comprising:
a positive electrode active material layer; a solid electrolyte layer; and a negative electrode active material layer in this order, wherein at least one of the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer is a layer including an inorganic solid electrolyte having conductivity for ions of metal elements belonging to Group I or II of the periodic table and 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, 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 30% or more and 100% or less of the ion-conductive substance.

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

3 . The all-solid state secondary battery 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 all-solid state secondary battery 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 all-solid state secondary battery 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.

6 . The all-solid state secondary battery according to claim 5 ,
wherein a content of the repeating unit or the partial structure in the polymer is 10% by mass or more.

7 . The all-solid state secondary battery 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.

8 . The all-solid state secondary battery 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.

9 . The all-solid state secondary battery according to claim 7 ,
wherein the mass ratio between the ion-conductive substance and the polymer forming the binder particles is 1:1.5 to 8.

10 . The all-solid state secondary battery according to claim 1 ,
wherein the solid electrolyte composition further comprises a dispersion medium, 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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M10/0585

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

• C08L75/04

  Polyurethanes · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title