LITHIUM-ION BATTERY

• US 20080044728A1
• Filed: 07/13/2007
• Published: 02/21/2008
• Est. Priority Date: 10/29/2004
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Jain, Gaurav, Howard, William, Schmidt, Craig, Scott, Erik
• Application Number:
  US11/777,609
• Publication Number:
  US 20080044728A1
• Time in Patent Office: Days
• US Class Current: 429/221
• CPC Class Codes: A61N 1/378 Electrical supply
• CPC Class Codes: H01M 10/0566 Liquid materials
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• 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 4/485 of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy H01M4/505, H01M4/525 take precedence
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• 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 lithium-ion battery a lithium-ion battery that includes a first electrode that includes a first current collector having a first active material provided on at least one surface thereof The battery also includes a second electrode that includes a second current collector having a second active material provided on at least one surface thereof The second active material has a potential that is greater than 0.2 volts versus a lithium reference electrode. The first and second electrodes are folded accordion-style to form a cell element having a plurality of generally planar regions and a plurality of curved regions. The first active material forms a substantially continuous coating along substantially the entire length of the first current collector.

Claims

1. A lithium-ion battery comprising:

a first electrode comprising first current collector having a first active material provided on at least one surface thereof,

a second electrode comprising second current collector having a second active material provided on at least one surface thereof, the second active material having a potential that is greater than 0.2 volts versus a lithium reference electrode;

wherein the first and second electrodes are folded accordion-style to form a cell element having a plurality of generally planar regions and a plurality of curved regions;

wherein the first active material forms a substantially continuous coating along substantially the entire length of the first current collector;

whereby the second active material is configured to eliminate the need to provide uncoated areas of the first current collector in a plurality of the curved regions.

2. The lithium-ion battery of claim 1, wherein the second active material has a potential that is greater than 0.3 volts versus a lithium reference electrode.

3. The lithium-ion battery of claim 1, wherein the second active material has a potential that is approximately 1.5 volts versus a lithium reference electrode.

4. The lithium-ion battery of claim 1, wherein the second active material is a lithium titanate material.

5. The lithium-ion battery of claim 4, wherein the lithium titanate material is Li₄Ti₅O₁₂.

6. The lithium-ion battery of claim 1, wherein the second active material is a lithium titanate material selected from the group consisting of LiTi₂O₄, Li₂TiO₃, Li_xTi_yO₄, and combinations thereof.

7. The lithium-ion battery of claim 1, wherein the second active material is selected from the group consisting of TiO₂, WO₂, WO₃, MoO₂, Nb₂O₅, LiWO₂, Li_xMoO₂, V₆O₁₃, Li₆Fe₂O₃, LiFeO₂, Fe₂O₃, and combinations thereof.

8. The lithium-ion battery of claim 1, wherein the lateral edges of the first and second electrodes are substantially aligned and the second active material provided on the second current collector does not extend beyond the lateral edges of the first electrode.

9. The lithium-ion battery of claim 8, wherein the second active material does not extend beyond the first active material near the lateral edges of the first and second electrodes.

10. The lithium-ion battery of claim 1, wherein the second current collector comprises aluminum.

11. The lithium-ion battery of claim 1, wherein the first active material has a potential of at least 3.0 versus a lithium reference electrode.

12. A lithium-ion battery comprising:

a cell element comprising a positive electrode and a negative electrode provided in facing relationship and folded accordion-style, wherein the positive electrode comprises a positive current collector and a positive active material provided on at least one surface thereof and the negative electrode comprises a negative current collector having a negative active material provided on at least one surface thereof, the negative active material having a potential that is greater than 0.2 volts versus a lithium reference electrode;

wherein the cell element includes at least one curved area in which the radius of curvature of the positive electrode is greater than the radius of curvature of the negative electrode and the positive active material is not discontinuous in the at least one curved area.

13. The lithium-ion battery of claim 12, wherein the negative active material has a potential that is greater than 0.3 volts versus a lithium reference electrode.

14. The lithium-ion battery of claim 12, wherein the negative active material has a potential that is approximately 1.5 volts versus a lithium reference electrode.

15. The lithium-ion battery of claim 12, wherein the negative active material is selected from the group consisting of LiTi₂O₄, Li₂TiO₃, Li_xTi_yO₄, Li₄Ti₅O₁₂, TiO₂, WO₂, WO₃, MoO₂, Nb₂O₅, LiWO₂, Li_xMoO₂, V₆O₁₃, Li₆Fe2O₃, LiFeO₂, Fe₂O₃, and combinations thereof.

16. The lithium-ion battery of claim 12, wherein the negative active material is comprises Li₄Ti₅O₁₂.

17. The lithium-ion battery of claim 12, wherein the positive and negative electrodes included edges that are provided proximate each other in a region and the negative active material does not extend beyond the positive active material in the region.

18. The lithium-ion battery of claim 12, wherein the positive and negative electrodes included edges that are provided proximate each other in a region and the negative active material does not extend beyond the edge of the positive electrode in the region.

19. A lithium-ion battery comprising:

a cell element comprising a positive electrode and a negative electrode provided in facing relationship and folded accordion-style, wherein the positive electrode comprises a positive current collector and a positive active material and the negative electrode comprises a negative current collector and a negative active material, the negative active material having a potential that is greater than 0.2 volts versus a lithium reference electrode;

wherein the cell element includes a plurality of generally planar regions, a first plurality of curved regions in which the positive electrode has a larger radius than the negative electrode, and a second plurality of curved regions in which the negative electrode has a larger radius than the negative electrode; and

wherein the positive active material extends along substantially the entire length of the positive current collector without being discontinuous in the second plurality of curved regions.

20. The lithium-ion battery of claim 19, wherein the negative active material has a potential that is greater than 0.3 volts versus a lithium reference electrode.

21. The lithium-ion battery of claim 19, wherein the negative active material has a potential that is approximately 1.5 volts versus a lithium reference electrode.

22. The lithium-ion battery of claim 19, wherein the positive and negative electrodes included edges that are provided proximate each other in a region and the negative active material does not extend beyond the positive active material in the region.

23. The lithium-ion battery of claim 22, wherein the region is in the area of a lateral edge of the electrodes.

24. The lithium-ion battery of claim 22, wherein the region is in the area of at least one of a leading edge and a trailing edge of the electrodes.

25. The lithium-ion battery of claim 22, wherein the positive active material extends beyond the negative active material in the region.

26. The lithium-ion battery of claim 19, wherein the positive and negative electrodes included edges that are provided proximate each other in a region and the negative active material does not extend beyond the edge of the positive electrode in the region.

27. The lithium-ion battery of claim 19, wherein the negative active material is selected from the group consisting of LiTi₂O₄, Li₂TiO₃, Li_xTi_yO₄, Li₄Ti₅O₁₂, TiO₂, WO₂, WO₃, MoO₂, Nb₂O₅, LiWO₂, Li_xMoO₂, V₆O₁₃, Li₆Fe2O₃, LiFeO₂, Fe₂O₃, and combinations thereof.

28. The lithium-ion battery of claim 19, wherein the negative active material is Li₄Ti₅O₁₂.