Claims
- 1. A method for producing an activated carbon material, wherein the method comprises a step of thermally treating coal-based pitch at two temperature ranges of 400° C. to 600° C. and 600° C. to 900° C.; and a step of mixing and heating the thus-treated coal-based pitch with an alkali metal compound for the activation thereof.
- 2. The method for producing an activated carbon material as claimed in claim 1, wherein the alkali metal compound is at least one alkali hydroxide selected from the group consisting of sodium hydroxide, potassium hydroxide, and cesium hydroxide.
- 3. The method for producing an activated carbon material as claimed in claim 1, wherein the step of thermally treating coal-based pitch at two temperature ranges is carried out in a vapor of an alkali metal.
- 4. The method for producing an activated carbon material as claimed in claim 3, wherein the alkali metal compound is at least one species selected from the group consisting of potassium, sodium, and cesium compounds.
- 5. The method for producing an activated carbon material as claimed in claim 1, wherein the step for the activation comprises adding a fibrous material to the coal-based pitch.
- 6. The method for producing an activated carbon material as claimed in claim 5, wherein the amount of the fibrous material is not less than 0.05 mass % as a corresponding mass of the fibrous material heated at 800° C. in an inert atmosphere on the basis of the coal-based pitch.
- 7. The method for producing an activated carbon material as claimed in claim 5 or 6, wherein the outer diameter of each fiber filament of the fibrous material is 1000 nm or less.
- 8. The method for producing an activated carbon material as claimed in any one of claims 5 to 7, wherein the fibrous material is a material capable of maintaining its shape up to at least 300° C.
- 9. The method for producing an activated carbon material as claimed in any one of claims 5 to 8, wherein the fibrous material is at least one species selected from the group consisting of a fibrous carbon, carbonized material of organic fiber, unmeltable fiber, beaten pulp and cellulose fiber.
- 10. The method for producing an activated carbon material as claimed in claim 9, wherein the fibrous carbon is at least one species selected from the group consisting of a carbon nano tube, whiskers, vapor grown carbon fiber, carbon fiber ribbon and coiled carbon fiber.
- 11. The method for producing an activated carbon material as claimed in claim 10, wherein each fiber filament of the vapor grown carbon fiber contains a hollow space extending along its center axis, and has an outer diameter of 2 to 500 nm and an aspect ratio of 10 to 15,000.
- 12. The method for producing an activated carbon material as claimed in claim 11, wherein the vapor grown carbon fiber is branched carbon fiber.
- 13. An activated carbon material produced through a production method as recited in any one of claims 1 to 12.
- 14. The activated carbon material as claimed in claim 13, which has a BET specific surface area of 10 to 1,000 m2/g as measured by means of a nitrogen adsorption method, and contains no graphite microcrystals.
- 15. The activated carbon material as claimed in claim 13 or 14, wherein the ratio of the height of the D peak (1,360 cm−1) of a Raman spectrum of the activated carbon material to that of the G peak (1,580 cm−1) of the Raman spectrum is 0.8 to 1.2.
- 16. The activated carbon material as claimed in any one of claims 13 to 15, wherein pores of the activated carbon material having a size of 20 to 50 Å as measured by means of a BJH method employing nitrogen adsorption have a pore volume of at least 0.02 ml/g.
- 17. A polarizable electrode material comprising a activated carbon material as recited in any one of claims 13 to 16 and optionally vapor grown carbon fiber.
- 18. The polarizable electrode material as claimed in claim 17, wherein the amount of the vapor grown carbon fiber is 0.05 to 50 mass %.
- 19. The polarizable electrode material as claimed in claim 17 or 18, wherein each fiber filament of the vapor grown carbon fiber contains a hollow space extending along its center axis, and has an outer diameter of 2 to 500 nm and an aspect ratio of 10 to 15,000.
- 20. The polarizable electrode material as claimed in any one of claims 17 to 19, wherein the vapor grown carbon fiber contains micropores having a pore volume of 0.01 to 0.4 ml/q, and has a BET specific surface area of 30 to 1,000 m2/g as measured by means of a nitrogen adsorption method.
- 21. An electric double layer capacitor comprising a polarizable electrode prepared from a polarizable electrode material as recited in any one of claims 17 to 20.
- 22. A method for producing an activated carbon material, wherein the method comprises adding an alkali metal compound as an activating agent and a fibrous material to a carbonaceous raw material and heating the mixture.
- 23. The method for producing an activated carbon material as claimed in claim 22, wherein the amount of the fibrous material is not less than 0.05 mass % as a corresponding mass of the fibrous material heated at 800° C. in an inert atmosphere on the basis of the carbonaceous raw material.
- 24. The method for producing an activated carbon material as claimed in claim 22 or 23, wherein the outer diameter of each fiber filament of the fibrous material is 1000 nm or less.
- 25. The method for producing an activated carbon material as claimed in any one of claims 22 to 24, wherein the fibrous material is a material capable of maintaining its shape up to at least 300° C.
- 26. The method for producing an activated carbon material as claimed in any one of claims 22 to 25, wherein the fibrous material is at least one species selected from the group consisting of a fibrous carbon, carbonized material of organic fiber, unmeltable fiber, beaten pulp and cellulose fiber.
- 27. The method for producing an activated carbon material as claimed in claim 26, wherein the fibrous carbon is at least one species selected from the group consisting of a carbon nano tube, whiskers, vapor grown carbon fiber, carbon fiber ribbon and coiled carbon fiber.
- 28. The method for producing an activated carbon material as claimed in claim 27, wherein each fiber filament of the vapor grown carbon fiber contains a hollow space extending along its center axis, and has an outer diameter of 2 to 500 nm and an aspect ratio of 10 to 15,000.
- 29. The method for producing an activated carbon material as claimed in claim 28, wherein the vapor grown carbon fiber is branched carbon fiber, and each fiber filament of the branched carbon fiber contains a hollow space extending throughout the filament, including a branched portion thereof.
- 30. An activated carbon material having a fibrous material fused onto at least a portion of the surface of the activated carbon material particle.
- 31. The activated carbon material as claimed in claim 30, which assumes a spherical shape.
- 32. An activated carbon material produced through a method for producing an activated carbon material as recited in any one of claims 22 to 29.
- 33. A polarizable electrode comprising, as an electrode material, an activated carbon material as recited in any one of claims 30 to 32.
- 34. An electric double layer capacitor comprising a polarizable electrode as recited in claim 33.
Priority Claims (3)
Number |
Date |
Country |
Kind |
2001-274375 |
Sep 2001 |
JP |
|
2001-357735 |
Nov 2001 |
JP |
|
2002-109638 |
Apr 2002 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is based on the provisions of 35 U.S.C. Article 111(a) with claiming the benefit of filing dates of U.S. provisional application Serial No. 60/318,623 filed on Sep. 13, 2001 and No. 60/380,858 filed on May 17, 2002 under the provisions of 35 U.S.C. 111(b), pursuant to 35 U.S.C. Article 119(e)(1).
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP02/09151 |
9/9/2002 |
WO |
|