Gel polymer composites electrolytes containing nano LiAlO2 as filler were prepared using a solution cast
technique and characterized using different techniques such as X-ray diffraction (XRD), thermal analysis
(TG, DSC), Fourier transform infra e red spectroscopy (FT-IR) and scanning electron microscope (SEM). Xray
diffraction analysis showed the effect of lithium tri fluoro methane sulphonate (LiCF3SO3), poly vinyl
acetate (PVAc) and nano lithium aluminate (LiAlO2) on the crystalline structure of the poly vinylidene
fluoride ecoe hexa fluoro propylene (PVDF-co-HFP) matrix containing ethylene carbonate (EC) and
diethyl carbonate (DEC) as plasticizers. FT-IR analysis confirmed both the good dissolution of the
LiCF3SO3 salt and the good interaction of the nano LiAlO2 filler with the polymer matrix. TG analysis
showed the good thermal stability of the LiAlO2 samples compared to the free one. Also, addition of nano
LiAlO2 filler enhanced the conductivity value of the polymer composites electrolytes. The sample containing
2 wt% of LiAlO2 showed the highest conductivity value, 4.98
103 U 1 cm1 at room temperature,
with good thermal stability behavior (Td ¼ 362 C). This good conductive and thermally stable
polymer nano composite electrolyte was evaluated as a promising membrane for lithium ion batteries
application.