Highly Flexible and Self‐Healable Zinc‐Ion Hybrid Supercapacitors Based on MWCNTs‐RGO Fibers,Advanced Materials Technologies

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Highly Flexible and Self‐Healable Zinc‐Ion Hybrid Supercapacitors Based on MWCNTs‐RGO Fibers
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-07-29 , DOI: 10.1002/admt.202000268
Tong Ni _{1,

2} , Siliang Wang _{1,

2} , Junjie Shi _{1,

2} , Xiaoyu Du _{1,

2} , Qinghua Cheng _{1,

2} , Ziyan Dong _{1,

2} , Limin Ruan _{1,

2} , Wei Zeng _{1,

2} , Xiaohui Guo _{1,

2} , Xingang Ren _{1,

2} , Zhixiang Huang _{1,

2}

Affiliation

As the flexible wearable devices are developing rapidly, the requirement for energy storage devices with high energy and power density, excellent flexibility, and high reliability is increasing. Fiber‐shaped supercapacitors offering high power density and excellent flexibility have attracted widespread attention. However, the low energy density and poor reliability limit the practical application of these fiber‐shaped supercapacitors. To overcome these problems, a new zinc‐ion hybrid fiber supercapacitor (ZHFSC) is designed and realized. As both capacitor‐type and battery‐type energy storage mechanisms can be used, the energy density of ZHFSC is expected to be improved. Furthermore, the excellent self‐healability of poly(vinyl alcohol) (PVA)/Zn(CF₃SO₃)₂ aqueous gel electrolyte contributes to the high reliability of the ZHFSC. As a proof of concept, the maximum power density and energy density of the ZHFSC are, respectively, as high as 1433.2 mW cm⁻³ and 13.1 mWh cm⁻³, and the capacitance retention, respectively, has the high values of 87.8% and 70.5% under the bending degree of 150° and after the fifth self‐healing. This study offers an efficient method to realize the high‐performance supercapacitors for flexible wearable devices in the future.

中文翻译：

基于MWCNTs-RGO光纤的高度灵活且可自愈的锌离子混合超级电容器

随着柔性可穿戴设备的快速发展，对具有高能量和功率密度，优异的柔性和高可靠性的储能设备的需求正在增加。具有高功率密度和出色柔韧性的纤维状超级电容器引起了广泛的关注。但是，低能量密度和较差的可靠性限制了这些纤维状超级电容器的实际应用。为了克服这些问题，设计并实现了一种新型的锌离子混合纤维超级电容器（ZHFSC）。由于可以同时使用电容器类型和电池类型的能量存储机制，因此ZHFSC的能量密度有望提高。此外，聚乙烯醇（PVA）/ Zn（CF ₃ SO ₃）₂的优异自修复性水性凝胶电解质有助于ZHFSC的高可靠性。作为概念的证明，ZHFSC的最大功率密度和能量密度分别高达1433.2 mW cm ^-3和13.1 mWh cm ^-3，并且电容保持率分别具有87.8％和87.8％的高值。第五次自愈后，在150°弯曲度下为70.5％。这项研究为将来在柔性可穿戴设备中实现高性能超级电容器提供了一种有效的方法。

更新日期：2020-09-10

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