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

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.

Automated summary

The use of lithium bromide ionic salt dispersed with PVDF-HFP/PVP blend polymers has been studied for solid-state lithium batteries, with higher conducting samples following the Arrhenius relationship and ion transport mechanisms coinciding with the correlated barrier height (CBH) model. Conductivity based on dielectric constant obeys modified Arrhenius behavior and ionic diffusion is verified through tunneling mechanism.