High temperature carbon–carbon supercapacitor using ionic liquid as electrolyte

• Published in: Journal of power sources 2007-03, Vol.165 (2), p.922-927
• Main Authors: Balducci, A., Dugas, R., Taberna, P.L., Simon, P., Plée, D., Mastragostino, M., Passerini, S.
• Format: Article
• Language: English
• Subjects: Activated carbon; Applied sciences; Capacitors. Resistors. Filters; Chemical Sciences; Electrical engineering. Electrical power engineering; Exact sciences and technology; Ionic liquids; Material chemistry; Microporous carbon; Supercapacitor; Various equipment and components
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2006.12.048

This paper presents results about the electrochemical and cycling characterizations of a supercapacitor cell using a microporous activated carbon as the active material and N-butyl- N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR 14TFSI) ionic liquid as the electrolyte. The microporous activated carbon exhibited a specific capacitance of 60 F g −1 measured from the three-electrode cyclic voltammetry experiments at 20 mV s −1 scan rate, with a maximum operating potential range of 4.5 V at 60 °C. A coin cell assembled with this microporous activated carbon and PYR 14TFSI as the electrolyte was cycled for 40,000 cycles without any change of cell resistance (9 Ω cm 2), at a voltage up to 3.5 V at 60 °C, demonstrating a high cycling stability as well as a high stable specific capacitance in this ionic liquid electrolyte. These high performances make now this type of supercapacitor suitable for high temperature applications (≥60 °C).