Raw material carbon composition for carbon material for electrode in electric double layer capacitor

• US 7,582,902 B2
• Filed: 12/21/2005
• Issued: 09/01/2009
• Est. Priority Date: 12/22/2004
• Status: Active Grant

• Current Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Original Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Inventors: Ikai, Keizou, Nakamo, Shiro, Oyama, Takashi, Ono, Hideki, Tano, Tamotsu, Takeshita, Kiwamu
• Primary Examiner(s): Pham; Long
• Application Number:
  US11/722,397
• Publication Number:
  US 20080144255A1
• Time in Patent Office: 1,350 Days
• Field of Search: 257/71, 257/296, 257/301, 257/E27.092, 257/E27.093
• US Class Current: 257/71
• CPC Class Codes: C01B 32/348 Metallic compounds
• CPC Class Codes: H01G 11/22 Electrodes
• CPC Class Codes: H01G 11/34 characterised by carbonisation or activation of carbon
• CPC Class Codes: H01G 11/44 Raw materials therefor, e.g. resins or coal
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

The present invention provides a raw material carbon composition that is converted to a carbon material for an electrode in an electric double layer capacitor that can develop a high level of electrostatic capacity with good reproducibility without producing any synthetic pitch. The raw material carbon composition is converted to a carbon material for an electrode in an electric double layer capacitor upon activation treatment and is characterized in that, when the raw material carbon composition is carbonized in an inert gas atmosphere at a temperature of 1000 to 1500° C., the true relative density (RD) and the total hydrogen content (TH %) in the carbonized material obtained after the burning satisfy the following formula (1):
RD=−0.75TH %+intercept  (1)
wherein the intercept is 2.160 or greater.

Claims

1. A raw material carbon composition that is converted to a carbon material for an electrode in an electric double layer capacitor upon activation treatment, the raw material carbon composition characterized in that, when the raw material carbon composition is carbonized in an inert gas atmosphere at a temperature of 1000 to 1500°

C, the true relative density (RD) and the total hydrogen content (TH%) in the carbonized material obtained after the burning satisfy the following formula (1);

RD=−

0.75 TH %+intercept 

 

(1)

wherein the intercept is 2.160 or greater.

2. The raw material carbon composition that is converted to a carbon material for an electrode in an electric double layer capacitor according to claim 1, characterized in that the raw material carbon composition has microcrystalline carbon similar to graphite.

3. A method for manufacturing a raw material carbon composition according to claim 1, comprising:

blending multiple kinds of starting raw material oils after adjusting the combination and/or the blending ratio thereof, and

coking the blended oils to.

4. A carbon material for an electrode in an electric double layer capacitor obtained by activating the raw material carbon composition according to claim 1.

5. The carbon material for an electrode in an electric double layer capacitor according to claim 4, characterized in that the activation treatment uses an alkali metal compound.

6. The carbon material for an electrode in an electric double layer capacitor according to claim 4, characterized in that the activation treatment is performed at a temperature ranging from 500 to 1000°

C.

7. An electric double layer capacitor characterized in that the electric double layer capacitor comprises an electrode containing the carbon material for an electrode according to claim 4.

8. A carbon material for an electrode in an electric double layer capacitor obtained by activating the raw material carbon composition according to claim 2.

9. The carbon material for an electrode in an electric double layer capacitor according to claim 8, characterized in that the activation treatment uses an alkali metal compound.

10. The carbon material for an electrode in an electric double layer capacitor according to claim 5, characterized in that the activation treatment is performed at a temperature ranging from 500 to 1000°

C.

11. The carbon material for an electrode in an electric double layer capacitor according to claim 8, characterized in that the activation treatment is performed at a temperature ranging from 500 to 1000°

C.

12. The carbon material for an electrode in an electric double layer capacitor according to claim 9, characterized in that the activation treatment is performed at a temperature ranging from 500 to 1000°

C.

13. An electric double layer capacitor characterized in that the electric double layer capacitor comprises an electrode containing the carbon material for an electrode according to claim 5.

14. An electric double layer capacitor characterized in that the electric double layer capacitor comprises an electrode containing the carbon material for an electrode according to claim 6.

15. An electric double layer capacitor characterized in that the electric double layer capacitor comprises an electrode containing the carbon material for an electrode according to claim 8.

16. An electric double layer capacitor characterized in that the electric double layer capacitor comprises an electrode containing the carbon material for an electrode according to claim 9.

17. An electric double layer capacitor characterized in that the electric double layer capacitor comprises an electrode containing the carbon material for an electrode according to claim 10.

18. An electric double layer capacitor characterized in that the electric double layer capacitor comprises an electrode containing the carbon material for an electrode according to claim 11.

19. An electric double layer capacitor characterized in that the electric double layer capacitor comprises an electrode containing the carbon material for an electrode according to claim 12.

20. A raw material carbon composition convertible to a carbon material for an electrode, which has an intercept value of 2.160 or greater as measured when true relative density (RiD) and total hydrogen content (TH %) of a carbonized material of the raw material carbon composition are plotted using the following formula (1):

RD=−

0.75 TH %+intercept 

 

(1)

said carbonized material being obtained by carbonizing the raw material carbon composition in an inert gas atmosphere at a temperature of 1000 to 1500°

C.

21. The raw material carbon composition according to claim 20, wherein the raw material carbon composition contains microcrystalline carbon similar to graphite.

22. The raw material carbon composition according to claim 20, which is a heavy oil mixture comprising bottom oil in a fluid catalytic cracker for petroleum heavy oil mixed with a vacuum residue in a vacuum distillation apparatus.