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

Patent metadata

Field	Value
Publication number	US-2016365604-A1
Application number	US-201615245500-A
Country	US
Kind code	A1
Filing date	Aug 24, 2016
Priority date	Feb 25, 2014
Publication date	Dec 15, 2016
Grant date	—

Abstract

A solid electrolyte composition includes an inorganic solid electrolyte, a binder which is formed of core-shell type particles which have a core section and a shell section, and a dispersive medium, in which a difference between a glass transition temperature of a polymer compound which forms the core section and a glass transition temperature of a polymer compound which forms the shell section is 50° C. or more.

First claim

What is claimed is:

1 . A solid electrolyte composition comprising:
an inorganic solid electrolyte; a binder which is formed of core-shell type particles which have a core section and a shell section; and a dispersive medium, wherein a difference between a glass transition temperature of a polymer compound which forms the core section and a glass transition temperature of a polymer compound which forms the shell section is 50° C. or more.

2 . The solid electrolyte composition according to claim 1 ,
wherein the polymer compound which forms the binder includes a structure unit which is represented by Formula (1) or (2) below,

in the formulas, W 1 to W 4 each independently represent a single bond or a divalent linking group,
Z 11 to Z 14 and Z 21 to Z 24 each independently represent a hydrogen atom or a substituent,
where, at least one of Z 11 , . . . . , or Z 14 and at least one of Z 21 , . . . , or Z 24 are a substituent,
W 1 to W 4 , Z 11 to Z 14 , and Z 21 to Z 24 may bond with each other to form a cyclic structure, and
Z 11 to Z 14 and Z 21 to Z 24 may be linked with another polymer chain which is represented by Formula (1) or (2).

3 . The solid electrolyte composition according to claim 1 ,
wherein an average particle diameter of the core-shell type particles which form the binder is 10 nm or more and 1,000 nm or less.

4 . The solid electrolyte composition according to claim 1 ,
wherein the polymer compound which forms the binder includes a structure unit which is derived from a macromonomer (X) with a weight-average molecular weight of 1,000 or more.

5 . The solid electrolyte composition according to claim 1 ,
wherein the polymer compound which forms the binder has at least one selected from the group (b) of functional groups below, group (b) of functional groups a carbonyl group, an amino group, a carboxyl group, a sulfonic acid group, a phosphoric acid group, a phosphonic acid group, a hydroxy group, an oxy group, a cyano group, a sulfide group, and an imino group.

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

7 . The solid electrolyte composition according to claim 4 ,
wherein the macromonomer (X) includes a polymerizable double bond and a linear hydrocarbon structure unit with 6 or more carbon atoms.

8 . The solid electrolyte composition according to claim 4 ,
wherein the macromonomer (X) is a monomer which is represented by any one of Formulas (b-13a) to (b-13c) below or a monomer which has a repeating unit which is represented by any one of Formulas (b-14a) to (b-14c) below,

in the formulas, R b2 and R b3 each independently represent 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,
Ra and Rb each independently represent a linking group,
where, Ra is a monovalent substituent when na is 1,
na represents an integer of 1 to 6, and
R N is a hydrogen atom, an alkyl group with 1 to 6 carbon atoms, or an aryl group with 6 to 10 carbon atoms.

9 . The solid electrolyte composition according to claim 1 ,
wherein the glass transition temperature of the core section of the binder is higher than the glass transition temperature of the shell section, or the glass transition temperature of the shell section of the binder is higher than the glass transition temperature of the core section.

10 . The solid electrolyte composition according to claim 1 ,
wherein the glass transition temperature of the core section of the binder is 80° C. or more and the glass transition temperature of the shell section is 30° C. or less, or the glass transition temperature of the shell section of the binder is 80° C. or more and the glass transition temperature of the core section is 30° C. or less.

11 . The solid electrolyte composition according to claim 1 ,
wherein the average particle diameter of the core-shell type particles which form the binder is 200 nm or less.

12 . The solid electrolyte composition according to claim 1 ,
wherein the polymer compound which forms the binder has at least one selected from the group (c) of functional groups below, group (c) of functional groups a carboxyl group, a sulfonic acid group, a phosphoric acid group, and a hydroxy group.

13 . The solid electrolyte composition according to claim 1 , further comprising:
an active material which is able to insert and discharge metal ions which belong to group I or group II in the periodic table.

14 . The solid electrolyte composition according to claim 1 ,
wherein the binder particles are contained at 0.1 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the inorganic solid electrolyte.

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

16 . The solid electrolyte composition according to claim 1 ,
wherein a ratio of a mass of the binder core section and a mass of the shell section is 5 parts by mass or more and 200 parts by mass or less of the shell section with respect to 100 parts by mass of the core section.

17 . An electrode sheet for a battery where the solid electrolyte composition according to claim 1 is formed into a film on a metallic foil.

18 . An all-solid secondary battery comprising:
a cathode active material layer; an anode active material layer; and an inorganic solid electrolyte layer, wherein at least one of the cathode active material layer, the anode active material layer, or the inorganic solid electrolyte layer is formed of the solid electrolyte composition according to claim 1 .

19 . A method for manufacturing an electrode sheet for a battery, the method comprising:
arranging the solid electrolyte composition according to claim 1 on a metallic foil, and forming the composition into a film.

20 . A method for manufacturing an all-solid secondary battery via the manufacturing method according to claim 19 .

Assignees

• Fujifilm Corp

Inventors

• Mimura Tomonori
• Mochizuki Hiroaki
• Makino Masaomi
• Meguro Katsuhiko

Classifications

• H01M10/0525

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

• C08F265/06

  Polymerisation of acrylate or methacrylate esters on to polymers thereof · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title