Solid electrolyte composition, electrode sheet for all-solid state secondary battery, all-solid state secondary battery, and methods for manufacturing electrode sheet for all-solid state secondary battery and all-solid state secondary battery

Patent metadata

Field	Value
Publication number	US-10818967-B2
Application number	US-201816019963-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Feb 19, 2016
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

Provided are a solid electrolyte composition including an active material, a first sulfide-based inorganic solid electrolyte, and a second sulfide-based inorganic solid electrolyte having a composition different from that of the first sulfide-based inorganic solid electrolyte, in which the first sulfide-based inorganic solid electrolyte contains a halogen element and has a crystal phase at least in part, and the active material and the first sulfide-based inorganic solid electrolyte are in contact with each other, an electrode sheet for an all-solid state secondary battery and an all-solid state secondary battery for which the solid electrolyte composition is used, and methods for manufacturing an electrode sheet for an all-solid state secondary battery and an all-solid state secondary battery.

First claim

What is claimed is:

1. A solid electrolyte composition comprising:
an active material;
a first sulfide-based inorganic solid electrolyte; and
a second sulfide-based inorganic solid electrolyte having a composition different from that of the first sulfide-based inorganic solid electrolyte,
wherein the active material is a positive electrode active material or a negative electrode active material,
wherein the positive electrode active material contains a transition metal oxide,
wherein the negative electrode active material contains at least one of a carbonaceous material, a metal oxide, a metal complex oxide, lithium, a lithium alloy, a metal capable of forming an alloy with lithium,
wherein the first sulfide-based inorganic solid electrolyte is a sulfide-based inorganic solid electrolyte represented by Formula (1),
L a MY b X c   Formula(1)

in Formula (1), L represents at least one element selected from the group consisting of Li, Na, and K, M represents at least one element selected from the group consisting of Al, Ga, In, Si, Ge, Sn, P, As, Ti, Zr, V, Nb, and Ta, Y represents at least one element selected from the group consisting of O, S, and Se; here, the sulfide-based inorganic solid electrolyte represented by Formula (1) includes at least S represented by Y, X represents at least one element selected from the group consisting of Cl, Br, and I, 2≤a<12, 2≤b≤8, and 0<c≤5,
wherein the first sulfide-based inorganic solid electrolyte has a crystal phase at least in part, and
wherein the first sulfide-based inorganic solid electrolyte coats the active material.

2. The solid electrolyte composition according to claim 1 ,
wherein the first sulfide-based inorganic solid electrolyte is represented by Formula (2),
Li 7-x PS 6-x X x   Formula(2)

in Formula (2), X is at least one element selected from the group consisting of Cl, Br, and I, and 0<x≤2.

3. The solid electrolyte composition according to claim 1 ,
wherein X includes at least one element selected from the group consisting of Cl and Br.

4. The solid electrolyte composition according to claim 1 , further comprising:
a binder.

5. The solid electrolyte composition according to claim 4 ,
wherein the binder has a particle shape.

6. The solid electrolyte composition according to claim 4 ,
wherein the binder is an acrylic latex, a urethane latex, and/or a urea latex.

7. An electrode sheet for an all-solid state secondary battery comprising:
a layer of the solid electrolyte composition according to claim 1 on a collector.

8. An all-solid state secondary battery comprising:
a positive electrode active material layer;
a negative electrode active material layer; and
an inorganic solid electrolyte layer,
wherein at least one layer of the positive electrode active material layer and the negative electrode active material layer is a layer of the solid electrolyte composition according to claim 1 .

9. A method for manufacturing an electrode sheet for an all-solid state secondary battery, comprising the following steps of:
[1] a step of coating an active material with a first sulfide-based inorganic solid electrolyte; and
[2] a step of mixing a second sulfide-based inorganic solid electrolyte and the active material coated with the first sulfide-based inorganic solid electrolyte,
wherein the active material is a positive electrode active material or a negative electrode active material,
wherein the positive electrode active material contains a transition metal oxide,
wherein the negative electrode active material contains at least one of a carbonaceous material, a metal oxide, a metal complex oxide, lithium, a lithium alloy, a metal capable of forming an alloy with lithium,
wherein the first sulfide-based inorganic solid electrolyte is a first sulfide-based inorganic solid electrolyte represented by Formula (1),
L a MY b X c   Formula(1)

in Formula (1), L represents at least one element selected from the group consisting of Li, Na, and K, M represents at least one element selected from the group consisting of Al, Ga, In, Si, Ge, Sn, P, As, Ti, Zr, V, Nb, and Ta, Y represents at least one element selected from the group consisting of O, S, and Se; here, the sulfide-based inorganic solid electrolyte represented by Formula (1) includes at least S represented by Y, X represents at least one element selected from the group consisting of Cl, Br, and I, 2≤a<12, 2≤b≤8, and 0<c≤5,
wherein the first sulfide-based inorganic solid electrolyte has a crystal phase at least in part, and
the second sulfide-based inorganic solid electrolyte has a composition different from that of the first sulfide-based inorganic solid electrolyte.

10. A method for manufacturing an all-solid state secondary battery, comprising:
manufacturing an all-solid state secondary battery using the method for manufacturing an electrode sheet for an all-solid state secondary battery according to claim 9 .

11. The solid electrolyte composition according to claim 1 , wherein the second sulfide-based inorganic solid electrolyte is a glass containing Li, P, and S or a glass ceramic containing Li, P and S.

12. The method for manufacturing an electrode sheet for an all-solid state secondary battery according to claim 9 , wherein the second sulfide-based inorganic solid electrolyte is a glass containing Li, P, and S or a glass ceramic containing Li, P and S.

Assignees

• Fujifilm Corp

Inventors

• Kaga Hiroshi
• Mochizuki Hiroaki
• Mimura Tomonori

Classifications

• Y02P70/50

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

• C01D15/00

  Lithium compounds · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/583

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