Magnesium-based rechargeable batteries might be an interesting future alternative to lithium-based batteries
since magnesium compounds are highly abundant in the earth and are environmental friendly. In
this work, we have prepared polymethylmethacrylate (PMMA) based gel polymer electrolyte (GPE) films
containing two different magnesium salts, which is magnesium triflate, Mg(CF3SO3)2 and magnesium
perchlorate, Mg(ClO4)2 using solution casting technique. The ionic conductivity of both gel polymer electrolyte
systems was evaluated using a.c impedance spectroscopy. Results show that at room temperature,
GPE-Mg(CF3SO3)2 system exhibits the highest conductivity value at 1.27 × 10−3 S cm−1 for the film containing
20 wt.% of Mg(CF3SO3)2 salt, while the highest conductivity value for the GPE-Mg(ClO4)2 system
is 3.13 × 10−3 S cm−1 for the film containing 15 wt.% of Mg(ClO4)2 salt. The conductivity-temperature
studies of both GPE systems follow the Arrhenius behavior. The activation energies for ionic conduction
were determined to be in the range of 0.18–0.26 eV. The transport numbers of magnesium ions in both
GPE systems were evaluated using the combination of a.c impedance spectroscopy and d.c polarization
techniques. The results obtained indicate that the charge carriers in the GPE films for both systems are
predominantly due to ions.
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