Improvement of system capacitance via weavable superelastic biscrolled yarn supercapacitors

Changsoon Choi, Kang Min Kim, Keon Jung Kim, Xavier Lepró, Geoffrey M. Spinks, Ray H. Baughman and Seon Jeong Kim ()
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Changsoon Choi: Center for Self-Powered Actuation, Hanyang University
Kang Min Kim: Center for Self-Powered Actuation, Hanyang University
Keon Jung Kim: Center for Self-Powered Actuation, Hanyang University
Xavier Lepró: The Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas
Geoffrey M. Spinks: Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, University of Wollongong
Ray H. Baughman: The Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas
Seon Jeong Kim: Center for Self-Powered Actuation, Hanyang University

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Yarn-based supercapacitors having improved performance are needed for existing and emerging wearable applications. Here, we report weavable carbon nanotube yarn supercapacitors having high performance because of high loadings of rapidly accessible charge storage particles (above 90 wt% MnO2). The yarn electrodes are made by a biscrolling process that traps host MnO2 nanoparticles within the galleries of helically scrolled carbon nanotube sheets, which provide strength and electrical conductivity. Despite the high loading of brittle metal oxide particles, the biscrolled solid-state yarn supercapacitors are flexible and can be made elastically stretchable (up to 30% strain) by over-twisting to produce yarn coiling. The maximum areal capacitance of the yarn electrodes were up to 100 times higher than for previously reported fibres or yarn supercapacitors. Similarly, the energy density of complete, solid-state supercapacitors made from biscrolled yarn electrodes with gel electrolyte coating were significantly higher than for previously reported fibre or yarn supercapacitors.

Date: 2016
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DOI: 10.1038/ncomms13811

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