Solid electrolyte composition containing nonspherical polymer particles, dispersion medium and inorganic solid electrolyte

Patent metadata

Field	Value
Publication number	US-10535896-B2
Application number	US-201615237845-A
Country	US
Kind code	B2
Filing date	Aug 16, 2016
Priority date	Feb 17, 2014
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

Provided is a solid electrolyte composition including nonspherical polymer particles; a dispersion medium; and an inorganic solid electrolyte, in which the nonspherical polymer particles is formed of a polymer having at least one of a specific functional group, an acidic group having an acid dissociation constant pKa of 14 or less, or a basic group having a conjugate acid pKa of 14 or less.

First claim

What is claimed is:

1. A solid electrolyte composition comprising:
nonspherical polymer particles;
a dispersion medium; and
an inorganic solid electrolyte,
wherein the nonspherical polymer particles are formed of a polymer having at least one of a functional group selected from a group of functional groups a, an acidic group having an acid dissociation constant pKa of 14 or less, or a basic group having a conjugate acid pKa of 14 or less, and wherein an average particle diameter of the nonspherical polymer particles is 0.1 μm or greater and 5 μm or less,
wherein the group of functional groups a is a substituent or a linking group,
wherein the substituent is a carboxyl group, a sulfonic acid group, a phosphoric acid group, a hydroxy group, CONR N 2 , a cyano group, NR N 2 , or a thiol group,
wherein the linking group is a carbonyloxy group, a carbonyl group, NR N , S, O, CONR N , OCOO, NR N COO, or a urea group,
wherein R N represents a hydrogen atom, an alkyl group, or an aryl group,
wherein flatness of the nonspherical polymer particles is 1.2 or greater, and
wherein the polymer for forming the nonspherical polymer particles includes at least a repeating unit of Formula (1) below,

wherein L 1 represents an alkylene group having 1 to 20 carbon atoms or an arylene group having 6 to 22 carbon atoms, and R N represents a hydrogen atom, an alkyl group, or an aryl group.

2. The solid electrolyte composition according to claim 1 ,
wherein a glass transition temperature of the nonspherical polymer particles is −50° C. to 50° C.

3. A solid electrolyte composition comprising:
nonspherical polymer particles;
a dispersion medium; and
an inorganic solid electrolyte,
wherein the nonspherical polymer particles are formed of a polymer having at least one of a functional group selected from a group of functional groups a, an acidic group having an acid dissociation constant pKa of 14 or less, or a basic group having a conjugate acid pKa of 14 or less,
wherein the group of functional groups a is a substituent or a linking group,
wherein the substituent is a carboxyl group, a sulfonic acid group, a phosphoric acid group, a hydroxy group, CONR N 2 , a cyano group, NR N 2 , or a thiol group,
wherein the linking group is a carbonyloxy group, a carbonyl group, NR N , S, O, CONR N , OCOO, NR N COO, or a urea group,
wherein R N represents a hydrogen atom, an alkyl group, or an aryl group,
wherein flatness of the nonspherical polymer particles is 1.2 or greater,
wherein a polymer for forming the nonspherical polymer particles has a polyalkylene oxide chain, a polycarbonate chain, a polyester chain, or a polysiloxane chain of which a weight average molecular weight is 200 or greater, and
wherein the polymer for forming the nonspherical polymer particles includes at least a repeating unit of Formula (1) below,

wherein L 1 represents an alkylene group having 1 to 20 carbon atoms or an arylene group having 6 to 22 carbon atoms, and R N represents a hydrogen atom, an alkyl group, or an aryl group.

4. The solid electrolyte composition according to claim 1 ,
wherein the polymer for forming the nonspherical polymer particles has a crosslinkable group.

5. The solid electrolyte composition according to claim 1 ,
wherein a boiling point of the dispersion medium at a normal pressure is 80° C. to 220° C.

6. The solid electrolyte composition according to claim 1 ,
wherein solubility of the dispersion medium in water is 5 mass % or less at 20° C.

7. The solid electrolyte composition according to claim 1 ,
wherein a content of the nonspherical polymer particles is 0.1 parts by mass to 10 parts by mass with respect to 100 parts by mass of the inorganic solid electrolyte.

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

9. The solid electrolyte composition according to claim 1 ,
wherein the inorganic solid electrolyte is a sulfide-based inorganic solid electrolyte.

10. A method for manufacturing the solid electrolyte composition of claim 1 , comprising:
a first step of mixing and mechanically dispersing nonspherical polymer particles and a dispersion medium below to form slurry liquid of nonspherical polymer particles; and
a second step of further mechanically dispersing a slurry liquid of polymer particles obtained as above in presence of an inorganic solid electrolyte,
wherein the nonspherical polymer particles are formed of a polymer having at least one of a functional group selected from a group of functional groups a, an acidic group having an acid dissociation constant pKa of 14 or less, or a basic group having a conjugate acid pKa of 14 or less, and wherein an average particle diameter of the nonspherical polymer particles is 0.1 μm or greater and 5 μm or less,
wherein the group of functional groups a is a substituent or a linking group,
wherein the substituent is a carboxyl group, a sulfonic acid group, a phosphoric acid group, a hydroxy group, CONR N 2 , a cyano group, NR N 2 , or a thiol group,
wherein the linking group is a carbonyloxy group, a carbonyl group, NR N , S, O, CONR N , OCOO, NR N COO, or a urea group,
wherein R N represents a hydrogen atom, an alkyl group, or an aryl group,
wherein flatness of the nonspherical polymer particles is 1.2 or greater, and
wherein the polymer for forming the nonspherical polymer particles includes at least a repeating unit of Formula (1) below,

wherein L 1 represents an alkylene group having 1 to 20 carbon atoms or an arylene group having 6 to 22 carbon atoms, and R N represents a hydrogen atom, an alkyl group, or an aryl group.

11. The method for manufacturing the solid electrolyte composition according to claim 10 ,
wherein the mechanical dispersion in the first step and/or the second step is performed by a ball mill dispersion method.

12. An electrode sheet for a battery comprising:
the solid electrolyte composition according to claim 1 .

13. A method for manufacturing an electrode sheet for a battery, comprising:
a third step of applying the solid electrolyte composition according to claim 1 to a collector and heating the solid electrolyte composition to a temperature of the glass transition temperature or greater of the nonspherical polymer particles.

14. An all-solid-state secondary battery comprising:
the electrode sheet for a battery according to claim 12 .

Assignees

• Fujifilm Corp

Inventors

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

Classifications

• C08G18/6692

  with compounds of group C08G18/34 · CPC title

• C08G18/348

  Hydroxycarboxylic acids · CPC title

• C08G18/3206

  aliphatic · CPC title

• C08G18/4854

  Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group · CPC title

• H01M10/0525

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