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http://dx.doi.org/10.5229/JKES.2017.20.2.34

High Voltage Performance of the Electrical Double Layer Capacitor with Various Electrolytes  

Kim, Jung Wook (Department of Chemical Engineering, Dong-A University)
Choi, Seung-Hyun (Department of Chemical Engineering, Dong-A University)
Kim, Jeom-Soo (Department of Chemical Engineering, Dong-A University)
Publication Information
Journal of the Korean Electrochemical Society / v.20, no.2, 2017 , pp. 34-40 More about this Journal
Abstract
Electric double layer capacitors (EDLC: electric double layer capacitors) have drew attention as an energy storage device for the next generation because of their outstanding power capability and durability. But their usage is somewhat limited due to low energy density over secondary batteries. One of methods to improve the energy of EDLC is expanding the voltage window of cell operation by increasing the charge cut-off voltage. In this study, $SBP-BF_4$ (spirobipyrrolidinium tetrafluoroborate), $TEA-BF_4$ (tetraethylammonium tetraflouroborate) and $EMI-BF_4$ (1-ethyl-3-methylimidazolium tetrafluoroborate) in AN (acetonitrile) were selected to evaluate the possibility of application at high voltage environment. The LSV (linear sweep voltammetry) measurements showed that the 1.5M SBP-BF4/AN electrolyte was stable over a wide potential window and showed the best electrochemical performance compared to other combinations of electrolytes at high voltage environments (over 3.0 V). Furthermore, TMSP (tris(trimethylsilyl) phosphite) was applied to 1.5M SBP-BF4/AN in order to maintain stable performance at high voltage for the long period of time. The electrolyte with TMSP additive showed the capacity retention of 93% after 10,000 cycles at 3.3 V.
Keywords
EDLC; High voltage; Energy; $SBP-BF_4$; TMSP;
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