Stretchable Electrode Based on Laterally Combed Carbon Nanotubes for Wearable Energy Harvesting and Storage Devices
Stretchable Electrode Based on Laterally Combed Carbon Nanotubes for Wearable Energy Harvesting and Storage Devices
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DOI：
10.1002/adfm.201704353
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发表时间：
2017-12-22
影响因子：
19
通讯作者：
Kim, Dae-Hyeong
中科院分区：
文献类型：
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作者：
Hong, Seungki;Lee, Jongsu;Kim, Dae-Hyeong
碳纳米管（CNT）由于其导电性、柔软的机械性能、电化学活性和大的表面积而被用作可穿戴能源设备中的柔性电极的有前途的材料。然而，它们的电阻高于金属的电阻，并且诸如拉伸的变形会导致电性能的劣化。为了解决这些问题，这里提出了一种基于横向梳状CNT网络的新型可拉伸电极。梳状CNT之间增加的渗透提供了高导电性，即使在机械变形下。额外的镍电镀和蛇形电极设计进一步提高了导电性和变形性。所得的可拉伸电极表现出优异的薄层电阻，其与常规金属膜电极相当。即使拉伸到接近100%，电阻变化也是最小的。除了CNT的固有电化学活性性质之外，这种高导电性和可变形性使得能够实现高性能可拉伸能量收集（无线充电线圈和摩擦发电机）和存储（锂离子电池和超级电容器）装置。这些器件的单片集成形成了可穿戴能源供应系统，成功地展示了其作为可穿戴电子产品的新型软电源模块的潜力。
Carbon nanotubes (CNTs) are a promising material for use as a flexible electrode in wearable energy devices due to their electrical conductivity, soft mechanical properties, electrochemical activity, and large surface area. However, their electrical resistance is higher than that of metals, and deformations such as stretching can lead to deterioration of electrical performances. To address these issues, here a novel stretchable electrode based on laterally combed CNT networks is presented. The increased percolation between combed CNTs provides a high electrical conductivity even under mechanical deformations. Additional nickel electroplating and serpentine electrode designs increase conductivity and deformability further. The resulting stretchable electrode exhibits an excellent sheet resistance, which is comparable to conventional metal film electrodes. The resistance change is minimal even when stretched by approximate to 100%. Such high conductivity and deformability in addition to intrinsic electrochemically active property of CNTs enable high performance stretchable energy harvesting (wireless charging coil and triboelectric generator) and storage (lithium ion battery and supercapacitor) devices. Monolithic integration of these devices forms a wearable energy supply system, successfully demonstrating its potential as a novel soft power supply module for wearable electronics.