Positive electrode for lithium-ion secondary battery, and lithium-ion secondary battery

Patent metadata

Field	Value
Publication number	US-9853323-B2
Application number	US-201414529486-A
Country	US
Kind code	B2
Filing date	Oct 31, 2014
Priority date	Oct 31, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A positive electrode for a lithium-ion secondary battery includes a positive electrode particle including a positive active material including a lithium salt, and a coating layer including an amorphous carbonaceous layer on a surface of the positive active material, and a sulfide solid electrolyte contacting the coating layer, wherein the sulfide solid electrolyte includes a solid sulfide.

First claim

What is claimed is:

1. A positive electrode for a lithium-ion secondary battery, the positive electrode comprising:
a positive electrode particle comprising
a positive active material comprising a lithium salt, and
a coating layer comprising an amorphous carbonaceous layer on a surface of the positive active material; and

a sulfide solid electrolyte contacting the coating layer, wherein the sulfide solid electrolyte comprises a solid sulfide,
wherein the coating layer comprises a diamond-like carbon,
wherein the coating layer comprises hydrogen atoms, and
wherein an amount of the hydrogen atoms is in the range of about 1 atomic percent to about 50 atomic percent, based on a total content of the coating layer.

2. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein the coating layer comprises an aliphatic hydrocarbon, an aromatic hydrocarbon, or a combination thereof.

3. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein the coating layer comprises a deposition product of acetylene, methane, benzene, toluene, xylene, naphthalene, cyclohexane, or a combination thereof.

4. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein the coating layer comprises a deposition product of an alicyclic hydrocarbon of the formula C 4n+6 H 4n+12 , where n is a positive integer.

5. The positive electrode for a lithium-ion secondary battery of claim 1 ,
wherein the coating layer comprises sp 2 hybridized carbon atoms and sp 3 hybridized carbon atoms, and
wherein a content of the sp 3 hybridized carbon atoms in the coating layer is in the range of about 10% to about 100%, based on a total carbon content of the coating layer.

6. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein the coating layer is formed by plasma-enhanced chemical vapor deposition or physical vapor deposition.

7. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein the sulfide solid electrolyte is in a form of particles.

8. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein the sulfide solid electrolyte comprises sulfur and lithium, and further comprises phosphorus (P), silicon (Si), boron (B), aluminum (Al), germanium (Ge), zinc (Zn), gallium (Ga), indium (In), a halogen element, or a combination thereof.

9. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein the sulfide solid electrolyte comprises
lithium sulfide; and
silicon sulfide, phosphorus sulfide, boron sulfide, or a combination thereof.

10. A lithium-ion secondary battery comprising:
a positive electrode layer comprising a positive electrode particle comprising
a positive active material comprising a lithium salt, and
a coating layer comprising an amorphous carbonaceous layer on a surface of the positive active material;

a negative electrode layer comprising a negative active material; and
a sulfide solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer, wherein the sulfide solid electrolyte layer comprises a sulfide solid electrolyte comprising a solid sulfide,
wherein the coating layer comprises a diamond-like carbon,
wherein the coating layer comprises hydrogen atoms, and
wherein an amount of the hydrogen atoms is in the range of about 1 atomic percent to about 50 atomic percent, based on a total content of the coating layer.

11. The lithium-ion secondary battery of claim 10 , wherein the coating layer comprises a deposition product of an aliphatic hydrocarbon, an aromatic hydrocarbon, or a combination thereof.

12. The lithium-ion secondary battery of claim 10 , wherein the coating layer comprises a deposition product of acetylene, methane, benzene, toluene, xylene, naphthalene, cyclohexane, or a combination thereof.

13. The lithium-ion secondary battery of claim 10 , wherein the coating layer comprises a deposition product of an alicyclic hydrocarbon of the formula C 4n+6 H 4n+12 , where n is a positive integer.

14. The lithium-ion secondary battery of claim 10 , wherein the coating layer consists of the diamond-like carbon.

15. The lithium-ion secondary battery of claim 10 , wherein the coating layer comprises sp 2 hybridized carbon atoms and sp 3 hybridized carbon atoms, and a content of the sp 3 hybridized carbon atoms in the coating layer is in the range of about 10% to about 100%, based on a total carbon content of the coating layer.

16. The lithium-ion secondary battery of claim 10 , wherein the positive active material comprises a lithium salt of a transition metal oxide having a layered rock-salt type structure.

17. The lithium-ion secondary battery of claim 16 , wherein the lithium salt of the transition metal oxide having a layered rock-salt type structure is LiNi x Co y Al z O 2 or LiNi x Co y Mn z O 2 , where 0<x<1, 0<y<1, 0<z<1, and x+y+z=1.

18. The lithium-ion secondary battery of claim 10 , wherein the sulfide solid electrolyte comprises sulfur and lithium, and further comprises phosphorus (P), silicon (Si), boron (B), aluminum (Al), germanium (Ge), zinc (Zn), gallium (Ga), indium (In), a halogen element, or a combination thereof.

19. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein a content of sp 3 hybridized carbon atoms in the coating layer is in a range of about 30% to about 70%, based on a total carbon content of the coating layer.

20. The positive electrode for a lithium-ion secondary battery of claim 19 , wherein a ratio of the sp 2 hybridized carbon atoms to sp 3 hybridized carbon atoms in the coating layer is in a range of about 40:60 to about 60:40, based on a total carbon content of the coating layer.

21. The positive electrode for a lithium-ion secondary battery of claim 1 , wherein the coating layer consists of the diamond-like carbon.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Visbal Heidy
• Aihara Yuichi

Classifications

• H01M4/366

  as layered products · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/131

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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/052

  Li-accumulators · CPC title