Electrical Properties of Lithium-Ion Conducting Poly (Vinylidene Fluoride-Co-Hexafluoropropylene) (PVDF-HFP)/Polyvinylpyrrolidone (PVP) Solid Polymer Electrolyte

Abstract

Lithium bromide ionic salt dispersed with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/polyvinylpyrrolidone (PVP) blend polymers have been prepared by solution casting, and used as an electrolyte for the improvement of solid-state lithium batteries. The structural and molecular bond identification studies of polymer electrolytes have been studied and confirmed using x-ray diffraction (XRD) and Fourier-transform (FTIR) analysis. Electrical characterizations of solid polymer films have been studied by AC impedance analysis. The higher conducting sample follows the Arrhenius relationship, and the conductivity based on the dielectric constant obeys modified Arrhenius behavior. The ion transport mechanisms coincide with the correlated barrier height (CBH) model, and the ionic diffusion was verified through the tunneling mechanism. Optical properties for the prepared polymer electrolytes have been investigated using ultra violet (UV) spectrum analysis. From this analysis, the higher conductivity polymer electrolyte has a minimum band gap at 4.14 eV.