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

Patent metadata

Field	Value
Publication number	US-2016204465-A1
Application number	US-201615075589-A
Country	US
Kind code	A1
Filing date	Mar 21, 2016
Priority date	Sep 25, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

Provided is a solid electrolyte composition including: an inorganic solid electrolyte (A) having conductivity of an ion of metal belong to Group 1 or 2 in the periodic table; binder particles (B) which is formed of a polymer combined with a macromonomer (X) including a side chain component having a number average molecular weight of 1,000 or greater, and which has an average diameter of 10 nm to 1,000 nm, and a dispersion medium (C).

First claim

What is claimed is:

1 . A solid electrolyte composition comprising:
an inorganic solid electrolyte (A) having conductivity of an ion of metal belong to Group 1 or 2 in the periodic table; binder particles (B) formed of a polymer combined with a macromonomer (X) having a number average molecular weight of 1,000 or greater, as a side chain component, and which has an average diameter of 10 nm to 1,000 nm; and a dispersion medium (C).

2 . The solid electrolyte composition according to claim 1 ,
wherein a polymer that forms in the binder particles (B) is amorphous.

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

4 . The solid electrolyte composition according to claim 1 ,
wherein the polymer forming the binder particle has at least one functional group in a group of functional groups (b). Group of functional groups (b) a carbonyl group, an amino group, a sulfonic acid group, a phosphoric acid group, a hydroxy group, an ether group, a cyano group, and a thiol group

5 . The solid electrolyte composition according to claim 1 ,
wherein a carbonyl group is included in the polymer forming the binder particle.

6 . The solid electrolyte composition according to claim 1 ,
wherein a polymer forming the binder particle includes a repeating unit derived from a monomer selected from a (meth)acrylic acid monomer, a (meth)acrylic acid ester monomer, and (meth)acrylonitrile.

7 . The solid electrolyte composition according to claim 1 ,
wherein an average diameter of the binder particles (B) is 200 nm or lower.

8 . The solid electrolyte composition according to claim 1 ,
wherein a ratio of a repeating unit derived from the macromonomer (X) in the polymer forming the binder particles (B) is 50 mass % or lower or 1 mass % or greater.

9 . The solid electrolyte composition according to claim 1 ,
wherein a SP value of the macromonomer (X) is 10 or lower.

10 . The solid electrolyte composition according to claim 1 ,
wherein the macromonomer (X) includes a polymerizable double bond and a straight chain hydrocarbon structure unit having 6 or more carbon atoms.

11 . The solid electrolyte composition according to claim 1 ,
wherein the macromonomer (X) is a monomer expressed by any one of Formulae (b-13a) to (b-13c) below or a monomer having a repeating unit expressed by any one of Formulae (b-14a) to (b-14c),

in the formulae, each of R b2 and R b3 independently 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, each of Ra and Rb independently represents a linking group, but, when na is 1, Ra is a univalent substituent, na represents an integer of 1 to 6, and R N is a hydrogen atom or a substituent.

12 . The solid electrolyte composition according to claim 1 , further comprising:
an active substance that can insert or emit an ion of metal belonging to Group 1 or 2 of the periodic table.

13 . The solid electrolyte composition according to claim 1 ,
wherein a content of the binder particles (B) is 0.1 parts by mass to 20 parts by mass with respect to 100 parts by mass of the solid electrolyte (A).

14 . The solid electrolyte composition according to claim 1 ,
wherein the dispersion medium (C) is selected from an alcohol compound solvent, an ether compound solvent, an amide compound solvent, a ketone compound solvent, an aromatic compound solvent, an aliphatic compound solvent, and a nitrile compound solvent.

15 . An electrode sheet for batteries, obtained by forming a film of the solid electrolyte composition according to claim 1 on metallic foil.

16 . An all-solid-state secondary battery comprising:
a positive electrode active substance layer; a negative electrode active substance layer; and a solid electrolyte layer, wherein at least any one of the positive electrode active substance layer, the negative electrode active substance layer, and the solid electrolyte layer is a layer comprising: an inorganic solid electrolyte (A) having conductivity of an ion of metal belong to Group 1 or 2 in the periodic table; and binder particles (B) formed of a polymer combined with a macromonomer (X) having a number average molecular weight of 1,000 or greater, as a side chain component, and which has an average diameter of 10 nm to 1,000 nm.

17 . A method of manufacturing an electrode sheet for batteries, comprising:
disposing the solid electrolyte composition according to claim 1 on a metallic foil; and forming a film with the solid electrolyte composition.

18 . A method of manufacturing an all-solid-state secondary battery comprising:
manufacturing an all-solid-state secondary battery using the method of manufacturing an electrode sheet for batteries according to claim 17 .

Assignees

• Fujifilm Corp

Inventors

• Mimura Tomonori
• Mochizuki Hiroaki
• Makino Masaomi

Classifications

• H01M10/0562

  Solid materials · CPC title

• C08F290/12

  Polymers provided for in subclasses C08C or C08F · CPC title

• H01M4/13

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

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• H01M2300/0068

  inorganic · CPC title