Effect of LiAlO2 nanoparticle filler concentration on the electrical properties of PEO–LiClO4 composite

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 × 10−5 ohm−1 cm−1 for sample with a composition of (LiAlO2)1.5(polyethylene oxide)11(LiClO4). All results were correlated and discussed.

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► Structural modification of nano LiAlO2 filler increased conductivity.
► Good ionic conductivity for (LiAlO2)1.5(PEO)11(LiClO4) at room temperature.
► Nano LiAlO2 filler enhanced both ion migration and orientation.
► High dielectric properties for (LiAlO2)1.5(PEO)11(LiClO4) at room temperature.