Anode and battery using the same

• US 20040166409A1
• Filed: 12/23/2003
• Published: 08/26/2004
• Est. Priority Date: 12/26/2002
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kawase, Kenichi, Miyaki, Yukio, Takada, Tomoo
• Granted Patent: US 7,226,700 B2
• Time in Patent Office: Days
• US Class Current: 429/218.1
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 4/0421 involving vapour deposition
• CPC Class Codes: H01M 4/0426 Sputtering
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/387 Tin or alloys based on tin
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/70 characterised by shape or form
• CPC Class Codes: H01M 50/109 of button or coin shape
• CPC Class Codes: H01M 6/10 with wound or folded electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Provided is a battery capable of improving cycle characteristics without increasing the thickness of an anode current collector. An anode active material layer including at least one kind selected from the group consisting of Sn and compounds thereof is formed on an anode current collector having a projection on a substrate through a vapor deposition method, a liquid-phase deposition method or a sintering method, and the anode current collector and the anode active material layer are alloyed with each other in at least a portion of an interface therebetween. By a function of the projection, the anode current collector can be prevented from being cracked into small pieces due to expansion and shrinkage of the anode active material layer. Further, a stress on the anode active material layer due to the expansion and the shrinkage can be spread out so that cracks produced in the anode active material layer can be scattered in various directions to reduce the size of the cracks.

Claims

1. An anode, comprising:

an anode current collector having a projection on a substrate; and

an anode active material layer including at least one kind selected from the group consisting of tin (Sn) and compounds thereof, and being formed on the anode current collector, and being alloyed with the anode current collector in at least a portion of an interface with the anode current collector.

2. An anode according to claim 1, wherein

the anode active material is formed through at least one kind selected from the group consisting of a vapor deposition method, a liquid-phase deposition method and a sintering method.

3. An anode according to claim 1, wherein

the projection includes at least one kind selected from the group consisting of copper (Cu), iron (Fe), nickel (Ni), cobalt (Co), manganese (Mn), titanium (Ti), molybdenum (Mo) and compounds thereof.

4. An anode according to claim 1, wherein

the projection includes at least one kind selected from the group consisting of copper (Cu), iron (Fe), nickel (Ni), cobalt (Co), manganese (Mn), titanium (Ti), molybdenum (Mo) and compounds thereof, and at least one kind selected from the group consisting of aluminum (Al), zinc (Zn), silver (Ag), gold (Au), germanium (Ge), indium (In) and compounds thereof.

5. An anode according to claim 1, wherein

the projection includes a first projection having at least one kind selected from the group consisting of copper (Cu), iron (Fe), nickel (Ni), cobalt (Co), manganese (Mn), titanium (Ti), molybdenum (Mo) and compounds thereof, and a second projection having at least one kind selected from the group consisting of aluminum (Al), zinc (Zn), silver (Ag), gold (Au), germanium (Ge), indium (In) and compounds thereof.

6. An anode according to claim 1 wherein

the average diameter of the projection is within a range of 0.5 μ

m to 20 μ

m.

7. An anode according to claim 1, wherein

the substrate includes at least one kind selected from the group consisting of copper (Cu), nickel (Ni), cobalt (Co), manganese (Mn), titanium (Ti), molybdenum (Mo), aluminum (Al) and stainless.

8. An anode according to claim 1, wherein

the surface roughness of the substrate is within a range of 0.1 μ

m to 20 μ

m as arithmetic mean roughness.

9. A battery, comprising:

a cathode;

an anode; and

an electrolyte,

wherein the anode comprises;

an anode current collector having a projection on a substrate; and

an anode active material layer including at least one kind selected from the group consisting of tin (Sn) and compounds thereof, and being formed on the anode current collector, and being alloyed with the anode current collector in at least a portion of an interface with the anode current collector.

10. A battery according to claim 9, wherein

the anode active material is formed through at least one kind selected from the group consisting of a vapor deposition method, a liquid-phase deposition method and a sintering method.

11. A battery according to claim 9, wherein

the projection includes at least one kind selected from the group consisting of copper (Cu), iron (Fe), nickel (Ni), cobalt (Co), manganese (Mn), titanium (Ti), molybdenum (Mo) and compounds thereof.

12. A battery according to claim 9, wherein

the projection includes at least one kind selected from the group consisting of copper (Cu), iron (Fe), nickel (Ni) cobalt (Co), manganese (Mn), titanium (Ti), molybdenum (Mo) and compounds thereof, and at least one kind selected from the group consisting of aluminum (Al), zinc (Zn), silver (Ag), gold (Au), germanium (Ge), indium (In) and compounds thereof.

13. A battery according to claim 9, wherein

the projection includes a first projection having at least one kind selected from the group consisting of copper (Cu), iron (Fe), nickel (Ni), cobalt (Co), manganese (Mn), titanium (Ti), molybdenum (Mo) and compounds thereof, and a second projection having at least one kind selected from the group consisting of aluminum (Al), zinc (Zn), silver (Ag), gold (Au), germanium (Ge), indium (In) and compounds thereof.

14. A battery according to claim 9, wherein

the average diameter of the projection is within a range of 0.5 μ

m to 20 μ

m.

15. A battery according to claim 9, wherein

the substrate includes at least one kind selected from the group consisting of copper (Cu), nickel (Ni), cobalt (Co), manganese (Mn), titanium (Ti), molybdenum (Mo), aluminum (Al) and stainless.

16. A battery according to claim 9, wherein

the surface roughness of the substrate is within a range of 0.1 μ

m to 20 μ

m as arithmetic mean roughness.

17. A battery according to claim 9, wherein

the electrolyte includes a retaining body, a solvent and an electrolyte salt.

18. A battery according to claim 9, further comprising:

a film-shaped package part for containing the cathode, the anode and the electrolyte therein.