Ionic Conductivity and Electrochemical Studies of Mg 2+ -Ion Conducting PEG- Al 2 O 3 Composite Polymer Electrolytes

ABSTRACT Composite polymer electrolyte materials are very attractive for components of batteries and optoelectronic devices. PEG-Mg(NO 3 ) 2 polymer electrolytes and their composites were prepared by using addition of different wt. % of Al 2 O 3 ceramic fillers. Several experimental techniques, such as composition-dependence conductivity, temperature dependence conductivity in the temperature range of 303-333 K and transport number measurements, have been employed to characterize these polymer electrolytes. The magnitude of conductivity increased with increase in the concentration of the Al 2 O 3 ceramic filler and temperature. The highest ionic conductivity achieved was 3.4 x 10 -5 S/cm for the sample prepared with 15 wt % of Al 2 O 3 at room temperature. The charge transport in the present composite polymer electrolytes is mainly due to ions. Using these (PEG-Mg(NO 3 ) 2 ) polymer electrolyte and (PEG-Mg(NO 3 ) 2 -Al 2 O 3 ) composite polymer electrolyte, solid-state electrochemical cells were fabricated and their discharge profiles were studied