After, the polymer gel electrolyte (PGEs) was prepared following the compositions
listed in Table 1. All components in each electrolyte were homogeneously with ILE and stirred at room temperature
for 7 h. Finally, to prepare the nanocomposite gel electrolyte, 10wt%PVDF-HFP/PEO (8:2) was chosen as polymer
matrix. TiO2 and SiO2 nanoparticles were then added at 0.25, 0.5, 1.0 and 2.0 wt% into polymer matrix. After that, 2
ml ILE was filled and homogeneously stirred at room temperature for 7 h.