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

Patent metadata

Field	Value
Publication number	US-2017346075-A1
Application number	US-201715680693-A
Country	US
Kind code	A1
Filing date	Aug 18, 2017
Priority date	Feb 20, 2015
Publication date	Nov 30, 2017
Grant date	—

Abstract

Provided are a solid electrolyte composition including an inorganic solid electrolyte, binder particles, and a dispersion medium, in which the inorganic solid electrolyte has a conductivity of ions of metals belonging to Group I or II of the periodic table and includes a sulfur atom, and the binder particles are constituted of a polymer having a macromonomer having a mass average molecular weight of 1,000 or more combined therewith as a side chain component and having at least one group from a group of functional groups (b) below, an electrode sheet for a battery and an all solid state secondary battery which are produced using the solid electrolyte composition, a method for manufacturing an electrode sheet for a battery, and a method for manufacturing an all solid state secondary battery.
group of functional groups (b) a carboxyl group, a sulfonic acid group, a phosphoric acid group, and a phosphonic acid group.

First claim

What is claimed is:

1 . A solid electrolyte composition comprising:
an inorganic solid electrolyte; binder particles; and a dispersion medium, wherein the inorganic solid electrolyte has a conductivity of ions of metals belonging to Group I or II of the periodic table and includes a sulfur atom, and the binder particles are constituted of a polymer having a macromonomer having a mass average molecular weight of 1,000 or more combined therewith as a side chain component and having at least one group from a group of functional groups (b) below, group of functional groups (b): a carboxyl group, a sulfonic acid group, a phosphoric acid group, and a phosphonic acid group.

2 . The solid electrolyte composition according to claim 1 ,
wherein a polymer constituting the binder particles has a carboxyl group.

3 . The solid electrolyte composition according to claim 1 ,
wherein the polymer constituting the binder particles is a carboxyl group-containing polymer, and the carboxyl group-containing polymer contains 0.1% to 10% by mass of a repeating unit having a carboxyl group.

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

5 . The solid electrolyte composition according to claim 1 ,
wherein an average particle diameter of the binder particles is 10 nm or more and 1,000 nm or less.

6 . The solid electrolyte composition according to claim 1 ,
wherein the average particle diameter of the binder particles is 300 nm or less.

7 . The solid electrolyte composition according to claim 1 ,
wherein a proportion of a repeating unit derived from the macromonomer in the polymer constituting the binder particles is 1% by mass or more and 50% by mass or less.

8 . The solid electrolyte composition according to claim 1 ,
wherein the inorganic solid electrolyte is represented by Formula (1),
L a M b P c S d A e   Formula (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, a to e represent compositional ratios of individual elements, and a:b:c:d:e satisfies 1 to 12:0 to 1:1:2 to 12:0 to 5).

9 . The solid electrolyte composition according to claim 8 ,
wherein L in the inorganic solid electrolyte is Li.

10 . The solid electrolyte composition according to claim 1 ,
wherein an SP value of the macromonomer is 10 or less.

11 . The solid electrolyte composition according to claim 1 ,
wherein a glass transition temperature of the polymer constituting the binder particles is 130° C. or lower.

12 . The solid electrolyte composition according to claim 1 ,
wherein the inorganic solid electrolyte is represented by Formula (2),
Li l P m S n   Formula (2)

in the formula, 1 to n represent compositional ratios of individual elements, and l:m:n satisfies 2 to 4:1:3 to 10.

13 . The solid electrolyte composition according to claim 1 ,
wherein the macromonomer includes a polymerizable double bond and a hydrocarbon structural unit having 6 or more carbon atoms.

14 . The solid electrolyte composition according to claim 1 ,
wherein the macromonomer is a compound represented by any one of Formulae (N-1) to (N-3),

P represents a polymerizable group, L 11 to L 17 each independently represent a linking group, k1, k2, k3, k12, and k13 represent the molar fractions, m represents an integer of 1 to 200, n represents 0 or 1, R 13 to R 1 , R 21 , and R 23 each independently represent a polymerizable group, a hydrogen atom, a hydroxyl group, a cyano group, a halogen atom, a carboxyl group, an alkyl group, an alkenyl group, an alkynyl group, or an aryl group, R 16 represents a hydrogen atom or a substituent, q represents 0 or 1, R 22 represents a chain-like structural portion having a higher molecular weight than R 21 , and R 24 represents a hydrogen atom or a substituent.

15 . The solid electrolyte composition according to claim 1 , further comprising:
an active material capable of intercalating and deintercalating ions of metals belonging to Group I or II of the periodic table.

16 . The solid electrolyte composition according to claim 1 ,
wherein a content of the binder particles is 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.

17 . The solid electrolyte composition according to claim 1 ,
wherein the dispersion medium 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.

18 . An electrode sheet for a battery,
wherein a film of the solid electrolyte composition according to claim 1 is formed on a metal foil.

19 . 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 a layer constituted of the solid electrolyte composition according to claim 1 .

20 . A method for manufacturing an electrode sheet for a battery, comprising:
disposing the solid electrolyte composition according to claim 1 on a metal foil; and producing a film of the solid electrolyte composition.

21 . A method for manufacturing an all solid state secondary battery,
wherein an all solid state secondary battery is manufactured using the manufacturing method according to claim 20 .

Assignees

• Fujifilm Corp

Inventors

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

Classifications

• C08F120/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• H01M2300/0065

  Solid electrolytes · CPC title

• H01M4/622

  being polymers · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/1315 Primary

  containing halogen atoms, e.g. LiCoOxFy · CPC title