화학공학소재연구정보센터
Journal of Power Sources, Vol.360, 41-47, 2017
High performance spiro ammonium electrolyte for Electric Double Layer Capacitors
The smallest spiro ammonium salt reported to date, 1 M 4-Axoniaspiro[3,4]octane tetrafluoroborate (APBF(4)), was successfully synthesized and investigated as the electrolyte with acetonitrile (AN) in an Electric Double Layer Capacitor (EDLC) for the first time. The electrochemical characteristics of EDLC devices containing 1 M APBF(4)/AN paired with commercial activated carbon electrodes were compared to devices containing popular EDLC electrolytes, 1 M 5-Azoniaspiro[4.4]nonane tetrafluoroborate (SBPBF4/AN) and 1 M tetraethyl ammonium tetrafluoroborate (TEABF(4)/AN), using cyclic voltammetry (CV), gal-vanostatic charge discharge (GCD), and electrochemical impedance spectroscopy (EIS). The average gravimetric capacitance of the 1 M APBF4 device (124.7 F g(-1)) was found to be greater than the values measured for both the 1 M SBPBF4 device (108.6 F g(-1)) and the 1 M TEABF(4) device (992 F g(-1)). The direct current equivalent series resistance (ESR) of the 1 M APBF(4) device (383.4 m Omega cm(-2)) was found to be substantially lower than the values measured for both the 1 M SBPBF4 device (501.0 m Omega cm(-2)) and the 1 M TEABF4 device (710.8 m Omega cm(-2)). These results demonstrate that APBF(4), when compared to current commercial electrolytes, significantly enhances the energy storage properties of EDLC devices. (C) 2017 Elsevier B.V. All rights reserved.