Secondary battery and method of manufacturing the secondary battery

Patent metadata

Field	Value
Publication number	US-11742516-B2
Application number	US-202017076019-A
Country	US
Kind code	B2
Filing date	Oct 21, 2020
Priority date	Oct 28, 2019
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A solid electrolyte-cathode assembly including a plurality of cathode layers spaced apart from each other in a first direction, and an electrolyte layer including an amorphous solid electrolyte and a crystalline solid electrolyte including a plurality of crystalline solid electrolyte particles, wherein the amorphous solid electrolyte is on a surface of a cathode layer of the plurality of cathode layers and the crystalline solid electrolyte is within the amorphous solid electrolyte.

First claim

What is claimed is:

1. A solid electrolyte-cathode assembly for a secondary battery comprising:
a plurality of cathode layers spaced apart from each other in a first direction; and
an electrolyte layer comprising
an amorphous solid electrolyte, and
a crystalline solid electrolyte comprising a plurality of crystalline solid electrolyte particles,
wherein the amorphous solid electrolyte is on a surface of a cathode layer of the plurality of cathode layers and the crystalline solid electrolyte is within the amorphous solid electrolyte,
wherein the crystalline solid electrolyte comprises first crystalline solid electrolyte particles and second crystalline solid electrolyte particles, the first and second crystalline solid electrolyte particles having different average particle sizes, and
wherein the first crystalline solid electrolyte particles and the second crystalline solid electrolyte particles comprise different materials.

2. The solid electrolyte-cathode assembly of claim 1 , wherein the crystalline solid electrolyte is present in the electrolyte layer in an amount of about 10 volume percent to about 99 volume percent, based on a total volume of the electrolyte layer.

3. The solid electrolyte-cathode assembly of claim 1 , wherein a thickness of the electrolyte layer measured in the first direction is about 100 nanometers to about 100 micrometers.

4. The solid electrolyte-cathode assembly of claim 1 , wherein an average particle size of the plurality of crystalline solid electrolyte particles is about 100 nanometers to about 100 micrometers.

5. A solid electrolyte-cathode assembly for a secondary battery comprising:
a plurality of cathode layers spaced apart from each other in a first direction; and
an electrolyte layer comprising
an amorphous solid electrolyte, and
a crystalline solid electrolyte comprising a plurality of crystalline solid electrolyte particles,
wherein the amorphous solid electrolyte is on a surface of a cathode layer of the plurality of cathode layers and the crystalline solid electrolyte is within the amorphous solid electrolyte, and

wherein a ratio of an average particle size of the plurality of crystalline solid electrolyte particles to a thickness of the electrolyte layer measured in the first direction is about 0.15:1 to about 0.25:1.

6. The solid electrolyte-cathode assembly of claim 1 , further comprising:
a cathode current collector facing an end of each of the plurality of cathode layers and contacting a portion of each of the plurality of cathode layers,
wherein the surface of the cathode layer of the plurality of cathode layers on which the amorphous solid electrolyte is present differs from the end of each of the plurality of cathode layers facing the cathode current collector.

7. The solid electrolyte-cathode assembly of claim 1 , wherein each of the plurality of cathode layers comprises
a first surface and a second surface opposite to each other, and a third surface and a fourth surface, each extending between the first surface and the second surface, wherein each of the third surface and the fourth surface has a surface area that is less than a surface area of each of the first surface and the second surface,
wherein the third surface and the fourth surface are opposite to each other, and
wherein a first surface of a first cathode layer and a second surface of a second cathode layer adjacent to the first cathode layer face each other.

8. The solid electrolyte-cathode assembly of claim 7 , wherein the electrolyte layer is on the first surface and the second surface of each of the plurality of cathode layers.

9. A solid electrolyte-cathode assembly for a secondary battery comprising:
a plurality of cathode layers spaced apart from each other in a first direction; and
an electrolyte layer comprising
an amorphous solid electrolyte, and
a crystalline solid electrolyte comprising a plurality of crystalline solid electrolyte particles,
wherein the amorphous solid electrolyte is on a surface of a cathode layer of the plurality of cathode layers and the crystalline solid electrolyte is within the amorphous solid electrolyte, and

wherein
a ratio of a thickness of a first portion of the electrolyte layer measured in the first direction to a thickness of a second portion of the electrolyte layer measured in the first direction is about 0.1:1 to about 1:1,
the solid electrolyte-cathode assembly further comprises a cathode current collector on which the plurality of cathode layers are arranged, and
the first portion of the electrolyte layer is farther from the cathode current collector than is the second portion of the electrolyte layer in a second direction perpendicular to the first direction.

10. The solid electrolyte-cathode assembly of claim 1 , wherein
a ratio of an average particle size of the first crystalline solid electrolyte particles to an average particle size of the second crystalline solid electrolyte particles is about 0.05:1 to about 0.5:1.

11. The solid electrolyte-cathode assembly of claim 1 , wherein an ion conductivity of the electrolyte layer is about 10 −6 Siemens per centimeter to about 10 −4 Siemens per centimeter.

12. The solid electrolyte-cathode assembly of claim 1 , wherein the electrolyte layer is product of heat treating at a temperature of about 50° C. to about 700° C.

13. The solid electrolyte-cathode assembly of claim 9 , wherein the crystalline solid electrolyte comprises Li 3+x La 3 M 2 O 12 , wherein M is at least one of Te, Nb, or Zr, and 0≤x≤10.

14. The solid electrolyte-cathode assembly of claim 9 , wherein the amorphous solid electrolyte comprises Li 3+x La 3 M 2 O 12 , wherein M is at least one of Te, Nb, or Zr, and 0≤x≤10.

15. A secondary battery comprising:
an anode layer on the solid electrolyte-cathode assembly of claim 7 ; and
an anode current collector contacting a portion of the anode layer and facing the cathode current collector,
wherein the anode layer is on the first surface and the second surface of each of the plurality of cathode layers.

16. A solid electrolyte-cathode assembly comprising:
a plurality of cathode layers spaced apart from each other in a first direction; and
an electrolyte layer on a surface of a cathode layer of the plurality of cathode layers;
wherein the electrolyte layer comprises:
a first amorphous solid electrolyte layer on a cathode layer of the plurality of cathode layers;
a mixed solid electrolyte layer on the first amorphous solid electrolyte layer, the mixed solid electrolyte layer comprising a plurality of third crystalline solid electrolyte particles in a second amorphous solid electrolyte; and
a third amorphous solid electrolyte layer on the mixed solid electrolyte layer.

17. The solid electrolyte-cathode assembly of claim 16 , wherein a ratio of an average particle size of the plurality of third crystalline solid electrolyte particles to a thickness of a sum of the first amorphous solid electrolyte layer and the third amorphous solid electrolyte layer measured in the first direction is about 0.5:1 to about 1:1.

18. The solid electrolyte-cathode assembly of claim 16 , wherein a plurality of fourth crystalline solid electrolyte particles are in at least one of the first amorphous solid electrolyte layer, the mixed solid electrolyte layer, or the third amorphous solid electrolyte layer.

19. The solid electrolyte-cathode assembly of claim 18 , wherein a ratio of an average particle size of the plurality of fourth crystalline solid electrolyte particles to an average parti

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lim Sungjin
• Jeong Huisu
• Heo Jin S
• Kim Kyounghwan
• Kim Mokwon
• Park Hwiyeol

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/364

  as mixtures · CPC title