Claims
- 1. A method of producing a nonporous carbon having crystallites of a graphite-like carbon and a specific surface area of less than 270 m2/g, said crystallites having an interplanar spacing d002 of 0.360 to 0.380 nm, said method comprising the steps of:
preparing an easily graphitizable carbon in which multilayer crystallites of graphite have been developed; dry distilling said carbon at 700° C.-850° C. to obtain a calcined carbon; treating said obtained calcined carbon with a caustic alkali at 800° C.-900° C.; and removing the remaining alkali.
- 2. A method of producing a nonporous carbon having crystallites of a graphite-like carbon and a specific surface area of less than 270 m2/g, said crystallites having an interplanar spacing d002 of 0.360 to 0.380 nm, said method comprising the steps of:
preparing an easily graphitizable carbon in which multilayer crystallites of graphite have been developed; dry distilling said carbon at 700° C.-850° C. to obtain a calcined carbon; treating said obtained calcined carbon together with a caustic alkali at 800° C.-900° C.; removing the remaining alkali to obtain a nonporous carbon; and treating the obtained nonporous carbon at 500° C.-900° C. within a reducing atmosphere.
- 3. A method of producing a nonporous carbon as set forth in claim 1 or 2, wherein said carbon has a specific surface area of less than 100 m2/g.
- 4. A method of producing a nonporous carbon as set forth in claim 1 or 2, wherein said caustic alkali is at least one selected from the group consisting of KOH, CsOH, and RbOH.
- 5. A nonporous carbon for use in an electric double-layer capacitor, said nonporous carbon comprising:
crystallites of a graphite-like carbon having a specific surface area of less than 270 m2/g and an interplanar spacing d002 of 0.360 to 0.380 nm.
- 6. A nonporous carbon for use in an electric double-layer capacitor, said nonporous carbon comprising:
crystallites of a graphite-like carbon having a specific surface area of less than 270 m2/g and an interplanar spacing d002 of 0.360 to 0.380 nm; said nonporous carbon showing a short relaxation time constant T2=18-50 μsec (Gaussian type), a moderate relaxation time component T2=100 to 400 μsec (Lorentzian type), and a long relaxation time component T2=500 to 2000 μsec or longer (Lorentzian type) when 1H resonance is observed at room temperature by pulse NMR, said relaxation time components indicating different states of bond of hydrogen atoms left within the carbon structure; and wherein the ratio of the sum of the moderate and long relaxation times to the short relaxation time is less than one third.
- 7. A nonporous carbon for use in an electric double-layer capacitor as set forth in claim 5 or 6, wherein said nonporous carbon has a specific surface area of less than 100 m2/g.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-201849 |
Jul 2000 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a division of application Ser. No. 09/897,726 filed Jul. 2, 2001 entitled “Electric Double Layer Capacitor and Carbon and Material Therefor.”
Divisions (1)
|
Number |
Date |
Country |
Parent |
09897726 |
Jul 2001 |
US |
Child |
10695225 |
Oct 2003 |
US |