Negative electrode for lithium secondary battery, method for manufacturing the same and lithium secondary battery

• US 20050142447A1
• Filed: 12/23/2004
• Published: 06/30/2005
• Est. Priority Date: 12/26/2003
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Shoji, Masashi, Nakai, Miyuki, Igaki, Emiko
• Application Number:
  US11/021,982
• Publication Number:
  US 20050142447A1
• Time in Patent Office: Days
• US Class Current: 429/231.950
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0414 by screen printing
• CPC Class Codes: H01M 4/0426 Sputtering
• CPC Class Codes: H01M 4/0428 Chemical vapour deposition
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/1395 of electrodes based on metals, Si or alloys
• 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: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A negative electrode for a lithium secondary battery capable of storing and releasing lithium reversibly includes a collector, and a negative electrode material layer arranged on the collector. The negative electrode material layer contains a thin-film negative electrode material capable of storing and releasing lithium reversibly, and lithium non-storing portions containing a lithium non-storing material are arranged on at least one selected from the group consisting of a surface and an inside of the negative electrode material layer. In this way, a negative electrode for a lithium secondary battery capable of suppressing the deformation accompanying charging and discharging is provided.

Claims

1. A negative electrode for a lithium secondary battery capable of storing and releasing lithium reversibly, the negative electrode comprising:

a collector; and

a negative electrode material layer arranged on the collector;

wherein the negative electrode material layer comprises a thin-film negative electrode material capable of storing and releasing lithium reversibly, and

lithium non-storing portions comprising a lithium non-storing material are arranged on at least one selected from the group consisting of a surface and an inside of the negative electrode material layer.

2. The negative electrode for a lithium secondary battery according to claim 1, wherein the lithium non-storing portions are arranged on the surface of the negative electrode material layer.

3. The negative electrode for a lithium secondary battery according to claim 1, wherein the lithium non-storing portions are arranged on the collector, and the negative electrode material layer is arranged on the collector and the lithium non-storing portions.

4. The negative electrode for a lithium secondary battery according to claim 1, wherein an area of the lithium non-storing portions ranges from 1% to 15% of the area of a principal surface of the negative electrode material layer when seen from a direction perpendicular to the principal surface.

5. The negative electrode for a lithium secondary battery according to claim 1, wherein the lithium non-storing portions have at least one selected from the group consisting of an insular shape, a striped shape and a lattice shape when seen from a direction perpendicular to a principal surface of the negative electrode material layer.

6. The negative electrode for a lithium secondary battery according to claim 1, wherein when seen from a direction perpendicular to a principal surface of the negative electrode material layer, the lithium non-storing portions are arranged in a dispersed manner, and each of the lithium non-storing portions has an area ranging from 0.001 to 3 mm².

7. The negative electrode for a lithium secondary battery according to claim 1, wherein the lithium non-storing material comprises at least one selected from the group consisting of metal, a metal oxide, an organic low molecular weight compound and an organic high molecular weight compound.

8. The negative electrode for a lithium secondary battery according to claim 7, wherein the organic low molecular weight compound is a coupling agent.

9. The negative electrode for a lithium secondary battery according to claim 7, wherein the organic high molecular weight compound is at least one selected from the group consisting of rubber, a fluorocarbon resin, a thermosetting resin, a photosensitive resin and a silicone resin.

10. The negative electrode for a lithium secondary battery,according to claim 1, wherein the lithium non-storing material is a material having a repelling property to a nonaqueous solution containing lithium.

11. The negative electrode for a lithium secondary battery according to claim 10, wherein the material having the repelling property to the nonaqueous solution containing lithium is a coupling agent having a fluorine atom at its end.

12. The negative electrode for a lithium secondary battery according to claim 1, wherein the negative electrode material comprises at least one element selected from the group consisting of C, Si, Ge, Sn, Pb, Al, In, Zn, Cd and Bi.

13. A lithium secondary battery comprising:

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

a positive electrode capable of storing and releasing lithium reversibly; and

an electrolyte having a lithium conductivity.

14. A method for manufacturing a negative electrode for a lithium secondary battery capable of storing and releasing lithium reversibly, the method comprising:

(i) arranging a negative electrode material layer comprising a thin-film negative electrode material capable of storing and releasing lithium reversibly on a collector; and

(ii) arranging lithium non-storing portions comprising a lithium non-storing material on a surface of the negative electrode material layer.

15. The method according to claim 14, wherein the negative electrode material comprises at least one element selected from the group consisting of C, Si, Ge, Sn, Pb, Al, In, Zn, Cd and Bi, and

the (i) arranging is carried out by at least one selected from the group consisting of a physical vapor deposition, a chemical vapor deposition, sputtering, a sol-gel process and a vacuum deposition.

16. The method according to claim 14, wherein the (ii) arranging is carried out by at least one selected from the group consisting of application and printing.

17. The method according to claim 14, wherein in the (ii) arranging, the lithium non-storing portions are arranged so as to have at least one selected from the group consisting of an insular shape, a striped shape and a lattice shape when seen from a direction perpendicular to a principal surface of the negative electrode material layer.

18. A method for manufacturing a negative electrode for a lithium secondary battery capable of storing and releasing lithium reversibly, the method comprising:

(I) arranging lithium non-storing portions comprising a lithium non-storing material on a collector; and

(II) arranging a negative electrode material layer comprising a thin-film negative electrode material capable of storing and releasing lithium reversibly on the collector and the lithium non-storing portions.

19. The method according to claim 18, wherein the (I) arranging is carried out by at least one selected from the group consisting of application and printing.

20. The method according to claim 18, wherein in the (I) arranging, the lithium non-storing portions are arranged so as to have at least one selected from the group consisting of an insular shape, a striped shape and a lattice shape when seen from a direction perpendicular to a principal surface of the negative electrode material layer.

21. The method according to claim 18, wherein the negative electrode material comprises at least one element selected from the group consisting of C, Si, Ge, Sn, Pb, Al, In, Zn, Cd and Bi, and

the (II) arranging is carried out by at least one selected from the group consisting of a physical vapor deposition, a chemical vapor deposition, sputtering, a sol-gel process and a vacuum deposition.