The addition of 1-butylpyrrolidine to AlCl 3 results in the formation of an electrolyte that is suited to Al deposition. The feasibility of electrodepositing Al from the synthesized electrolyte was investigated. Several compositions of AlCl 3 and 1-butylpyrrolidine were prepared for this purpose. These mixtures show a different phase behavior at various compositions of AlCl 3 and 1-butylpyrrolidine. IR, Raman and NMR spectroscopy were employed to characterize the synthesized liquids. Among the prepared compositions, 1:1.2 mol ratio of 1-butylpyrrolidine: AlCl 3 and the upper phase of 1:1.3 mol ratio of 1-butylpyrrolidine:AlCl 3 were found to be suitable for Al electrodeposition at room temperature (RT). Uniform and thick ( $mm thick) layers of Al were obtained on copper at RT. Al deposition occured from the cationic species of AlCl 3 À x L þ y (where x r2, y ¼ 1-2, and L¼1-butylpyrrolidine) in this electrolyte. This behavior is contrary to the well investigated classic AlCl 3 based ionic liquids, where the deposition of Al occurs mainly from anionic Al 2 Cl À 7 ions.