Composite cathode and lithium-air battery including the same

Patent metadata

Field	Value
Publication number	US-11394052-B2
Application number	US-201916594369-A
Country	US
Kind code	B2
Filing date	Oct 7, 2019
Priority date	Oct 8, 2018
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

A composite cathode including: a cathode conductor layer including a mixed conductor; and a cathode junction layer adjacent to the cathode conductor layer, the cathode junction layer including a solid electrolyte, wherein the mixed conductor has a lithium-ion conductivity and an electrical conductivity, and wherein the solid electrolyte has a lithium-ion conductivity. In addition, the present disclosure provides a lithium-air battery including the composite cathode.

First claim

What is claimed is:

1. A composite cathode, comprising:
a cathode conductor layer comprising a mixed conductor; and
a cathode junction layer adjacent to the cathode conductor layer, the cathode junction layer comprising a solid electrolyte,
wherein the mixed conductor has a lithium-ion conductivity and an electrical conductivity,
wherein the solid electrolyte has a lithium-ion conductivity,
wherein the cathode conductor layer is carbon-free, and
wherein the mixed conductor comprises a compound represented by Formula 1:
Li x M y X z ,  Formula 1

wherein M comprises a transition metal element of Groups 3 to 12, a metalloid element of Groups 13 to 16, a metal of Groups 13 to 16 the Periodic Table, or a combination thereof,
X comprises a nonmetallic element of Groups 15 to 17 of the Periodic Table, and
x satisfies 0<x<5, y satisfies 0<y<6, and z satisfies 0<z<15, and
wherein the mixed conductor comprises Li 4 Ti 5 O 12 .

2. The composite cathode of claim 1 ,
wherein the cathode junction layer and the cathode conductor layer are in contact with each other.

3. The composite cathode of claim 1 ,
wherein the cathode junction layer has a thickness which is less than a thickness of the cathode conductor layer.

4. The composite cathode of claim 1 ,
wherein the cathode junction layer has a thickness of 0.1 micrometers to 5 micrometer.

5. The composite cathode of claim 1 ,
wherein the cathode conductor layer has a thickness of 6 micrometer to 15 micrometer.

6. The composite cathode of claim 1 ,
wherein the cathode conductor layer is a single layer.

7. The composite cathode of claim 1 ,
wherein the solid electrolyte has an ionic conductivity of about 10 −8 Siemens per centimeter or greater.

8. The composite cathode of claim 1 ,
wherein the solid electrolyte has an electrical conductivity of about 10 −8 Siemens per centimeter or less.

9. A lithium-air battery, comprising:
a composite cathode comprising a cathode conductor layer and a cathode junction layer, wherein the cathode conductor layer comprises a mixed conductor having a lithium-ion conductivity and an electrical conductivity, and
wherein the cathode junction layer is adjacent to the cathode conductor layer and includes a solid electrolyte;
an anode; and
an oxygen-blocking film adjacent to the anode,
wherein the cathode junction layer has a lithium-ion conductivity and an electrical conductivity,
wherein the cathode conductor layer is carbon-free, and
wherein the mixed conductor comprises a compound represented by Formula 1:
Li x M y X z ,  Formula 1

wherein M comprises a transition metal element of Groups 3 to 12, a metalloid element of Groups 13 to 16, a metal of Groups 13 to 16 the Periodic Table, or a combination thereof,
X comprises a nonmetallic element of Groups 15 to 17 of the Periodic Table, and
x satisfies 0<x<5, y satisfies 0<y<6, and z satisfies 0<z<15.

10. The lithium-air battery of claim 9 ,
wherein the cathode junction layer is disposed between the oxygen-blocking film and the cathode conductor layer.

11. The lithium-air battery of claim 9 ,
wherein the cathode conductor layer and the cathode junction layer are in contact with each other.

12. The lithium-air battery of claim 9 ,
wherein the oxygen-blocking film is in contact with the cathode junction layer.

13. The lithium-air battery of claim 9 ,
wherein the cathode junction layer has a thickness which is less than a thickness of the oxygen-blocking film.

14. The lithium-air battery of claim 9 ,
wherein the cathode junction layer has a thickness of 0.1 micrometer to 5 micrometer.

15. The lithium-air battery of claim 9 ,
wherein
the solid electrolyte comprises a polymer electrolyte, an inorganic electrolyte, an organic-inorganic composite electrolyte, or a combination thereof.

16. The lithium-air battery of claim 15 ,
wherein the polymer electrolyte comprises an ionically conductive polymer.

17. The lithium-air battery of claim 15 ,
wherein the inorganic electrolyte comprises a glassy electrolyte, a ceramic electrolyte, a glass-ceramic electrolyte, or a combination thereof.

18. The lithium-air battery of claim 15 ,
wherein the organic-inorganic composite electrolyte comprises an ionically conductive polymer and an inorganic electrolyte.

19. The lithium-air battery of claim 9 ,
wherein the anode comprises lithium or an alloy comprising lithium.

20. The lithium-air battery of claim 1 ,
wherein M comprises Ti, Co, Fe, or a combination thereof, and
X comprises O.

21. The composite cathode of claim 1 ,
wherein the mixed conductor comprises LiCoO 2 .

22. The composite cathode of claim 1 ,
wherein the mixed conductor comprises LiFePO 4 .

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Dongjoon
• Kim Mokwon
• Ma Sangbok
• Park Jungock
• Lee Heungchan

Classifications

• H01M50/417

  Polyolefins · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/8615

  Bifunctional electrodes for rechargeable cells · CPC title

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title