Journal
ELECTROCHIMICA ACTA
Volume 111, Issue -, Pages 608-613Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.08.032
Keywords
Aligned carbon nanotubes; Mechanical densification; Nanomorphology ion pathways control; Supercapacitors; Volumetric electrochemical performance
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Funding
- AFOSR [FA9550-11-1-0192]
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The superior electrical conductivity and parallel ion pathways formed by aligned carbon nanotubes (A-CNTs) make them attractive for the nanoporous electrodes of supercapacitors. To achieve high volumetric energy and power densities, the low volume density of the as-synthesized A-CNT (<5%) should be densified. In this paper, we demonstrate a mechanical densification method that allows the density of A-CNTs to be tuned precisely over a broad range while preserving the straight ion pathway between A-CNTs. The supercapacitors fabricated from 40% volumetric fraction (Vf) of A-CNTs as the electrodes with the thickness of 0.8 mm exhibit a power density of 25 kW L-1 (50 kW kg(-1)), which is much higher than that of the A-CNTs electrodes with similar thickness fabricated by other methods and that of activated carbon electrodes. (C) 2013 Elsevier Ltd. All rights reserved.
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