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Anions Effect on the Electrical Properties of PMMA/ENR 50 Blend Electrolytes

The lattice energy of the doping salt for a polymer electrolyte is crucial because it affects the ionic conductivity of the polymer electrolyte system. It is also known that the lattice energy of a salt depends on the size of the anion. The larger the anion the lower the lattice energy of the salt. Therefore, in this study the effect of the anion size of various doping salts; LiNO3 and LiN(CF3SO2)2 with lattice energy of 848 kJ/mol and 489.4 kJ/mol, respectively were investigated and compared with LiCF3SO3 salt (735 kJ/mol) on the electrical properties of poly (methyl methacrylate) (PMMA) / epoxidised natural rubber (ENR 50) blend film. All the doped PMMA/ENR 50 films were prepared by solvent casting technique. Surprisingly, though LiN(CF3SO2)2 exhibited the lowest lattice energy, it displayed the lowest ionic conductivity value of 10-8 S/cm at room temperature as compared to LiNO3 and LiBF4 due to its poor coordinating power with the polymer. This was confirmed from the FTIR analyses. Further investigation on the dielectric behaviour of the doped PMMA/ENR 50 films were also reported.