Abstract
State-of-the-art solid-state flexible supercapacitors with sufficiently fast response speed for AC line filtering application suffer from limited energy density. One of the main causes of the low energy density is the low cell voltage (1 V), which is limited by aqueous-solution-based gel electrolytes. In this work, we demonstrate for the first time a 3-V flexible supercapacitor for AC line filtering based on an ionic-liquid-based polymer gel electrolyte and carbon nanotube electrode material. The flexible supercapacitor exhibits an areal energy density that is more than 20 times higher than that of the previously demonstrated 1-V flexible supercapacitor (0.66 vs 0.03 μWh/cm2) while maintaining excellent capacitive behavior at 120 Hz. The supercapacitor shows a maximum areal power density of 1.5 W/cm2 and a time constant of 1 ms. The improvement of the cell voltage while maintaining the fast-response capability greatly improves the potential of supercapacitors for high-frequency applications in wearable and/or portable electronics.
Original language | English |
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Pages (from-to) | 13909-13917 |
Number of pages | 9 |
Journal | ACS Applied Materials and Interfaces |
Volume | 8 |
Issue number | 22 |
DOIs | |
Publication status | Published - 2016 Jun 8 |
Bibliographical note
Funding Information:This work was supported by a National Research Foundation of Korea (NRF) grant that was funded by the Korean government (NRF-2012R1A2A2A01046950).
Publisher Copyright:
© 2016 American Chemical Society.
Keywords
- AC line filter
- carbon nanotube
- flexible supercapacitor
- ion gel
- power performance
ASJC Scopus subject areas
- General Materials Science