Stretchable wire-shaped supercapacitors with high energy density for size-adjustable wearable electronics
Stretchable wire-shaped supercapacitors with high energy density for size-adjustable wearable electronics
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DOI：
10.1016/j.cej.2017.04.065
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发表时间：
2017-08
影响因子：
15.1
通讯作者：
Minjie Shi;Cheng Yang;Xuefeng Song;Jing Liu;Liping Zhao;Peng Zhang;Lian Gao
中科院分区：
文献类型：
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作者：
Minjie Shi;Cheng Yang;Xuefeng Song;Jing Liu;Liping Zhao;Peng Zhang;Lian Gao
线状超级电容器（WSSC）对于下一代可穿戴电子产品具有相当大的兴趣。然而，基于非弹性纱线电极的WSSC的拉伸性差，严重导致了器件尺寸可调节性的不足。本文提出了一种新型的高导电性、柔性和弹性的纱线电极，该电极通过在镀银双包层纱线（Ag-DCY）上包覆电活性碳纳米管（CNTs）网络来实现。一方面，具有“缠绕弹簧”结构的高导电性Ag-DCY充当电极的弹性基底。另一方面，薄的碳纳米管层均匀地包裹在整个纱线上，这为电极提供了显着的电化学电容。基于纱线电极的WSSC具有体积能量密度高（4.17 mWh/cm ~ 3）、体积功率密度高（1080 mW/cm ~ 3）、耐久性好等优点，是一种高效的储能器件。更重要的是，集成器件是随机可弯曲和可拉伸的，而不会降低电化学性能。这种上级储能性能和在高应变（最大150%）下稳定的电化学行为几乎是以前从未报道过的。因此，WSSC可以很容易地与纺织品编织成不同的形状，这清楚地代表了可用的自拉伸和尺寸可调的能力，从而为可穿戴电子产品的发展开辟了新的途径。
Wire-shaped supercapacitors (WSSCs) are of considerable interest for next-generation wearable electronics. However, the poor stretchability of WSSCs based on inelastic yarn electrode seriously lead to the deficient size-adjustability of the devices. Herein, a novel kind of highly conductive, flexible and elastic yarn electrode has been put forward, which is realized by coating electro-active carbon nanotubes (CNTs) network onto the Ag-plated double-covered yarns (Ag-DCYs). On the one hand, highly conductive Ag-DCYs with “twining spring” architecture serve as the elastic substrate of the electrode. On the other hand, thin CNTs layer is uniformly wrapped on the whole yarns, which provides remarkable electrochemical capacitance for the electrode. Benefiting from the intriguing configuration, WSSCs based on the yarn electrode act as the efficient energy storage devices, which exhibit high volumetric energy density (4.17 mWh/cm3), volumetric power density (1080 mW/cm3), strong durability. More importantly, the integrated devices are randomly bendable and stretchable without the degradation of electrochemical performance. Such superior energy storage performance and steady electrochemical behaviors under high strain (150% maximum) have almost never been reported before. As a result, the WSSCs can be readily knitted with textiles and woven into different shapes, which distinctly represent the available self-stretchable and size-adjustable ability, thereby throwing light on a new avenue for the development of wearable electronics.