The effect of crown ether additives for the electrolyte solution containing Mg(N(CF 3 SO 2 ) 2 ) 2 (Mg(TFSA) 2 ) was studied. Mg(TFSA) 2 salt hardly dissolved in tetrahydrofuran, while 1 mol dm −3 solution was obtained by 18-crown-6 (18C6) ether addition and the 10 −3 S cm −1 order of ionic conductivity was achieved. From the FT-IR spectrum, the predominantly coordination between Mg 2+ -ion and 18C6 was indicated. Cyclic voltammogram showed the redox current, which indicated that the reversible

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... Mg plating and stripping reaction took place, while the clear redox current did not appear in the additive-free solution. From the results, we concluded the specific solvation structure of Mg 2+ -ion by 18C6 ether would play the effective role for the reversible Mg plating and stripping reaction.