The limited safety of the present day lithium ion battery (LIB) technology represents the major drawbacks of commercially available LIBs. Current commercial LIBs use electrolytes based on organic carbonates which pose serious safety concerns and strongly reduce the battery operative temperature range . For these reasons, there has been considerable research interest to either partially and/or totally replace the organic solvents (in the electrolytes) with a new type of fluid materials, acting as poorly flammable and/or flame retardant components, called ionic liquids (ILs) . ILs instead of organic carbonates, appear to be promising electrolytes for LIBs because they generally have negligible vapour pressure, high chemical and thermal stability . Among the different ILs used, those based on the anion bis(trifluoromethanesulfonyl)imide (TFSI) have been very popular because of their high thermal and electrochemical stabilities . For example, the decomposition temperature of l-butyl-3-methylimidazolium bis-(trifluromethanesulflonyl)imide ([C 4 mim][TFSI]) has been reported to be 450℃, which is much more thermally stable than carbonate based solvents . However, ILs involving the