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Basic characteristics of electric double layer capacitor mixing ketjen black as conductive filler
Author(s) -
Tashima Daisuke,
Kurosawatsu Kenji,
Taniguchi Mitsufumi,
Uota Masafumi,
Otsubo Masahisa
Publication year - 2008
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20772
Subject(s) - carbon black , capacitance , materials science , analytical chemistry (journal) , electrode , chemical engineering , composite material , chemistry , environmental chemistry , engineering , natural rubber
In this study, ketjen black was used for polarized electrodes instead of conventionally employed acetylene black in order to improve the capacitance of an activated carbon‐based electric double layer capacitor (EDLC). Usually, ketjen black exhibits higher electronic conductivity compared to acetylene black, so that ketjen black could be considered as a conducting fiber. Moreover, N 2 absorption‐desorption isotherm as well as TEM observation revealed that ketjen black used in this study has different types of pore structures compared to acetylene black. The capacitances of prepared EDLC were evaluated from discharge characteristics. It was found that the ketjen black containing EDLC showed fairly high capacitance compared to the one with acetylene black. In particular, an EDLC with 8 wt% ketjen black showed the highest capacitance among prepared samples. The specific capacitance of the best one was evaluated as 59.2 F/g. It was also found that the EDLC with 8 wt% ketjen black exhibited fairly stable capacitance at elevated temperatures based on the temperature dependence for capacitance in an EDLC with 10 wt% acetylene black and one with 8 wt% ketjen black. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 165(1): 1– 8, 2008; Published online in Wiley InterScience ( www.interscience. wiley.com ). DOI 10.1002/eej.20772