Interwoven carbon nanotube wires for high performing, mechanically robust, washable and wearable supercapacitors.
ACS applied materials & interfaces(2019)
摘要
Energy storage system with large storage capacity, rapid power release and simultaneous tolerance to harsh mechanical stresses, is a major bottleneck for realizing self-sustaining, wearable electronics. Addressing this, we demonstrate carbon nanotube-wire (CNT-wire) interwoven solid-state supercapacitive energy storage devices (sewcaps) exhibiting superior storage capacity (30 Wh/kg, compared to electrochemical capacitors ~10 Wh/kg) and fourteen-fold higher power density (3500 W/kg), compared to Li-ion batteries (~250 W/kg). While the high specific surface area, electrical conductivity of CNT-wires and high ionic conductivity of the electrolyte enable high energy density, the device design enables the combination of planar and radial diffusive pathways for ultra-low interface resistance (~0.2 mΩ per sewcap) and rapid charging-discharging ability (τ=1.16 ms). Thus, this versatile approach of interweaving to form functional devices provides tunable power delivery across six orders of magnitude (2 µW-2 W) through reconfiguration of the interweaving pattern and density. Importantly, such textile-integrated sewcaps exhibit unaltered performance (>95% retention across 4000 charge-discharge cycles) under extreme mechanical punishments such as repeated laundering, flexing (~68°), rolling (360°) and crushing (~21.8 kPa) implying direct interfacing with wearable platforms.
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关键词
wearable supercapacitor,energy density,power density,washable,carbon nanotube wire,interweaving
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