Investigations on lithium acetate-doped PVA/PVP solid polymer blend electrolytes

Lithium ion conducting solid polymer blend electrolytes (SPBE) are prepared using the host polymers poly[vinylalcohol] (PVA), poly[vinyl pyrrolidone] (PVP) and the lithium acetate. The complexation between the polymers and salt is confirmed by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The glass transition temperature of the prepared polymer electrolytes is determined by differential scanning calorimeter. Surface morphology of the polymer electrolytes is identified by scanning electron microscopy. Ionic conductivity of the solid electrolytes is studied using impedance analyzer in the frequency range of 42 Hz–1 MHz. The higher electrical conductivity of 5.79 × 10 −6 S cm −1 and 1.400 × 10 −4 S cm −1 is determined for 50PVA:50PVP:25 wt% lithium acetate system at 303 K and 363 K temperature, respectively. The dielectric and loss tangent analysis is also carried out for prepared polymer electrolyte and the higher-conductivity sample at different temperatures. The transference numbers of polymer electrolytes are calculated by Wagner’s polarizing technique and also confirmed by Bruce–Vincent technique.