Solid electrolyte composition, solid electrolyte-containing sheet, electrode sheet for all-solid state secondary battery, all-solid state secondary battery, method of manufacturing solid electrolyte-containing sheet, method of manufacturing all-solid state secondary battery, and method of manufacturing particle binder

Patent metadata

Field	Value
Publication number	US-2021143472-A1
Application number	US-202117153888-A
Country	US
Kind code	A1
Filing date	Jan 21, 2021
Priority date	Jul 25, 2018
Publication date	May 13, 2021
Grant date	—

Abstract

Provided is an a solid electrolyte composition including: an inorganic solid electrolyte; a particle binder that includes a polymer and has an average particle size of 5 nm to 10 μm, the polymer including a component that includes a binding site represented by Formula (H-1) or (H-2) at a side chain and has a C log P value of 4 or lower and a molecular weight of lower than 1000; and a dispersion medium. A solid electrolyte-containing sheet, an electrode sheet for an all-solid state secondary battery, and an all-solid state secondary battery that include layer formed of the solid electrolyte composition are also provided. In addition, method of manufacturing the particle binder, the solid electrolyte-containing sheet, and the all-solid state secondary battery are provided.

First claim

What is claimed is:

1 . A solid electrolyte composition comprising:
an inorganic solid electrolyte having ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table; a particle binder that includes a polymer and has an average particle size of 5 nm to 10 μm, the polymer including a component that includes a binding site represented by Formula (H-1) or (H-2) at a side chain and has a C log P value of 4 or lower and a molecular weight of lower than 1000, and a component that is derived from a macromonomer having a mass average molecular weight of 1000 or higher and includes a binding site represented by Formula (H-21) or (H-22) at a side chain; and a dispersion medium,

in the formulae, X 11 , X 12 , X 13 , and X 15 each independently represent an imino group, an oxygen atom, a sulfur atom, or a selenium atom,
X 14 represents an amino group, a hydroxy group, a sulfanyl group, or a carboxy group, and
L 11 represents an alkylene group or an alkenylene group having 4 or less carbon atoms;

in the formulae, X 41 , X 42 , X 43 , and X 45 each independently represent an imino group, an oxygen atom, a sulfur atom, or a selenium atom,
X 44 represents an amino group, a hydroxy group, a sulfanyl group, or a carboxy group, and
L 41 represents an alkylene group or an alkenylene group having 4 or less carbon atoms.

2 . The solid electrolyte composition according to claim 1 ,
wherein the component having the molecular weight of lower than 1000 is represented by Formula (R-1) or (R-2),

in the formulae, X 21 , X 22 , X 23 , and X 25 each independently represent an imino group, an oxygen atom, or a sulfur atom,
X 24 represents a hydroxy group or a sulfanyl group,
R 11 to R 13 and R 15 to R 17 each independently represent a hydrogen atom, a cyano group, a halogen atom, or an alkyl group,
R 14 and R 18 each independently represent a hydrogen atom or a substituent,
L 21 to L 23 and L 25 each independently represent an alkylene group having 1 to 16 carbon atoms, an alkenylene group having 2 to 16 carbon atoms, an arylene group having 6 to 24 carbon atoms, an oxygen atom, a sulfur atom, an imino group, a carbonyl group, a phosphate linking group, a phosphonate linking group, or a linking group including a combination thereof, and
L 24 represents an alkylene group or an alkenylene group having 4 or less carbon atoms.

3 . The solid electrolyte composition according to claim 1 ,
wherein the component having the molecular weight of lower than 1000 is represented by Formula (R-21) or (R-22),

in the formulae, X 31 , X 32 , and X 35 each independently represent an imino group or an oxygen atom,
X 33 represents an oxygen atom,
X 34 represents a hydroxy group,
Y 11 and Y 12 each independently represent an imino group or an oxygen atom,
R 21 to R 23 and R 25 to R 27 each independently represent a hydrogen atom, a cyano group, or an alkyl group,
R 24 and R 28 each independently represent a hydrogen atom, a hydroxy group, an alkyl group having 1 to 6 carbon atoms, a phenyl group, or a carboxy group,
L 31 to L 33 and L 35 each independently represent an alkylene group having 1 to 16 carbon atoms, an arylene group having 6 to 12 carbon atoms, an oxygen atom, a sulfur atom, an imino group, a carbonyl group, or a linking group including a combination thereof, and
L 34 represents an alkylene group having 2 or less carbon atoms.

4 . The solid electrolyte composition according to claim 1 ,
wherein in Formula (H-1), X 11 and X 12 each independently represent an imino group and X 13 represents an oxygen atom, or in Formula (H-2), X 14 represents an amino group, a hydroxy group, a sulfanyl group, or a carboxy group, X 15 represents an imino group, and L 11 represents an alkylene group or an alkenylene group having 4 or less carbon atoms.

5 . The solid electrolyte composition according to claim 1 ,
wherein the polymer includes 20 mass % or higher and lower than 90 mass % of the component having the molecular weight of lower than 1000.

6 . The solid electrolyte composition according to claim 1 ,
wherein the C log P value is 2.5 or lower.

7 . The solid electrolyte composition according to claim 1 ,
wherein the polymer includes a component that includes a group having 6 or more carbon atoms at a side chain.

8 . The solid electrolyte composition according to claim 1 ,
wherein the particle binder includes a component that precipitates after a centrifugal separation process in a dispersion medium at a temperature of 20° C. and a rotation speed of 100000 rpm for 1 hour and a component that does not precipitate after the centrifugal separation process, and a content X of the component that precipitates and a content Y of the component that does not precipitate satisfy the following expression by mass,
Y /( X+Y )≤0.10.

9 . The solid electrolyte composition according to claim 1 ,
wherein the polymer includes at least one functional group selected from Group (a) of functional groups, Group (a) of functional groups a carboxy group, a sulfonate group, a phosphate group, a phosphonate group, an isocyanate group, an oxetane group, an epoxy group, and a silyl group.

10 . 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   Formula (1),

in the formula, L represents an element selected from Li, Na, or K, M represents an element selected from B, Zn, Sn, Si, Cu, Ga, Sb, Al, or Ge, A represents an element selected from I, Br, Cl, or F, and a1 to e1 represent compositional ratios between the respective elements, and a1:b1:c1:d1:e1 satisfies 1 to 12:0 to 5:1:2 to 12:0 to 10.

11 . The solid electrolyte composition according to claim 1 ,
wherein the dispersion medium is at least one dispersion medium selected from a ketone compound, an ester compound, an aromatic compound, or an aliphatic compound.

12 . The solid electrolyte composition according to claim 1 , comprising:
an active material capable of intercalating and deintercalating ions of a metal belonging to Group 1 or Group 2 in the periodic table.

13 . A solid electrolyte-containing sheet comprising:
a layer formed of the solid electrolyte composition according to claim 1 .

14 . An electrode sheet for an all-solid state secondary battery, the electrode sheet comprising:
an active material layer formed of the solid electrolyte composition according to claim 12 .

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 negative electrode active material layer, or the solid electrolyte layer is formed of the solid electrolyte composition according to claim 1 .

16 . A method of manufacturing a solid electrolyte-containing sheet, the method comprising:
forming a film using

Assignees

• Fujifilm Corp

Inventors

• Mimura Tomonori
• Sugasaki Atsushi

Classifications

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/622

  being polymers · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M50/216

  adapted for button or coin cells · CPC title