Development of novel cocculus hirsutus/PVA/Mg2+ polymer composite for advanced energy storage devices

This study reports the successful development of solid polymer electrolytes based on Cocculus hirsutus(CH), polyvinyl alcohol(PVA) and magnesium chloride (MgCl2) using the solution casting method. Cocculus hirsutus was added to improve sustainability and ion transport PVA acted as the host polymer & MgCl2 provided mobile charge carriers. XRD results showed reduced crystallinity after Cocculus hirsutus addition indicating increased amorphous content that supports improved ionic conduction. FTIR spectra confirmed strong molecular interactions among the polymer, salt & natural additive. Electrochemical impedance spectroscopy(EIS) demonstrated the ion transport with the highest ionic conductivity of 1.17 × 10–4 S cm−1 achieved for the CH/PVA film containing 0.4 g of MgCl2. Electrochemical studies confirmed stable capacitive behavior with a specific capacitance of 104.34 F g−1 and good electrochemical stability. DSC analysis of CHM4 polymer electrolyte shows moisture loss, improved polymer chain mobility & excellent thermal stability confirming its suitability for solid-state energy storage. CHM4 polymer electrolyte demonstrates excellent flexibility & flame resistance, ensuring safe, reliable use in solid-state energy devices. The polymer electrolyte ensures mechanical stability and controlled deformation, supporting reliable long-term supercapacitor and battery performance. Highlighting its potential for next-generation energy storage applications particularly flexible supercapacitor devices. • Magnesium ion conducting Cocculus hirsutus /PVA/MgCl2 polymer electrolytes are prepared using solution casting method. Cocculus hirsutus is a novel biopolymer. • Enhanced amorphous nature and complex formation are confirmed by XRD and FTIR studies. • The improved ionic conductivity of 1.17 × 10–4 S/cm is achieved for 0.4 g MgCl2 concentration. • Dielectric properties of the prepared electrolytes are also analyzed by EIS studies. • The higher conducting polymer electrolyte is used to fabricate EDLC and this fabricated device shows specific capacitance of 8.92 mF/g.