The effect of (TiO2 and SiO2) nano-filler on solid polymer electrolyte based LiBOB

Solid polymer electrolyte (SPE) is one of the most promising electrolytes to replace liquid electrolytes in the battery system to avoid leakage and to enhance the packaging efficiency. However, SPEs still have a much lower ionic conductivity compared to the liquid electrolyte. The purpose of this research is to investigate the effect of incorporating fillers on SPE to ionic conductivity characteristics and battery performance. The fillers employed in this study were SiO2 and TiO2 respectively 10 % in the ratio 4:1 of poly (vinylidene fluoride)-co-hexafluoropropylene (PVDF HFP) and lithium bis(oxalate)borate (LiBOB) compositions. The obtained SPE was characterized by using Electrochemical Impedance Spectroscopy (EIS), Cyclic Voltammetry (CV), and Scanning Electron Microscope (SEM). This study revealed that 10 wt% SiO2 concentrations provided ionic conductivity 2.42 × 10−6 S cm−1, higher than SPE with TiO2, and without fillers. These results are confirmed by the CV results showing the highest reduction peak, current of -0.63 mA and voltage of 2.94 V, and discharge capacity of 47.8 mAh/g. In addition, SEM results reveal that the incorporated-SiO2 SPE has porous morphology with diameter 2.8 um on average, assisting its intercalation process as well.