A stretchable, asymmetric, coaxial fiber-shaped supercapacitor for wearable electronics

Fiber-shaped supercapacitors (FSCs), owing to their high-power density and feasibility to be integrated into woven clothes, have drawn tremendous attentions as a key device for flexible energy storage. However, how to store more energy while withstanding various types of mechanical deformation is st...

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Veröffentlicht in:Nano research 2020-06, Vol.13 (6), p.1686-1692
Hauptverfasser: Yuan, Hua, Wang, Guang, Zhao, Yuxing, Liu, Yang, Wu, Yang, Zhang, Yuegang
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Sprache:eng
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Zusammenfassung:Fiber-shaped supercapacitors (FSCs), owing to their high-power density and feasibility to be integrated into woven clothes, have drawn tremendous attentions as a key device for flexible energy storage. However, how to store more energy while withstanding various types of mechanical deformation is still a challenge for FSCs. Here, based on a magnetron sputtering method, different pseudocapacitive materials are conformally coated on self-supported carbon nanotube aligned films. This fabrication approach enables a stretchable, asymmetric, coaxial fiber-shaped supercapacitors with high performance. The asymmetric electrode configuration that consists of CNT@NiO@MnO x cathode and CNT@Fe 2 O 3 anode successfully extends the FSC’s electrochemical window to 1.8 V in an aqueous electrolyte. As a result, a high specific capacitance of 10.4 F·cm −3 is achieved at a current density of 30 mA·cm −3 corresponding to a high energy density of 4.7 mWh·cm −3 . The mechanical stability of the stretchable FSC is demonstrated with a sustainable performance under strains up to 75% and a capacitance retention of 95% after 2,000 cycles under 75% strain.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-020-2793-x