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Morphological effect on the electrochemical behavior of electric double-layer capacitors

Published online by Cambridge University Press:  31 January 2011

M. Endo ,
Y. J. Kim ,
T. Maeda ,
K. Koshiba ,
K. Katayam  and
M. S. Dresselhaus
M. Endo*
Affiliation:
Faculty of Engineering, Shinshu University, 4–17–1 Wakasato, Nagano 380–8533, Japan
Y. J. Kim
Affiliation:
Faculty of Engineering, Shinshu University, 4–17–1 Wakasato, Nagano 380–8533, Japan
T. Maeda
Affiliation:
Faculty of Engineering, Shinshu University, 4–17–1 Wakasato, Nagano 380–8533, Japan
K. Koshiba
Affiliation:
Faculty of Engineering, Shinshu University, 4–17–1 Wakasato, Nagano 380–8533, Japan
K. Katayam
Affiliation:
Faculty of Engineering, Shinshu University, 4–17–1 Wakasato, Nagano 380–8533, Japan
M. S. Dresselhaus
Affiliation:
Department of Physics and Department of Electrical Engineering, and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
*
a)Address all correspondence to this author. e-mail: [email protected]

Abstract

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Activated milled mesophase carbon fibers (AC-mMPCF, MP-series) show a higher specific capacitance in spite of a smaller specific surface area than those of powder-type activated carbons (AC-series). This phenomenon can be interpreted to mean that it is difficult to predict the capacitance of an electric double-layer capacitor (EDLC) knowing just the surface area and the pore size. More information is needed about other inherent characteristics of the samples, for example, the equivalent series resistance (ESR), shape of the pores, etc. We investigate here other characteristics of the samples. Consequently, it was deduced that the MP-series of EDLCs have a slit pore shape, which affects the accessibility of the electrolyte ion onto the electrode surface. Moreover, the MP-series of materials have suitable ESR values, and these material properties themselves should be considered as factors that affects the deterioration of the specific capacitance of EDLCs.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 12 , December 2001 , pp. 3402 - 3410
Copyright
Copyright © Materials Research Society 2001

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