A High Performance Stretchable Asymmetric Fiber-Shaped Supercapacitor with a Core-Sheath Helical Structure

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• 作者：Jiali Yu ; Weibang Lu ; Joseph P. Smith ; Karl S. Booksh ; Linghui Meng ; Yudong Huang ; Qingwen Li ; Joon-Hyung Byun ; Youngseok Oh ; Yushan Yan and Tsu-Wei Chou
• 刊名：Advanced Energy Materials
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：7
• 期：3
• 全文大小：2284K
• ISSN：1614-6840

文摘

The emerging fiber-shaped supercapacitors (FSSs) have motivated tremendous research interest in energy storage devices. However, challenges still exist in the pursuit of combination of excellent electrochemical performance and mechanical stretchability. Here, a core-sheath asymmetric FSS is first made by wrapping gel electrolyte coated carbon nanotube (CNT)@MnO₂ core fiber with CNT@PPy composite film. Then a stretchable helical structure is formed by over-twisting the FSS. The resulted stretchable asymmetric FSS exhibits a specific capacitance of 60.435 mF cm⁻² at the scan rate of 10 mV s⁻¹ and the capacitance performance is well maintained during repeated stretching to 20% strain. Furthermore, a high energy density of 18.88 μW h cm⁻² is achieved for the stretchable FSS due to its high specific capacitance and extended potential window of 1.5 V.