(19)
(11) EP 1 255 261 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
08.01.2003 Bulletin 2003/02

(43) Date of publication:
06.11.2002 Bulletin 2002/45

(21) Application number: 01308740.8

(22) Date of filing: 15.10.2001
(51) International Patent Classification (IPC)7H01G 9/058
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 16.10.2000 JP 2000315563

(71) Applicants:
  • Nisshinbo Industries, Inc.
    Chuo-ku, Tokyo 103-8650 (JP)
  • ITOCHU CORPORATION
    Chuo-ku, Osaka-shi, Osaka 541-8577 (JP)

(72) Inventors:
  • Sato, Takaya, c/o Nisshinbo Industries
    Chiba-shi, Chiba-ken 267-0056 (JP)
  • Yoshida, Hiroshi, c/o Nisshinbo Industries
    Chiba-shi, Chiba-ken 267-0056 (JP)
  • Mitsuhashi, Hideto, c/o Nisshinbo Industries
    Chiba-shi, Chiba-ken 267-0056 (JP)
  • Minamiru, Shigenori, c/o Nisshinbo Industries
    Chiba-shi, Chiba-ken 267-0056 (JP)
  • Hashimoto, Zenzo
    Minato-ku, Tokyo 107-0061 (JP)
  • Shimizu, Tatsuo
    Minato-ku, Tokyo 107-0061 (JP)

(74) Representative: Stuart, Ian Alexander et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)

   


(54) Carbonaceous material, polarizable electrode for electrical double-layer capacitor, and electrical double-layer capacitor


(57) A carbonaceous material having a pore size distribution, as determined from a nitrogen adsorption isotherm, in which pores with a radius of up to 10 Å account for at most 70% of the total pore volume, and having a specific surface area, as measured by the nitrogen adsorption BET method, of 1-500 m2/g is optimized for the penetration of non-aqueous electrolyte solution to the interior thereof and the surface adsorption of ionic molecules so as to form an electrical double layer thereon. Electrical double-layer capacitors assembled using polarizable electrodes made with the carbonaceous material have a high voltage, a high energy density, a high capacitance, a long cycle life, and are amenable to miniaturization.