Electrode sheet for all-solid state secondary battery, all-solid state secondary battery, and method of manufacturing electrode sheet for all-solid state secondary battery and all-solid state secondary battery

Patent metadata

Field	Value
Publication number	US-2020313161-A1
Application number	US-202016902275-A
Country	US
Kind code	A1
Filing date	Jun 16, 2020
Priority date	Feb 5, 2018
Publication date	Oct 1, 2020
Grant date	—

Abstract

Provided are an electrode sheet for an all-solid state secondary battery, including, in the following order: a conductor layer containing conductive particles (C); and an electrode active material layer on at least one surface of an electrode collector,
in which the electrode active material layer containing an active material (A) having a median diameter R am and an inorganic solid electrolyte (B) having a median diameter R se is provided on a surface of the conductor layer having a maximum height roughness Rz of 3.0 to 10 μm, which is defined in JIS B 0601:2013, and
R am , R se , and Rz satisfy the following Expressions (1) and (2), an all-solid state secondary battery provided with the electrode sheet for an all-solid state secondary battery, and a method thereof.
0.15< Rz/R am <90  Expression (1):

0.15< Rz/R se <90  Expression (2):

First claim

What is claimed is:

1 . An electrode sheet for an all-solid state secondary battery, comprising, in the following order:
a conductor layer containing conductive particles (C); and an electrode active material layer on at least one surface of an electrode collector, wherein the electrode active material layer containing an active material (A) having a median diameter R am and an inorganic solid electrolyte (B) having a median diameter R se is provided on a surface of the conductor layer having a maximum height roughness Rz of 3.0 to 10 μm, which is defined in JIS B 0601:2013, and R am , R se , and Rz satisfy the following Expressions (1), (2) and (3a).
0.15< Rz/R am <90  Expression (1):

0.15< Rz/R se <90  Expression (2):

1< R am /R se <100  Expression (3a):

2 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein the conductive particles (C) include carbon particles (C1).

3 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein R se is 0.2 μm or more and 7 μm or less.

4 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein R am is 0.5 μm or more and 10 μm or less.

5 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein the conductor layer contains a binder (D).

6 . The electrode sheet for an all-solid state secondary battery according to claim 5 , wherein the binder (D) is at least one of rubber, a thermoplastic elastomer, a hydrocarbon resin, a silicone resin, an acrylic resin, or fluoro rubber.

7 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein the Expression (1) represents 0.4<Rz/R am <90.

8 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein the Expression (2) represents 0.6<Rz/R se <90.

9 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein the Expression (3a) represents 1<R am /R sc <20.

10 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein the inorganic solid electrolyte (B) is a sulfide-based inorganic solid electrolyte.

11 . The electrode sheet for an all-solid state secondary battery according to claim 1 , wherein the conductive particles (C) comprise conductive inorganic particles or carbon particles (C1).

12 . The electrode sheet for an all-solid state secondary battery according to claim 11 , wherein the conductive inorganic particles are at least one of aluminum particles, silver particles, copper particles, indium oxide particles, tin particles, tin oxide particles, or titanium oxide particles.

13 . An all-solid state secondary battery comprising the electrode sheet for an all-solid state secondary battery according to claim 1 .

14 . A method of manufacturing an electrode sheet for an all-solid state secondary battery, which includes, in the following order: a conductor layer containing conductive particles (C);
and an electrode active material layer on at least one surface of an electrode collector, and in which the electrode active material layer containing an active material (A) having a median diameter R am and an inorganic solid electrolyte (B) having a median diameter R se is provided on a surface of the conductor layer having a maximum height roughness Rz of 3.0 to 10 μm, which is defined in JIS B 0601:2013, the method comprising: a step of adjusting Rz with the conductive particles (C), wherein R am , R se , and Rz satisfy the following Expressions (1), (2) and (3a).
0.15< Rz/R am <90  Expression (1):

0.15< Rz/R se <90  Expression (2):

1< R am /R se <100  Expression (3a):

15 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein the conductive particles (C) include carbon particles (C1).

16 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein R se is 0.2 μm or more and 7 μm or less.

17 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein R am is 0.5 μm or more and 10 μm or less.

18 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein the conductor layer contains a binder (D).

19 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 18 , wherein the binder (D) is at least one of rubber, a thermoplastic elastomer, a hydrocarbon resin, a silicone resin, an acrylic resin, or fluoro rubber.

20 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein the Expression (1) represents 0.4<Rz/R am <90.

21 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein the Expression (2) represents 0.6<Rz/R se <90.

22 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein the Expression (3a) represents 1<R am /R se <20.

23 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein the inorganic solid electrolyte (B) is a sulfide-based inorganic solid electrolyte.

24 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 , wherein the conductive particles (C) comprise conductive inorganic particles or carbon particles (C1).

25 . The method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 24 , wherein the conductive inorganic particles are at least one of aluminum particles, silver particles, copper particles, indium oxide particles, tin particles, tin oxide particles, or titanium oxide particles.

26 . A method of manufacturing an all-solid state secondary battery, comprising: a step of incorporating the electrode sheet for an all-solid state secondary battery, which is obtained by the method of manufacturing an electrode sheet for an all-solid state secondary battery according to claim 14 .

Assignees

• Fujifilm Corp

Inventors

• Isojima Hiroshi
• Ozawa Shin

Classifications

• Y02P70/50

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

• H01M10/0562

  Solid materials · CPC title

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title