Nano-composite polymer electrolytes are receiving attention as potential candidates to be used as
electrolyte membranes in lithium polymer batteries and other devices. In this work, polyethylene oxide–
LiClO4 based composite polymer electrolyte was prepared by solution casting method. The effect of
LiAlO2 nanoparticle ceramic filler concentration on the structure and electrical conduction of the
composite was studied. Nano-LiAlO2 was synthesized by sol–gel method. The samples were
characterized using X-ray diffraction, Fourier Transmission-Infra Red, Differential Scanning Calorimetry,
and tested by dielectric properties, Direct and Alternating current measurements as well as by
impedance spectroscopy. All samples showed a behavior referring to an ionic conduction. Generally, the
melting temperature of the polymer electrolyte decreased with filler concentration. Both thermal
property and filler concentration influenced conductivity value. At room temperature, the highest ionic
conductivity was 9.76  105 ohm1 cm1 for sample with a composition of (LiAlO2)1.5(polyethylene
oxide)11(LiClO4). All results were correlated and discussed.