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Title: High-capacity electric double-layer capacitor with high-density-activated carbon fiber electrodes

Abstract

Recently the authors have presented a method to prepare activated carbon fiber with high bulk density (HD-ACF) without using any binders. The possibility of using the HD-ACF as an electrode for electric double-layer capacitors (EDLCs) was examined in this paper. The capacitance of the EDLC with the HD-ACF electrode increased with the increase of bulk density of the HD-ACF, indicating that individual fibers are highly packed without losing their capacitance. The capacitance also increased in proportion to the size of the HD-ACF electrode. The initial discharge current of the EDLC showed little dependency on either the bulk density or the size of the HD-ACF electrode. These results clarified that the HD-ACF electrode is suitable for constructing a high-power EDLC. The initial discharge current was directly proportional to the conductivity of aqueous KCI used as the electrolyte, indicating that the resistance of the electrolyte is much higher than that of the HD-ACF electrode. This result showed that the efficiency of the HD-ACF was well above the efficiency of the electrolyte used in this study and that the improvement of the ionic conductivity of electrolyte is also necessary for developing a high-power EDLC.

Authors:
; ;
Publication Date:
Research Org.:
Kyoto Univ. (JP)
OSTI Identifier:
20014482
Resource Type:
Journal Article
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 147; Journal Issue: 1; Other Information: PBD: Jan 2000; Journal ID: ISSN 0013-4651
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; CAPACITIVE ENERGY STORAGE EQUIPMENT; ELECTRODES; CARBON FIBERS; ACTIVATED CARBON; BULK DENSITY; CAPACITANCE; EFFICIENCY; IONIC CONDUCTIVITY

Citation Formats

Nakagawa, Hiroyuki, Shudo, Atsushi, and Miura, Kouichi. High-capacity electric double-layer capacitor with high-density-activated carbon fiber electrodes. United States: N. p., 2000. Web. doi:10.1149/1.1393154.
Nakagawa, Hiroyuki, Shudo, Atsushi, & Miura, Kouichi. High-capacity electric double-layer capacitor with high-density-activated carbon fiber electrodes. United States. https://doi.org/10.1149/1.1393154
Nakagawa, Hiroyuki, Shudo, Atsushi, and Miura, Kouichi. 2000. "High-capacity electric double-layer capacitor with high-density-activated carbon fiber electrodes". United States. https://doi.org/10.1149/1.1393154.
@article{osti_20014482,
title = {High-capacity electric double-layer capacitor with high-density-activated carbon fiber electrodes},
author = {Nakagawa, Hiroyuki and Shudo, Atsushi and Miura, Kouichi},
abstractNote = {Recently the authors have presented a method to prepare activated carbon fiber with high bulk density (HD-ACF) without using any binders. The possibility of using the HD-ACF as an electrode for electric double-layer capacitors (EDLCs) was examined in this paper. The capacitance of the EDLC with the HD-ACF electrode increased with the increase of bulk density of the HD-ACF, indicating that individual fibers are highly packed without losing their capacitance. The capacitance also increased in proportion to the size of the HD-ACF electrode. The initial discharge current of the EDLC showed little dependency on either the bulk density or the size of the HD-ACF electrode. These results clarified that the HD-ACF electrode is suitable for constructing a high-power EDLC. The initial discharge current was directly proportional to the conductivity of aqueous KCI used as the electrolyte, indicating that the resistance of the electrolyte is much higher than that of the HD-ACF electrode. This result showed that the efficiency of the HD-ACF was well above the efficiency of the electrolyte used in this study and that the improvement of the ionic conductivity of electrolyte is also necessary for developing a high-power EDLC.},
doi = {10.1149/1.1393154},
url = {https://www.osti.gov/biblio/20014482}, journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 1,
volume = 147,
place = {United States},
year = {2000},
month = {1}
}