1. Department of Applied Chemistry, Graduate School of Science and Engineering, Yamaguchi University, 1-2-16 Tokiwadai, Ube 755-8611, Japan;2. CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi 322-0012, Japan
Abstract:
A series of imidazolium cation-based ionic liquids (ILs) have been synthesized and examined as ionic solvents for rechargeable magnesium batteries. The electrolyte solutions consist of these ILs dissolving methylmagnesium bromide with tetrahydrofuran (MeMgBr/THF). The chemical structure of imidazolium cation much influenced the ionic conductivity and the electrochemical window of the system. A reversible process of cathodic deposition and anodic dissolution of magnesium has been successfully achieved at room temperature. The highest value of anodic peak current for magnesium dissolution was obtained in an optimized-structure IL with allyl and methoxyethyl groups as the substituents.