No single-solvent electrolyte can satisfy all the requirements of LIB electrolytes. For this reason, therefore, LIB electrolytes are often complex mixtures of multiple co-solvents with optimized properties. Here in, we present the effects of different mixing ratios of the IL solvents, the computed density of the pure IL/1M LiFSI system (no EC/DMC content) is higher than that of the EC/DMC/1M LiFSI system (no [EMI][TFSI] content). The relative increase in density with higher contents of IL/1M LiFSI system is suggestive of arising from the stronger interactions of [TFSI] -and [FSI] -anions with the Li + ions as compared to the interaction of EC/DMC with Li + ions. The behavior of the MSDs for the center-of-mass of the ions as a function of IL/carbonate co-solvent mixtures indicated that the ions exhibited slow dynamics (diffusity) with higher carbonate content. The observed MSD curves show that ions exhibite faster dynamics (diffusity) with higher IL content. Our study on the diffusion coefficient analysis of Li + , [FSI] -and [TFSI] -ions have revealed that the organic solvents restrict the free motion of the ions, reducing the dynamics (diffusity) of the electrolytes. In this work, the Ds values predicted for the ions in the IL/carbonate blends were found to be of the order of 10 -12 m 2 /s. The Li + ions have higher diffusion rates in the [EMI][TFSI]/EC/DMC mixture than all other iomic species present. This finding is in sharp contrast with previously reported studies which indicated that the D s values change in the order D EMI > D TFSI > D Li . In those studies, the Li + ions had the lowest Ds values, and the [EMI] + cations have the highest value.Our finding shows that the diffusion rate of Li + ions changes with the concentration of the EC/DMC co-solvents. Our results also show that the diffusion rate of the [FSI] -anions is higher than [TFSI] -anions. In all cases, the diffusion rates of the cation are higher than those of the anions, which is consistent with experimental data. Our MD simulation results revealed that the total molar ionic conductivity for the different mixing ratios of IL/carbonate blends decrease with higher contents of EC/DMC cosolvents. Our results show that 1M LiFSI doped [EMI][TFSI] Ils have higher total molar ionic conductivity than 1M LiFSI doped pure EC/DMC carbonate solvents. Further more, the relative ionic contribution to the total molar conductivity of each individual cationic and anionic species increase with higher contents of IL in the IL/carbonate mixture, showing that higher carbonate co-solvents have the effects of reducing the molar ionic conductivity. The organic solvents restrict the free motion of the ionic species, resulting in a low conductivity for the organic-based electrolytes, while the IL solvents facilitate the ionic association of the ions, causing a high conductivity for the IL-based electrolytes. Additionally, we realized that the molar ionic conductivity changes in the order ᴧ Li > ᴧ EMI > ᴧ FSI > ᴧ TFSI , indicating that Li + ions have the highest molar ionic conductivity. The numerical value of the ionic conductivity of ILs does not reflect their ability to conduct Li + ions. Lithium transference number (T Li )