LITHIUM-ION BATTERY

• US 20100009245A1
• Filed: 07/29/2009
• Published: 01/14/2010
• Est. Priority Date: 10/29/2004
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Howard, William G., Scott, Erik R., Schmidt, Craig L.
• Granted Patent: US 7,794,869 B2
• Time in Patent Office: Days
• US Class Current: 429/61
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• 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 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• 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: Y02E 60/10 Energy storage using batteries

Abstract

A battery includes a positive electrode having a current collector and a first active material and a negative electrode having a current collector and a second active material. The battery also includes an auxiliary electrode having a current collector and a third active material. The auxiliary electrode is configured for selective electrical connection to one of the positive electrode and the negative electrode. The first active material, second active material, and third active material are configured to allow doping and undoping of lithium ions. The third active material exhibits charging and discharging capacity below a corrosion potential of the current collector of the negative electrode and above a decomposition potential of the first active material.

Claims

1. A battery comprising:

a positive electrode comprising

a current collector and

a first active material;

a negative electrode comprising

a current collector and

a second active material; and

an auxiliary electrode comprising

a current collector and

a third active material;

wherein the auxiliary electrode is configured for selective electrical connection to the negative electrode;

wherein the first active material, the second active material, and the third active material are configured to allow doping and undoping of lithium ions; and

wherein the third active material exhibits charging and discharging capacity below a corrosion potential of the current collector of the negative electrode and above a decomposition potential of the first active material.

2. The battery of claim 1, wherein the auxiliary electrode is configured to be selectively electrically connected to and disconnected from the negative electrode using a mechanism provided external to the battery.

3. The battery of claim 1, wherein the battery is configured to electrically connect the auxiliary electrode to the negative electrode when the potential of the negative electrode exceeds the potential of the auxiliary electrode by a predetermined value.

4. The battery of claim 3, wherein the auxiliary electrode is configured to be selectively electrically connected to and disconnected from the negative electrode using a switch.

5. The battery of claim 4, wherein the switch is configured to selectively electrically connect the auxiliary electrode when the difference in voltage between the positive electrode and the negative electrode falls below a predetermined value.

6. The battery of claim 5, wherein the switch is configured to selectively electrically disconnect the auxiliary electrode when the difference in voltage between the positive electrode and the negative electrode exceeds the predetermined value.

7. A lithium-ion battery comprising:

a first electrode including

a first current collector and

a first active material provided on the first current collector;

a second electrode including

a second current collector and

a second active material provided on the second current collector,

wherein the second electrode is a negative electrode; and

a third electrode including

a third current collector and

a third active material provided on the third current collector,

wherein the third electrode is configured for selective electrical coupling to and decoupling from the second electrode; and

wherein the third active material exhibits charge and discharge capacity below a corrosion potential of the second current collector and above a decomposition potential of the first active material.

8. The lithium-ion battery of claim 7, wherein the third electrode is provided such that it is electrically isolated from the first electrode and the second electrode within the battery.

9. The lithium-ion battery of claim 7, further comprising a source of lithium in electrical contact with the third electrode.

10. The lithium-ion battery of claim 9, wherein the source of lithium comprises at least one of a lithium patch and a powdered lithium.

11. The lithium-ion battery of claim 7, wherein the third active material comprises electrochemically active lithium.

12. The lithium-ion battery of claim 7, further comprising a source of lithium provided in electrical contact with the second electrode.

13. The lithium-ion battery of claim 12, wherein the source of lithium comprises at least one of a lithium patch and a powdered lithium.

14. The lithium-ion battery of claim 13, wherein the source of lithium is configured to provide a lithium capacity for the first electrode sufficient to at least compensate for irreversible loss of capacity of the first electrode.

15. A lithium-ion battery comprising:

a positive electrode comprising

a positive current collector and

an positive electrode active material provided on at least one side of the positive current collector;

a negative electrode comprising

a negative current collector and

a primary active material provided on at least one side of the negative current collector; and

an auxiliary electrode comprising

an auxiliary current collector and

an auxiliary active material provided on at least one side of the auxiliary current collector,

wherein the auxiliary active material includes a quantity of lithium;

wherein the auxiliary electrode is configured to be selectively coupled to the negative electrode when a predetermined condition is present;

wherein the quantity of lithium provides sufficient electrochemically cyclable lithium to allow the positive electrode active material and the primary active material provided on the negative collector to exhibit charging and discharging capacity for the negative electrode below the corrosion potential of the negative current collector and for the positive electrode above the decomposition potential of the positive electrode active material.

16. The lithium-ion battery of claim 15, wherein the positive electrode active material comprises a material selected from the group consisting of LiCoO₂, a material having the form LiCo_xNi₍₁₋

x)O₂, a material having the form LiCo_xMn_yNi_zO₂, and a material having the form LiNi_xCo_yAl_zO₂.

17. The lithium-ion battery of claim 15, wherein the auxiliary electrode is electrically isolated from the positive electrode and the negative electrode within the battery, when not selectively coupled to the positive electrode or the negative electrode.

18. The lithium-ion battery of claim 17, wherein the auxiliary electrode is configured to be selectively electrically connected to and disconnected from the negative electrode using a mechanism provided external to the battery.

19. The lithium-ion battery of claim 18, wherein the mechanism is a switch and the switch is configured to electrically connect the auxiliary electrode to the negative electrode when a voltage difference between the positive electrode and the negative electrode falls below a predetermined value.

20. The lithium-ion battery of claim 19, wherein the switch is configured to electrically disconnect the auxiliary electrode from the negative electrode when a voltage difference between the positive electrode and the negative electrode exceeds a predetermined value.

21. A battery comprising:

a positive electrode comprising a current collector and a first active material;

a negative electrode comprising a current collector and a second active material; and

an auxiliary electrode comprising a current collector and a third active material, the auxiliary electrode configured for repeated, selective electrical connection to the negative electrode when the potential of the negative electrode exceeds the potential of the auxiliary electrode by a predetermined value, the third active material providing excess capacity to the negative electrode when the auxiliary electrode is electrically connected to the negative electrode;

wherein the first active material, second active material, and third active material are configured to allow doping and undoping of lithium ions; and

wherein the third active material exhibits charging and discharging capacity below a corrosion potential of the current collector of the negative electrode and above a decomposition potential of the first active material.

22. The battery of claim 21, wherein the auxiliary electrode is provided such that it is electrically isolated from the positive electrode and the negative electrode within the battery.

23. The battery of claim 22, wherein the auxiliary electrode is configured to be selectively electrically connected to and disconnected from the negative electrode using a mechanism provided external to the battery.

24. The battery of claim 21, wherein the battery is configured to electrically connect the auxiliary electrode to the negative electrode when the potential of the negative electrode exceeds the potential of the auxiliary electrode by a predetermined value.

25. The battery of claim 21, wherein the auxiliary electrode is configured to be selectively electrically connected to and disconnected from the negative electrode using a switch.

26. The battery of claim 25, wherein the switch is configured to selectively electrically connect the auxiliary electrode when the difference in voltage between the positive electrode and the negative electrode falls below a predetermined value.

27. The battery of claim 26, wherein the switch is configured to selectively electrically disconnect the auxiliary electrode when the difference in voltage between the positive electrode and the negative electrode exceeds a predetermined value.

28. The battery of claim 21, further comprising a source of lithium in electrical contact with the negative electrode.

29. The battery of claim 28, wherein the source of lithium comprises at least one of a lithium patch and powdered lithium.

30. The battery of claim 28, wherein the source of lithium is configured to provide a lithium capacity for the negative electrode sufficient to at least compensate for irreversible loss of capacity of the negative electrode.