The electrochemical behavior of room temperature ionic liquids (RTILs) based on perfluoroethyltrifluoroborate ([C2F5BF 3]-) was investigated with and without Li[BF4]. The plating-stripping corresponding to the peak of lithium could be observed on a nickel electrode in the RTIL based on a quaternary ammonium cation. However, the addition of ca. 0.4 mol dm-3 of Li[BF4] had almost no effect on the cathodic limit potential of EMI[C2F5BF 3]. The results of electrochemical quartz crystal microbalance (EQCM) measurements in propylene carbonate solution containing ca. 2.0 mol dm -3 of RTILs and 20 mmol dm-3 of LiBF4 indicate that a solid-electrolyte interface formation, which inhibits the reductive decomposition of the EMI cation, was not significant in EMI[C2F 5BF3] with the addition of Li[BF4].
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