Enhanced electrical properties of spun blend polymer composite electrolyte PMMA – PVdF-co-HFP – PEO/ LiBF₄ containing nano SiO₂ for lithium-ion batteries application

Electrospun fiber nanocomposite electrolytes containing different concentrations of nano SiO₂ filler and lithium tetrafluoro borate salt were successfully synthesized using electrospinning technique. Structural characterization was performed using different techniques such as X-ray diffraction (XRD), Fourier – transform infrared spectroscopy (FT-IR), Thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), Scanning electron microscope (SEM) and Barrett-Joyner-Halenda (BJH) analysis. The sample containing 7 wt. % nano SiO₂ filler (NFEC4) exhibited good thermal stability (high decomposition temperature), high total pore volume, and suitable pore diameter. The same sample showed high ionic conductivity (ơ_AC = 1.023 × 10^–3 Ω⁻¹.cm⁻¹) at room temperature. A comparison with previously studied similar electrolyte systems was performed. The application results showed the good performance of this sample, making it a promising electrolyte for lithium-ion batteries.