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

• US 9,853,323 B2
• Filed: 10/31/2014
• Issued: 12/26/2017
• Est. Priority Date: 10/31/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Visbal, Heidy, Aihara, Yuichi
• Primary Examiner(s): AMPONSAH, OSEI K
• Application Number:
  US14/529,486
• Publication Number:
  US 20150118574A1
• Time in Patent Office: 1,152 Days
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

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.

Claims

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+6H_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 sp² hybridized carbon atoms and sp³ hybridized carbon atoms, and

wherein a content of the sp³ 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.

19. The positive electrode for a lithium-ion secondary battery of claim 1, wherein a content of sp³ 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 sp² hybridized carbon atoms to sp³ 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.

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+6H_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 sp² hybridized carbon atoms and sp³ hybridized carbon atoms, and a content of the sp³ 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_xCo_yAl_zO₂ or LiNi_xCo_yMn_zO₂, 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.