All-solid-state secondary battery, solid electrolyte composition and electrode sheet for batteries used in the same, and manufacturing method of electrode sheet for batteries and all-solid-state secondary battery

Patent metadata

Field	Value
Publication number	US-10297859-B2
Application number	US-201615272644-A
Country	US
Kind code	B2
Filing date	Sep 22, 2016
Priority date	Mar 28, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

An all-solid-state secondary battery includes a positive electrode active substance layer; a negative electrode active substance layer; and an inorganic solid electrolyte layer, in which at least one of the positive electrode active substance layer, the negative electrode active substance layer, or the inorganic solid electrolyte layer contains an inorganic solid electrolyte having conductivity of ions of metal belonging to Group 1 or 2 of the periodic table and a cellulose polymer.

First claim

What is claimed is:

1. An all-solid-state secondary battery, comprising:
a positive electrode active substance layer;
a negative electrode active substance layer; and
an inorganic solid electrolyte layer,
wherein at least one of the positive electrode active substance layer, the negative electrode active substance layer, or the inorganic solid electrolyte layer contains an inorganic solid electrolyte having conductivity of ions of metal belonging to Group 1 or 2 of the periodic table and a cellulose polymer,
wherein the cellulose polymer has a repeating unit represented by Formula (1) below,

L 2 , L 3 , and L 6 each independently represent a single bond or a divalent linking group, and
X 2 , X 3 , and X 6 each independently represent a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms, a hydrocarbon group having 1 to 30 carbon atoms in which a portion or all of hydrogen atoms of the hydrocarbon group are substituted with halogen atoms, or a hydrocarbon group having 1 to 30 carbon atoms in which a hydrocarbon chain of the hydrocarbon group has an ether group or a thioether group.

2. The all-solid-state secondary battery according to claim 1 ,
wherein the cellulose polymer has a repeating unit represented by Formula (1) below,

L 2 , L 3 , and L 6 each independently represent a single bond or a divalent linking group, and
X 2 , X 3 , and X 6 each independently represent a hydrogen atom, or a hydrocarbon group having 1 to 30 carbon atoms.

3. The all-solid-state secondary battery according to claim 2 ,
wherein at least one of L 2 , L 3 , or L 6 is a divalent linking group.

4. The all-solid-state secondary battery according to claim 2 ,
wherein L 2 , L 3 , and L 6 each independently represent a single bond, a carbonyl group, a carbonyloxy group, or an amide group.

5. The all-solid-state secondary battery according to claim 1 ,
wherein a total degree of substitution of a hydroxyl group of the cellulose polymer is 0.3 or greater.

6. The all-solid-state secondary battery according to claim 1 ,
wherein 0.1 parts by mass to 10 parts by mass of the cellulose polymer is contained with respect to 100 parts by mass of the inorganic solid electrolyte.

7. The all-solid-state secondary battery according to claim 1 ,
wherein the inorganic solid electrolyte layer is a layer containing the inorganic solid electrolyte and the cellulose polymer.

8. The all-solid-state secondary battery according to claim 1 ,
wherein the negative electrode active substance layer or the positive electrode active substance layer is a layer containing the inorganic solid electrolyte and the cellulose polymer.

9. The all-solid-state secondary battery according to claim 1 ,
wherein the inorganic solid electrolyte is an oxide-based inorganic solid electrolyte.

10. The all-solid-state secondary battery according to claim 9 ,
wherein the inorganic solid electrolyte is selected from a compound of a formula below:
Li xa La ya TiO 3
xa=0.3 to 0.7, ya=0.3 to 0.7,
Li 7 La 3 Zr 2 O 12 ,
Li 3.5 Zn 0.25 GeO 4 ,
LiTi 2 P 3 O 12 ,
Li 1+xh+yh (Al,Ga) xh (Ti,Ge) 2−xh Si yh P 3−yh O 12

0≤xh≤1, 0≤yh≤1,
Li 3 PO 4 ,
LiPON,
LiPOD 1

D 1 is at least one type selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Mo, Ru, Ag, Ta, W, Pt, or Au, and
LiA 1 ON

A 1 is at least one type selected from Si, B, Ge, Al, C, or Ga.

11. A solid electrolyte composition comprising:
an inorganic solid electrolyte having conductivity of ions of metal belonging to Group 1 or 2 of the periodic table and a binder constituted with a cellulose polymer having a repeating unit represented by Formula (1) below,

wherein L 2 , L 3 , and L 6 each independently represent a single bond or a divalent linking group, and
X 2 , X 3 , and X 6 independently each represent a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms, a hydrocarbon group having 1 to 30 carbon atoms in which a portion or all of hydrogen atoms of the hydrocarbon group are substituted with halogen atoms, or a hydrocarbon group having 1 to 30 carbon atoms in which a hydrocarbon chain of the hydrocarbon group has an ether group or a thioether group.

12. The solid electrolyte composition according to claim 11 ,
wherein at least one of L 2 , L 3 , or L 6 is a divalent linking group.

13. The solid electrolyte composition according to claim 11 ,
wherein at least one of X 2 , X 3 , or X 6 is a hydrocarbon group having 3 or more carbon atoms.

14. The solid electrolyte composition according to claim 11 ,
wherein L 2 , L 3 , and L 6 each independently represent a single bond, a carbonyl group, a carbonyloxy group, or an amide group.

15. The solid electrolyte composition according to claim 11 , further comprising:
a dispersion medium.

16. An electrode sheet for batteries,
wherein a film is formed with the solid electrolyte composition according to claim 11 , on a metal foil.

17. A manufacturing method of an electrode sheet for batteries, comprising:
forming a film by arranging the solid electrolyte composition according to claim 11 , on a metal foil.

18. A manufacturing method of an all-solid-state secondary battery, comprising:
manufacturing an all-solid-state secondary battery by the manufacturing method according to claim 17 .

Assignees

• Fujifilm Corp

Inventors

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

Classifications

• C08L1/10

  Esters of organic acids {, i.e. acylates} · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/056 Primary

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

• H01M10/0427

  Button cells · CPC title

• H01M10/0525

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