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Highly Conductive Hierarchical C/C Composites to Eliminate Conductive Agent in EDLC Electrodes
Author(s) -
Chang Panpan,
Wang Chengyang,
Kinumoto Taro,
Tsumura Tomoki,
Chen Mingming,
Toyoda Masahiro
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700650
Subject(s) - materials science , electrolyte , electrode , conductivity , capacitance , electrical conductor , composite material , gravimetric analysis , electrical resistivity and conductivity , carbon black , capacitor , porosity , voltage , electrical engineering , chemistry , natural rubber , organic chemistry , engineering
Nowadays, when fabricating electric double‐layer capacitor (EDLC) electrodes, 10–20 % conductive carbon black (CB) is indispensable to guarantee a satisfactory power output of the whole EDLC. Herein, we constructed a series of porous frame‐filling C/C composites with ample specific surface area (SSA) and adequate electrical conductivity ( e ‐conductivity), aiming at CB‐free EDLC electrodes. The content of the frame and KOH dosage were well‐optimized to balance the SSA and e ‐conductivity. An optimized sample, named F310 exhibits an abundant SSA of 2562 m 2 g −1 , a high sp 2 ‐bonding carbon content of 88.2 %, and sufficient e ‐conductivity of 120 S m −1 . Even totally free of any CB, the resultant EDLC electrode achieved a high gravimetric capacitance of 130.4 F g −1 at 50 mA g −1 with a rate capacity C 10/0.05 of 56.8 % in TEABF 4 /PC electrolyte. Significantly, it could also run independently up to 10,000 cycles at 1 A g −1 with a capacitance retention of 78.3 % in TEABF 4 /PC electrolyte. More importantly, when the CB‐free electrode is in use, the lifespan at a stable high‐rate output is clearly decided by the e ‐conductivity rather than the mesoporous channels.