Capacitor and method for producing a capacitor

• US 20060227496A1
• Filed: 05/25/2006
• Published: 10/12/2006
• Est. Priority Date: 09/30/2002
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc), Kemet Electronics Corporation (Yageo Corporation)
• Original Assignee: Medtronic Incorporated (Medtronic Plc), Kemet Electronics Corporation (Yageo Corporation)
• Inventors: Kinard, John Tony, Schott, Joachim Hossick, Melody, Brian
• Granted Patent: US 7,499,260 B2
• Time in Patent Office: Days
• US Class Current: 361/503
• CPC Class Codes: A61N 1/3975 Power supply A61N1/378 takes precedence
• CPC Class Codes: H01G 11/30 characterised by their material
• CPC Class Codes: H01G 11/32 Carbon-based
• CPC Class Codes: H01G 9/008 Terminals
• CPC Class Codes: H01G 9/042 characterised by the material H01G11/22 takes precedence
• CPC Class Codes: H01G 9/0425 specially adapted for cathode
• CPC Class Codes: H01G 9/06 Mounting in containers
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

An electrode for an electrolytic capacitor includes a substrate comprising titanium; a carbide layer adjacent the substrate; and a carbonaceous layer adjacent the carbide layer and including means for enhancing the capacitance of the electrode.

Claims

1. An electrode for an electrolytic capacitor comprising:

a substrate comprising titanium;

a carbide layer adjacent the substrate; and

a carbonaceous layer adjacent the carbide layer and including means for enhancing the capacitance of the electrode.

2. The electrode of claim 1, wherein the means for enhancing the capacitance of the electrode comprises activated carbon.

3. The electrode of claim 2, wherein the activated carbon includes functional groups that include oxygen, the functional groups being selected from CO, COOH, and C═

O.

4. The electrode of claim 2, wherein the means for enhancing the capacitance of the electrode further comprises an oxide of manganese.

5. The electrode of claim 1, wherein the carbide layer comprises titanium.

6. The electrode of claim 1, wherein the electrode is a cathode for an electrolytic capacitor.

7. The electrode of claim 1, wherein the electrode has a capacitance of greater than approximately 10 milliFarads per square centimeter.

8. The electrode of claim 1, wherein the substrate has a roughness of between approximately 2 and 5 micrometers.

9. The electrode of claim 1, wherein the thickness of the carbide layer is less than approximately 10 nanometers.

10. A capacitor comprising:

a cathode;

an anode; and

an electrolyte provided intermediate the cathode and the anode;

wherein the cathode comprises;

a substrate comprising titanium;

a carbide layer adjacent the substrate; and

a carbonaceous layer adjacent the carbide layer comprising a material for enhancing the capacitance of the electrode.

11. The capacitor of claim 10, wherein the material for enhancing the capacitance of the electrode comprises activated carbon and an oxide of manganese.

12. The capacitor of claim 10, wherein the carbide layer comprises titanium.

13. The capacitor of claim 10, wherein the cathode has a capacitance of greater than approximately 10 milliFarads per square centimeter.

14. The capacitor of claim 10, wherein the substrate has a roughness of between approximately 2 and 5 micrometers.

15. The capacitor of claim 10, wherein the thickness of the carbide layer is less than approximately 10 nanometers.

16. An implantable medical device comprising:

an electrolytic capacitor having a cathode, an anode, and an electrolyte intermediate the cathode and the anode;

wherein the cathode comprises;

a substrate comprising titanium;

a carbide layer adjacent the substrate; and

a carbonaceous layer adjacent the carbide layer comprising a material for enhancing the capacitance of the electrode;

wherein the implantable medical device is configured to provide a therapeutic high voltage treatment.

17. The implantable medical device of claim 16, wherein the material for enhancing the capacitance of the electrode comprises activated carbon and an oxide of manganese.

18. The implantable medical device of claim 16, wherein the carbide layer comprises titanium.

19. The implantable medical device of claim 16, wherein the cathode has a capacitance of greater than approximately 10 milliFarads per square centimeter.

20. The implantable medical device of claim 16, wherein the thickness of the carbide layer is less than approximately 10 nanometers.