Lithium-ion battery

• US 7,803,481 B2
• Filed: 09/25/2009
• Issued: 09/28/2010
• 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.
• Primary Examiner(s): RHEE, JANE J
• Application Number:
  US12/567,415
• Publication Number:
  US 20100015528A1
• Time in Patent Office: 368 Days
• Field of Search: 429/121, 429/231.95, 429/128
• US Class Current: 429/121
• 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,

a third active material, and

the auxiliary electrode being configured for a selective electrical connection to the positive electrode; and

at least one of a switch and a diode configured to implement the selective electrical connection as a function of at least one of the voltage difference between the positive and negative electrodes, the voltage difference between the positive and auxiliary electrodes, and the voltage difference between the negative and auxiliary electrodes;

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

the third active material exhibiting 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 for repeated selective electrical connection to the positive electrode.

3. The battery of claim 2, wherein the third active material does not include electrochemically active lithium.

4. The battery of claim 3, wherein the third active material comprises a material selected from the group consisting of V₂O₅, V₆O₁₃, V₃O₈, MoO₃, TiS₂, WO₂, MoO₂, RuO₂, and combinations thereof.

5. The battery of claim 1, wherein the auxiliary electrode is provided such that 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.

6. The battery of claim 5, wherein the auxiliary electrode is configured to be selectively electrically connected to the positive electrode using a switch.

7. The battery of claim 6, 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.

8. The battery of claim 6, 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 exceeds a predetermined value.

9. 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; and

a third electrode including

a third current collector and

a third active material provided on the third current collector,

the third electrode being configured for a repeated, selective electrical connection to the second electrode; and

at least one of a switch and a diode configured to implement the repeated, selective electrical connection as a function of at least one of the voltage difference between the first and second electrodes, the voltage difference between the first and third electrodes, and the voltage difference between the second and third electrodes;

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

10. The lithium-ion battery of claim 9, wherein the third electrode is provided such that it is electrically isolated from the first electrode and the second electrode within the battery, when not selectively connected to the second electrode.

11. The lithium-ion battery of claim 10, wherein the third active material comprises electrochemically active lithium.

12. The lithium-ion battery of claim 11, wherein the third active material comprises a material selected from the group consisting of LiMn₂O₄, Li_xVO₂, LiM_xMn_(2-x)O₄ (where M is a metal), and combinations thereof.

13. The lithium-ion battery of claim 10, wherein the third active material does not include electrochemically active lithium.

14. The lithium-ion battery of claim 13, wherein the third active material comprises a material selected from the group consisting of V₂O₅, V₆O₁₃, V₃O₈, MoO₃, TiS₂, WO₂, MoO₂, RuO₂, and combinations thereof.

15. A lithium-ion battery comprising:

a positive electrode comprising a positive current collector and a 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 negative electrode 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 electrode active material provided on at least one side of the auxiliary current collector,

the auxiliary electrode active material comprising a material selected from the group consisting of V₂O₅, V₆O₁₃, V₃O₈, MoO₃, TiS₂, WO₂, MoO₂, RuO₂, LiMn₂O₄, Li_xVO₂, LiM_xMn_(2-x)O₄ (where M is a metal), and combinations thereof;

the auxiliary electrode being configured for a selective electrical connection to at least one of the positive electrode and the negative electrode; and

at least one of a switch and a diode configured to implement the selective electrical connection as a function of at least one of the voltage difference between the positive and negative electrodes, the voltage difference between the positive and auxiliary electrodes, and the voltage difference between the negative and auxiliary electrodes.

16. 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 connected to the positive electrode or the negative electrode.

17. The lithium-ion battery of claim 16, wherein the at least one of a switch and a diode is provided external to the battery.

18. The lithium-ion battery of claim 15, further comprising a source of lithium in electrical contact with the negative electrode.

19. The lithium-ion battery of claim 18, wherein the source of lithium comprises at least one of a lithium patch and powdered lithium.

20. The lithium-ion battery of claim 19, 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 corresponding to formation of a solid-electrolyte interface.