Laminate composite-based highly durable and flexible supercapacitors for wearable energy storage
Laminate composite-based highly durable and flexible supercapacitors for wearable energy storage
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DOI：
10.1016/j.est.2020.101460
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发表时间：
2020-06-01
影响因子：
9.4
通讯作者：
Shen, Caiwei
中科院分区：
文献类型：
--
作者：
Anjum, Nasim;Grota, Matthew;Shen, Caiwei
柔性超级电容器是下一代柔性电子产品的有前途的电源，因为与当前的电池相比，它们安全，机械稳定且耐用。然而，迄今为止报道的柔性超级电容器器件尚未表现出足够的机械性能来承受现实应用中的临界变形。在这里，我们介绍了我们的设计和结构的柔性超级电容器使用层压复合材料，以实现卓越的机械性能，包括可折叠性，可扭曲性和机洗性。电极层由聚合物电解质/碳电极（基质/填料）复合材料制成，在其制造过程中同时优化了机械和电化学性能。计算和实验结果表明，适当的电解质基质和纤维基电极填料的体积比导致所需的柔性，强度，以及高的面电容。原型显示出超过40 mF/cm（2）的可调面电容，具有与可穿戴织物相当的厚度和灵活性。电化学性能在反复折叠和扭转测试后保持不变。此外，缝合到可穿戴织物上的原型设备在机洗后显示出不可检测的机械损伤或电容退化。
Flexible supercapacitors are promising power sources for next-generation flexible electronics because they are safe, mechanically stable and durable compared with current batteries. However, flexible supercapacitor devices reported so far have not demonstrated adequate mechanical properties to withstand critical deformations for real-world applications. Here we present our design and construction of flexible supercapacitors using laminate composites to achieve exceptional mechanical properties, including foldability, twistability, and machine washability. The electrode layer is made of a polymer electrolyte/carbon electrode (matrix/filler) composite, with mechanical and electrochemical performance optimized simultaneously in its making. Calculations and experimental results show that proper volume ratio of the electrolyte matrix and fiber-based electrode fillers leads to desired flexibility, strength, as well as high areal capacitance. The prototypes show adjustable areal capacitances of over 40 mF/cm(2) with comparable thickness and flexibility to wearable fabrics. The electrochemical performance has remained unchanged after repeated folding and twisting tests. Moreover, a prototype device sewed onto a wearable fabric show non-detectable mechanical damage or capacitance degradation after machine washing.