Abstract
A binary ionic liquid (IL) system based on a common organic cation, N, N-diethyl- N-methyl- N-(2-methoxyethyl)anmmonium (DEME +), with mixed anion of bis(trifluoromethanesulfonyl)imide (TFSI −) and bis(fluorosulfonyl)imide (FSI −) has been examined as a supporting electrolyte of rechargeable magnesium batteries. Basic properties of the mixed IL were measured as a function of the mixing ratio, n, in the composition of [DEME +][TFSI −] n [FSI −] 1− n . Electrochemical deposition/dissolution behavior of magnesium was investigated in the mixed IL containing an organo-magnesium complex, methyl magnesium bromide with tetrahydrofuran (MeMgBr/THF). Viscosity and ionic conductivity of the mixed IL showed monotonous changes with the mixing ratio, while their thermal properties proved discontinuous changes with the compositions. Coulombic (current) efficiency of 90% or higher was obtained for cathodic deposition of magnesium in the mixed IL containing MeMgBr/THF. The current density for cathodic deposition and anodic dissolution depended on the IL composition, and the maximum value was obtained at the composition of n = 0.5.
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