Journal
ACS APPLIED ELECTRONIC MATERIALS
Volume 2, Issue 3, Pages 659-669Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.9b00769
Keywords
wearable supercapacitors; interweaving; energy density; Raman spectroscopy; electrochemical potential window
Funding
- Department of Science and Technology [DST/TMD/MES/2k17/41]
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Flexible, solid-state energy storage devices with higher operational voltage and large energy density are in increasing demand for powering microelectronic devices on wearable platforms. Addressing this, we demonstrate an all solid-state, mechanically robust electrochemical supercapacitor operating at 3 V with <5% loss in performance over 10 000 charge-discharge cycles. Single-walled carbon nanotube-coated cellulose yarns (CNT-wires) are interwoven through a cellulosic polymer-ionic liquid (ion-gel) electrolyte sheet to create supercapacitive microjunctions that deliver high energy density (similar to 50 Wh kg(-1)) and power density (similar to 4400 W kg(-1)). Three-dimensional ion-transport microchannels that form within the polymeric scaffold are observed by micro-Raman spectro-microscopy and are engineered to achieve low iR(drop) (2.5%), high energy density, and Coulombic efficiency (95% at 3 V). The interwoven microjunctions are further integrated through origami to realize their parallel and series combinations for a wide-ranging performance (50-189 Wh kg(-1)). This combination of operability at 3 V and excellent performance with electrochemical and mechanical durability is used to power a light-emitting diode (LED) and suggests potential applications in portable electronics.
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