Electric double layer capacitor using polarizable electrode of single particle layer

• US 6,198,621 B1
• Filed: 02/02/1999
• Issued: 03/06/2001
• Est. Priority Date: 02/05/1998
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Saito, Takashi, Kibi, Yukari
• Primary Examiner(s): Dinkins, Anthony
• Application Number:
  US09/243,310
• Time in Patent Office: 763 Days
• Field of Search: 361/502, 361/508, 361/512, 361/516, 361/528, 361/532, 29/250.3, 502/416, 423/445.R
• US Class Current: 361/502
• CPC Class Codes: H01G 11/24 characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
• CPC Class Codes: H01G 11/28 arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
• CPC Class Codes: H01G 11/34 characterised by carbonisation or activation of carbon
• CPC Class Codes: H01G 11/68 characterised by their material
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A polarizable electrode includes an collector electrode, and a single particle layer including carbon particles and formed on the collector electrode. A part of each of the carbon particles of the single particle layer is embedded in the collector electrode. The polarizable electrode is used for an electric double layer capacitor.

Claims

1. A polarizable electrode for an electric double layer capacitor, comprising:

a collector electrode; and

a single particle layer including carbon particles and formed on said collector electrode, wherein a part of each of said carbon particles of said single particle layer is embedded in said collector electrode.

2. A polarizable electrode according to claim 1, wherein said carbon particles of said single particle layer are activated carbon particles.

3. A polarizable electrode according to claim 2, wherein each of said carbon particles of said single particle layer is formed of a material selected from the group consisting of an activated carbon powder, a composite material made of activated carbon and polyacen, a composite material made of activated carbon and a carbon composite material, and a mixture thereof.

4. A polarizable electrode according to claim 1, wherein each of said carbon particles is substantially spherical in shape.

5. A polarizable electrode according to claim 4, wherein said carbon particles have an average particle diameter in a range equal to or greater than 5 μ

m and equal to or less than 500 μ

m.

6. A polarizable electrode according to claim 5, wherein said carbon particles have an average particle diameter in a range equal to or greater than 150 μ

m and equal to or less than 250 μ

m.

7. A polarizable electrode according to claim 1, wherein each of said carbon particles is substantially ellipsoidal in shape.

8. A polarizable electrode according to claim 7, wherein said carbon particles have a ratio of a short diameter to a long diameter of ⅗

.

9. A polarizable electrode according to claim 8, wherein said carbon particles have the short diameter and the long diameter in a range of 150 μ

m to 250 μ

m.

10. A polarizable electrode according to claim 1, wherein said collector electrode is made of a material selected from the group consisting of a conductive rubber, a conductive elastomer, a conductive polymer, and a composite material thereof.

11. A polarizable electrode according to claim 1, wherein said collector electrode is made of a composite material of a metal film and a material selected from the group consisting of a conductive rubber, a conductive elastomer, a conductive polymer and a composite material thereof.

12. An electric double layer capacitor comprising:

a pair of polarizable electrodes, each of which includes a collector electrode and a single particle layer of carbon particles formed on said collector electrode, wherein a part of each of said carbon particles of said single particle layer is embedded in said collector electrode;

gaskets disposed between said collector electrodes to seal an electrolyte; and

a separator disposed between said polarizable electrodes.

13. An electric double layer capacitor according to claim 12, wherein said carbon particles of said single particle layer are activated carbon particles.

14. An electric double layer capacitor according to claim 12, wherein each of said carbon particles of said single particle layer is formed of a material selected from the group consisting of an activated carbon powder, a composite material made of activated carbon and polyacen, a composite material made of activated carbon and a carbon composite material, and a mixture thereof.

15. An electric double layer capacitor according to claim 12, wherein each of said carbon particles is substantially spherical in shape.

16. An electric double layer capacitor according to claim 15, wherein said carbon particles have an average particle diameter in a range equal to or greater than 5 μ

m and equal to or less than 500 μ

m.

17. An electric double layer capacitor according to claim 16, wherein said carbon particles have an average particle diameter in a range equal to or greater than 150 μ

m and equal to or less than 250 μ

m.

18. An electric double layer capacitor according to claim 12, wherein each of said carbon particles is substantially ellipsoidal in shape.

19. An electric double layer capacitor according to claim 18, wherein said carbon particles have a ratio of a short diameter to a long diameter of ⅗

.

20. An electric double layer capacitor according to claim 19, wherein said carbon particles have the short diameter and the long diameter in a range of 150 μ

m to 250 μ

m.

21. An electric double layer capacitor according to claim 12, wherein said collector electrode is made of a material selected from the group consisting of a conductive rubber, a conductive elastomer, a conductive polymer, and a composite material thereof.

22. An electric double layer capacitor according to claim 12, wherein said collector electrode is made of a composite material of a metal film and a material selected from the group consisting of a conductive rubber, a conductive elastomer, a conductive polymer and a composite material thereof.