PVA/PVDF/LiOH Polymer Blends: A Promising Route for Enhanced Ionic Conductivity in Solid‐State Electrolytes

This study investigates the correlation between varying concentrations of polyvinyl alcohol (PVA) and polyvinylidene fluoride (PVDF), incorporating 1‐wt% LiOH, and their impact on the structural and electrical properties of polymer blends prepared via the solvent evaporation method. A comprehensive set of experimental techniques, including x‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FTIR), and electrochemical impedance spectroscopy (EIS), was employed for material characterization. XRD analysis revealed a composition‐dependent evolution of crystallinity, with a noticeable reduction at intermediate PVA/PVDF ratios, accompanied by the emergence of the β ‐phase of PVDF, identified by the characteristic peak at 20.2°. FTIR results further confirmed polymer–salt interactions, indicating significant structural modifications within the blends. In particular, the absorption bands at 1401 and 840 cm −1 , associated with CH and CF 2 vibrations, respectively, corroborate the presence of the β ‐phase, in agreement with the XRD findings. The electrical properties were evaluated using EIS in combination with equivalent circuit modeling. The results demonstrate a strong dependence of electrical resistance on polymer composition, with the lowest resistance (1.8 × 10 3 Ω ) and the highest electrical conductivity (7.13 × 10 −6 S · cm −1 ) observed for the 75‐PVA composition. These findings indicate that PVA/PVDF/LiOH blends are promising candidates for technological applications, particularly in energy storage systems.