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

Patent metadata

Field	Value
Publication number	US-2018277892-A1
Application number	US-201815992522-A
Country	US
Kind code	A1
Filing date	May 30, 2018
Priority date	Dec 11, 2015
Publication date	Sep 27, 2018
Grant date	—

Abstract

Provided are a solid electrolyte composition including an inorganic solid electrolyte, binder particles which include a polymer having an SP value of 10.5 cal1/2 cm−3/2 or more and have an average particle diameter of 10 nm or more and 50,000 nm or less, 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 electrode sheet for an all-solid state secondary battery and the all-solid state secondary battery.

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 include a polymer having an SP value of 10.5 cal 1/2 cm −3/2 or more and have an average particle diameter of 10 nm or more and 50,000 nm or less; and a dispersion medium.

2 . The solid electrolyte composition according to claim 1 ,
wherein the polymer includes a repeating unit derived from a monomer having an SP value of 12 cal 1/2 cm −3/2 or more or a partial structure derived from a condensation component having an SP value of 12 cal 1/2 cm −3/2 or more in an amount of 35% by mass or more and 100% by mass or less of the entire polymer.

3 . The solid electrolyte composition according to claim 1 ,
wherein a glass transition temperature of the polymer is 30° C. or lower.

4 . The solid electrolyte composition according to claim 1 ,
wherein the polymer has, as a side chain component, a repeating unit derived from a macromonomer having a mass-average molecular weight of 1,000 or more.

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

6 . The solid electrolyte composition according to claim 1 ,
wherein the polymer includes a repeating unit derived from at least one of monomers represented by Formulae (a-1) to (a-8),

in the formulae, L 11 represents a single bond or a linking group, X represents —O— or >NH, R 11 represents a hydrogen atom, a hydroxy group, a cyano group, a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, or an aryl group, R 12 and R 14 each independently represent a hydrogen atom or a substituent, R 13 represents a hydrogen atom, an alkyl group, a hydroxy group-containing group, or a carboxy group-containing group; meanwhile, R 13 may be the linking group of L 11 and constitute a dimer at this portion, and R 15 and R 16 each independently represent a substituent.

7 . The solid electrolyte composition according to claim 1 ,
wherein the polymer includes a hydroxy group or a carbamoyl group.

8 . 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.

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

10 . 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.

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 . The solid electrolyte composition according to claim 11 ,
wherein the active material is a transition metal oxide or a metal oxide.

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 . An electrode 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 . 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 include a polymer having an SP value of 10.5 cal 1/2 cm −3/2 or more and have an average particle diameter of 10 nm or more and 50,000 nm or less.

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

17 . A method for manufacturing an all-solid state secondary battery, comprising:
forming an all-solid state secondary battery using the method for manufacturing an electrode sheet for an all-solid state secondary battery according to claim 16 .

Assignees

• Fujifilm Corp

Inventors

• Mimura Tomonori
• Mochizuki Hiroaki
• Makino Masaomi

Classifications

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M4/0457

  from dispersions or suspensions; Electrophoresis · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2300/0082

  Organic polymers · CPC title