Copper Ion-Conducting PVP-Based Solid Polymer Electrolyte with TiO₂ Nanofiller for Solid-State Battery Applications Cu Ion Solid Polymer Electrolytes for Energy Storage Devices

Abstract

The growing demand for sustainable and efficient energy storage solutions has led to the development of rechargeable battery technologies. Solid polymer electrolytes (SPEs) have been considered as a promising alternative to the conventional liquid electrolytes because of their better safety and mechanical flexibility. A series of solid polymer electrolytes based on polyvinylpyrrolidone (PVP) doped with Cu²⁺ were prepared by solution casting in the present study. The formation of complex was confirmed by FTIR and UV-Visible spectroscopy. The ionic conductivity at room temperature was highest (1.07 × 10⁻³ S cm⁻¹) for the 15% Cu²⁺ doped PVP electrolyte. The conductivity was further improved to 1.65 x 10^-3 S cm^-1 on incorporation of 0.2% TiO₂ nanofiller. Temperature dependent studies showed the optimum operating temperature to be 60 °C with maximum conductivity of 1.97 × 10⁻³ S cm⁻¹. The Cu²⁺/PVP/TiO₂ composite electrolyte has the potential to be applied in the flexible, all-solid-state and temperature-variable rechargeable battery systems.