Electrochemical deposition and dissolution of metallic lithium in various phosphonium ionic liquids with bis(trifluoromethylsulfonyl)imide anion were evaluated by cyclic voltammetry using a Ni electrode. In the voltammograms measured in phosphonium ionic liquids containing 0.8 mol dm − 3 lithium cation, cathodic and anodic peaks attributed to the deposition and dissolution of metallic lithium were observed at approximately − 3.1 V vs Fc ∕ Fc + . It was also found that phosphonium ionic liquids tended to give larger redox responses for the lithium deposition/dissolution than those of the corresponding ammonium ionic liquids.
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Tsunashima et al. (2007) studied this question.
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