Stretchable Wire-Shaped Asymmetric Supercapacitors Based on Pristine and MnO2 Coated Carbon Nanotube Fibers

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• 作者：Ping Xu ; Bingqing Wei ; Zeyuan Cao ; Jie Zheng ; Ke Gong ; Faxue Li ; Jianyong Yu ; Qingwen Li ; Weibang Lu ; Joon-Hyung Byun ; Byung-Sun Kim ; Yushan Yan ; Tsu-Wei Chou
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：9
• 期：6
• 页码：6088-6096
• 全文大小：670K
• ISSN：1936-086X

文摘

While the emerging wire-shaped supercapacitors (WSS) have been demonstrated as promising energy storage devices to be implemented in smart textiles, challenges in achieving the combination of both high mechanical stretchability and excellent electrochemical performance still exist. Here, an asymmetric configuration is applied to the WSS, extending the potential window from 0.8 to 1.5 V, achieving tripled energy density and doubled power density compared to its asymmetric counterpart while accomplishing stretchability of up to 100% through the prestrainning-then-buckling approach. The stretchable asymmetric WSS constituted of MnO₂/CNT hybrid fiber positive electrode, aerogel CNT fiber negative electrode and KOH-PVA electrolyte possesses a high specific capacitance of around 157.53 渭F cm^鈥? at 50 mV s^鈥? and a high energy density varying from 17.26 to 46.59 nWh cm^鈥? with the corresponding power density changing from 7.63 to 61.55 渭W cm^鈥?. Remarkably, a cyclic tensile strain of up to 100% exerts negligible effects on the electrochemical performance of the stretchable asymmetric WSS. Moreover, after 10鈥?00 galvanostatic charge鈥揹ischarge cycles, the specific capacitance retains over 99%, demonstrating a long cyclic stability.