Although mixtures of linear carbonates and cyclic carbonates provide a serviceable solution to some extent, the most viable strategy, however, is to make use of electrolytes based on mixtures of ionic liquids (ILs) and organic electrolytes . ILs generally have negligible vapour pressure, high chemical and thermal stability . Nevertheless, the potential application of IL electrolytes for LIBs has been overshadowed by their high viscosity which induces low wettability of the electrode surface and low ionic conductivity . In the mixed electrolyte strategy, therefore, finding an optimal ratio of electrolytic components has always been of special interest to improve the performance of LIBs. An appropriate selection of the type of ILs, solvent(s) and lithium salt, as well as the ratio between these components, makes possible the realization of electrolytes with optimized properties. For these reasons, the use of IL/carbonate mixtures as LIB electrolytes has become the research interest of many authors. For example, Guerfi et al. obtained an optimum range of conductivity and viscosity for electrolytes containing 30-40% of ILs in organic solvents containing 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide [TFSI], ethylene carbonate (EC), diethyl carbonate (DEC) and LiPF 6 as lithium salt. Interestingly, the electrochemical performance containing these mixtures has been found to be comparable to that of conventional systems, but with an extra advantage of improved safety. In another study by , the use of [TFSI] ILs in combination with propylene carbonate (PC) showed enhanced electrochemical features for use in LIBs . reported a detailed study about the influence of the amount of ILs on the viscosity, conductivity and flammability of mixtures containing [TFSI], EC, DEC, LiTFSI and LiPF 6 lithium salts . Furthermore, mixtures containing N-alkyl-N-methylpyrolidinium bis(trifluoromethanesulfonyl) imide [TFSI], PC and LiTFSI have also been shown to have had enhanced conductivities, low viscosities, and overall stability windows of more than 5 V. A mixture containing 80 wt% ILs (flash point of 153°C) was found to be nonflammable with the extra advantage of reducing the kinetics of PC evaporation as well as the anodic dissolution of aluminum . The [TFSI] -anion forms hydrolytically stable ionic liquids with high electrical conductivity . Previous studies revealed that [TFSI] salt gives ionic liquid at room temperature. Since then, the [TFSI] -anion has been of great interest for many researchers . The use of [TFSI] with relatively high ionic conductivity of 1.06×10 -2 S•cm -1 and low viscosity at room temperature has already been reported for Li-ion cell . Equimolar mixtures of EC and DMC (50/50 wt%) revealed better ionic conductivity (10.7 mS cm -1 ) at room temperature compared to similar blends with LiTFSI (9.4 mS cm -1 ) . Therefore, it appears useful in our study to critically compare the impact of adding [EMI][TFSI]/EC/DMC using 1 M LiTFSI conducting salt on the achievable molecular interactions of IL/carbonate mixture.