High volumetric electrochemical performance of ultra-high density aligned carbon nanotube supercapacitors with controlled nanomorphology

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• 作者：Yue Zhou ; Mehdi Ghaffari ; Minren Lin ; Ethan M. Parsons ; Yang Liu ; Brian L. Wardle ; Q.M. Zhang
• 关键词：Aligned carbon nanotubes ; Mechanical densification ; Nanomorphology ion pathways control ; Supercapacitors ; Volumetric electrochemical performance
• 刊名：Electrochimica Acta
• 出版年：30 November, 2013
• 年：2013
• 卷：111
• 期：Complete
• 页码：608-613
• 全文大小：1719 K

文摘

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^鈭? (50 kW kg^鈭?), which is much higher than that of the A-CNTs electrodes with similar thickness fabricated by other methods and that of activated carbon electrodes.