NEGATIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY, LITHIUM SECONDARY BATTERY USING SAME, AND METHODS FOR MANUFACTURING THOSE

• US 20090017380A1
• Filed: 01/23/2006
• Published: 01/15/2009
• Est. Priority Date: 01/26/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Honda, Kazuyoshi, Kogetsu, Yasutaka, Ogawa, Yuuko
• Granted Patent: US 8,076,027 B2
• Time in Patent Office: Days
• US Class Current: 429/218.100
• 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 4/1315 containing halogen atoms, e.g. LiCoOxFy
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/387 Tin or alloys based on tin
• CPC Class Codes: H01M 4/66 Selection of materials
• CPC Class Codes: H01M 50/409 Separators, membranes or diaphragms characterised by the material
• CPC Class Codes: H01M 50/489 Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• CPC Class Codes: H01M 50/491 Porosity
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49115 including coating or impregnating

Abstract

A negative electrode for a secondary battery includes a separator; a negative electrode active material layer which is fixed to the separator and can store and emit lithium ions; and a current collector layer formed on the side of the separator opposite to the negative electrode active material layer. The negative electrode active material layer contains at least one selected from the group consisting of silicon, silicon alloys, compounds containing silicon and oxygen, compounds containing silicon and nitrogen, compounds containing silicon and fluorine, tin, tin alloys, compounds containing tin and oxygen, compounds containing tin and nitrogen, and compounds containing tin and fluorine.

Claims

1. A negative electrode for a lithium secondary battery comprising:

a separator;

a negative electrode active material layer fixed to the separator, the negative electrode active material layer being capable of storing and emitting lithium ions and containing at least one selected from a group consisting of silicon, silicon alloys, compounds containing silicon and oxygen, compounds containing silicon and nitrogen, compounds containing silicon and fluorine, tin, tin alloys, compounds containing tin and oxygen, compounds containing tin and nitrogen, and compounds containing tin and fluorine; and

a current collector layer formed on a side of the negative electrode active material layer, the side opposite to the separator, wherein

the negative electrode active material layer is provided with a groove opened to a side opposite to the separator.

3. The negative electrode for a lithium secondary battery according to claim 1, wherein

the current collector layer includes a metallic current collector layer containing at least one of copper and nickel.

4. The negative electrode for a lithium secondary battery according to claim 3, wherein

the current collector layer includes a carbon current collector layer containing carbon.

5. The negative electrode for a lithium secondary battery according to claim 4, wherein

the metallic current collector layer is formed on the negative electrode active material layer;

and

the carbon current collector layer is formed on the metallic current collector layer.

6. The negative electrode for a lithium secondary battery according to claim 4, wherein

the carbon current collector layer is formed on the negative electrode active material layer;

and

the metallic current collector layer is formed on the carbon current collector layer.

7. The negative electrode for a lithium secondary battery according to claim 1, wherein the separator is a microporous film provided with micropores.

8. The negative electrode for a lithium secondary battery according to claim 1, wherein the separator has a heat resistance layer resistant to temperatures of at lowest 200°

C. on a side thereof, the side having the negative electrode active material fixed thereto.

9. A lithium secondary battery comprising:

the negative electrode for a lithium secondary battery according to claim 1;

a positive electrode capable of reversibly storing and emitting lithium ions; and

an electrolyte contained at least in the separator, the electrolyte capable of conducting lithium ions.

2. (canceled)

10. A method for manufacturing a negative electrode for a lithium secondary battery comprising:

A) forming a negative electrode active material layer on a separator by a gas-phase process so as to have island structure, the negative electrode active material layer being capable of storing and emitting lithium ions and containing at least one selected from a group consisting of silicon, silicon alloys, compounds containing silicon and oxygen, compounds containing silicon and nitrogen, compounds containing silicon and fluorine, tin, tin alloys, compounds containing tin and oxygen, compounds containing tin and nitrogen, and compounds containing tin and fluorine; and

B) forming a current collector layer on the negative electrode active material layer by a gas-phase process.

11. The method for manufacturing a negative electrode for a lithium secondary battery according to claim 10, wherein

at least one of a metallic current collector layer containing at least one of copper and nickel, and a carbon current collector layer containing carbon is formed in Step B.

12. The method for manufacturing a negative electrode for a lithium secondary battery according to claim 10, further comprising:

expanding the separator after Step A.

16. The method for manufacturing a negative electrode for a lithium secondary battery according to claim 11, further comprising:

expanding the separator after Step A.

13. A method for manufacturing a lithium secondary battery comprising:

A) forming a negative electrode active material layer on a separator by a gas-phase process so as to have island structure, the negative electrode active material layer being capable of storing and emitting lithium ions and containing at least one selected from a group consisting of silicon, silicon alloys, compounds containing silicon and oxygen, compounds containing silicon and nitrogen, compounds containing silicon and fluorine, tin, tin alloys, compounds containing tin and oxygen, compounds containing tin and nitrogen, and compounds containing tin and fluorine;

B) forming a current collector layer on the negative electrode active material layer by a gas-phase process;

C) providing a positive electrode on a side of the separator opposite to the negative electrode active material layer, the positive electrode being capable of storing and emitting lithium ions; and

D) impregnating at least the separator with an electrolyte having a lithium-ion conductivity.

14. The method for manufacturing a lithium secondary battery according to claim 13, wherein

at least one of a metallic current collector layer containing at least one of copper and nickel, and a carbon current collector layer containing carbon is formed in Step B.

15. The method for manufacturing a lithium secondary battery according to claim 13, further comprising:

expanding the separator after Step A.

17. The method for manufacturing a lithium secondary battery according to claim 14, further comprising:

expanding the separator after Step A.