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Characterization of Dielectric Energy Storage Mechanism and Achievement of Continuous Production Method for High Capacitance-targeted Ultracapacitors

Article of Honda R&D Technical Review Vol.18 No.2


To achieve high energy density activated carbon for use in ultracapacitors for automobiles, an activated carbon with twice the specific capacitance per unit volume compared to an isotropic activated carbon was developed. The hypothesis was that higher capacitance is related to the space-charge polarization of the inner edge plane. As well, the preparation of graphitizing carbon domains was researched. The high graphitizing activated carbons derived from new aromatic compounds demonstrate higher capacitance. Activated carbons obtained by conventional mass production have batch processing issues, such as contamination by metals generated by etched reactors, variation in capacitance within production batches, and generation of potassium metals. To resolve the above issues, we investigated a continuous mass-production process, and have successfully developed a new KOH activation process.


(1) Ue, M.: Denki Kagaku Capacitor you Dennkaieki, DENKI KAGAKU (Presently Electrochemistry), Vol. 66, No. 9, p. 904-911 (1998) (in Japanese)
(2) Morimoto, T., Hiratuka, K., Sawada, Y., Kurihara, K.: Electric double-layer capacitor using organic electrolyte, Journal of Power Sources, Vol. 60, p. 239-247 (1996)
(3) U. S. 5877935
(4) Fujino, T., Oyama, S., Oki, N., Noguchi, M., Sato, K., Endo, M., Kim, Y. J.: A characterization of alkaline-activated mesophase-based carbon for electrochemical capacitor, Mol. Cryst. Liq. Cryst., Vol. 388, p. [481]/67-[488]/74 (2002)
(5) Randin, J. P., Yeager, E.: Differential capacitance study on the edge orientation of pyrolytic graphite and glassy carbon electrodes, Electroanalytical Chemistry and Interfacial Electrochemistry, Vol. 58, p. 313-322 (1975)
(6) Morimoto, T.: Development and Industrialization of Electric Double-Layer Capacitors, Tanso, No. 214, p. 202-209 (2004)
(7) JP W2003/089371
(8) U. S. 6660583
(9) Mochida, I., Korai, Y., Kun, C. H., Watanabe, F., Sakai, Y.: Chemistry of synthesis, structure, preparation and application of aromatic-derived mesophase pitch, Carbon, Vol. 38, p. 305-328 (2002)
(10) Maeda, T., Kim, Y. J., Koshiba, K., Ishii, K., Kasai, T., Endo, M., Nishimura, Y., Kawabuchi, Y.: Activation Method of a Mesophase Pitch-based Carbon Fiber, Tanso, No. 201, p. 7-11 (2002)
(11) Kim, Y. J., Horie, Y., Matsuzawa, Y., Ozaki, S., Endo, M., Dresselhaus, M. S.: Structural features necessary to obtain a high specific capacitance in electric double layer capacitors, Carbon, Vol. 42, p. 2423-2432 (2004)

Author (organization or company)

Takeshi FUJINO(Automobile R&D Center)、Byoungju LEE(Automobile R&D Center)、Shigeki OYAMA(Automobile R&D Center)、Minoru NOGUCHI (Automobile R&D Center)

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