The effect of ILs as co-salts in electrolytes for high voltage supercapacitors

Ha Na Kwon, Su Jin Jang, Yun Chan Kang, Kwang Chul Roh

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24 Citations (Scopus)


Ionic liquids (ILs) which have electrical stability are attractive materials to enhance the potential window of electrolyte. According to the potential window is extended, available voltage for supercapacitor is broaden. In this study, the addition of ILs which is 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) and 1-ethyl-3-methylimidazolium bis(trifluoromethylesulfonyl) imide (EMITFSI) as co-salts, to a supercapacitor electrolyte increases the ionic conductivity and stability of it due to inhibition of electrolyte decomposition. As a result, the electrochemical stability potential windows (ESPWs) of supercapacitor is improved and the supercapacitor exhibited increased cycling stability. The loss of specific capacitance upon addition of 7 wt% EMIBF4 or EMITFSI to the electrolyte was 2.5% and 8.7%, respectively, after 10,000 cycles at 3.5 V, compared to the specific capacitance of the initial discharge.

Original languageEnglish
Article number1180
JournalScientific reports
Issue number1
Publication statusPublished - 2019 Dec 1

Bibliographical note

Funding Information:
This work was supported by the Energy Efficiency and Resources program of the Korea Institute of Energy Technology Evaluation Planning (KETEP), and was granted financial resources from the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20172410100150). This work was supported by a grant from the Fundamental R&D program and funded by the Korea Institute of Ceramic Engineering and Technology (KICET) and Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea.

Publisher Copyright:
© 2019, The Author(s).

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