The relationship between ionic diffusivity, viscosity, and molar conductivity for different cationic and anionic structures was highlighted by the works of Watanabe et al and coworkers . Through self-diffusion and conductivity experiments, it has been shown that the diffusion of the ionic species in IL was an anion driven process. In those studies, it has been shown that the high rate of ions contributing to the ionic conductivity within the diffusion component was related to the poor interaction of the anion with the cation. Thus, it is evident from these studies that size, shape and geometry of the anion determine the strength of the electrostatic interaction between the cation and the anion. The effect of the salt concentration on the ionic conductivity in different ILs has also been reported for some IL systems. For example, some interesting properties were observed for [EMI][TFSI]/EC/DEC mixtures . In those studies, it has been shown that the ionic conductivity increased when the IL in the mixtures increases from 0 to around 60%, as would be expected if the "salt" (I ) concentration increases by adding it to the conventional solvent EC/EDC. However, further increase above 60% IL in the mixture, the study reported that the conductivity decreased, due the absence of sufficient organic solvent available to "solvate" all the I present, and the conductivity approached that of pure IL. Furthermore, the addition of EC in to IL based electrolyte exhibited a significant increase of ionic conductivity due to the dilution effect of electrolytes, which helped decrease the ion-ion interaction between Li + and TFSI -anion.