Abstract
AbstractThe effect of Li+ concentration on the electrochemical reactions of Li metal and graphite electrodes was studied in aprotic ionic liquid (P13TFSA: N‐methyl‐N‐propylpyrrolidinium bis(trifluoromethanesulfonyl)amide)‐LiTFSA mixtures. The electrode potential of the Li metal was governed not only by the activity of the complex Li+ ions ([Li(TFSA)2]−), but also by the free‐TFSA− anions, because the desolvation step of the complex Li+ ions needed to be considered. With increasing LiTFSA concentration, the electrode potential of the Li metal increased due to increasing [Li(TFSA)2]− activity and decreasing free‐TFSA− activity in the electrolyte solutions, which was supported by Raman spectroscopy results. The Li+ intercalation reaction into the graphite electrode was also investigated. With increasing LiTFSA concentration, the onium cation (P13+) intercalation, which is a well‐known side reaction without a desolvation step, was suppressed and reversible Li+ intercalation into the graphite electrode was observed.
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