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Ionic Conductivity and Discharge Studies of PVP-MgSO4.7H2O Polymer Electrolyte for Solid State Battery Applications

Sk. Shahenoor Basha, G. Sunita Sundari and K. Vijaya Kumar

Ionic conducting solid polymer electrolyte films has been prepared with PVP (poly vinyl pyrrolidone) and it is complexed with magnesium sulphate heptahydrate (MgSO47H2O) by solution casting technique. Different experimental techniques such as FTIR and UV-visible, were used to characterize these polymer electrolytes and electrical, ionic properties of these films were studied by DC conductivity, weight composition, and transport and discharge characteristics. Conductivity measured at the temperature range 303 K to 373 K and it is found that the ionic conductivity of PVP polymer electrolyte is about 7.04 x 10-8S/cm at room temperature, the highest conductivity is found to be 1.75 x 10-5 S/cm at 373K, for sample with 15% of MgSO4.7H2O in PVP polymer. The transference number data reveals that the dominance of ions and charge carriers takes place in this polymer electrolyte system. An electrochemical cells has been fabricated with the configuration of Mg+/(PVP + MgSO4.7H2O)/(I2 + C + electrolyte) and discharge characteristics were studied under the constant load of 100k Ω. Various cell parameters such as open circuit voltage (OCV), short circuit current (SCC), energy density, and power density has been calculated.