3 years ago

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
Seungki Hong, Ji Hoon Kim, Sangkyu Lee, Jongsu Lee, Dae-Hyeong Kim, Kyungsik Do, Minbaek Lee
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 ≈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. Stretchable electrodes using a laterally combed carbon nanotube (CNT) network are fabricated by restructuring of vertically aligned CNTs through a lateral-combing process. Subsequent Ni-electroplating further enhances the conductivity of the laterally combed CNT network. This novel nanostructure is used as electrically and electrochemically high performance electrodes in wearable energy harvesting (wireless charger and triboelectric generator) and storage (lithium ion battery and supercapacitor) devices.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201704353

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