Magnesium chloride-infused chitosan-poly(vinyl alcohol) electrolyte films: A versatile solution for energy storage devices
Pradeep Nayak, Ismayil, Y.N. Sudhakar
Abstract
The potential of advanced energy storage devices lies in using solid biodegradable polymer electrolytes. This study is focused on a solid blend polymer electrolyte (SBPE) film based on chitosan (CS)–poly (vinyl alcohol) (PVA) blend matrix doped with magnesium chloride (MgCl 2 ) salt via solution casting. The interaction of MgCl 2 was verified via X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The SBPE with 30 wt% MgCl 2 exhibited the highest ionic conductivity of 1.24 × 10 −6 S cm −1 and an ionic transference number of 0.92. Thermogravimetric analysis (TGA) revealed thermal stability up to 220 °C, and the electrolyte showed favorable electrochemical stability at 3.09 V, as revealed by the I-V analysis. The sample's cyclic voltammetry (CV) curve with the highest conductivity showed distinct oxidation and reduction peaks. The discharge performance of Mg|(CS + PVA+ MgCl 2 )|Cathode cell with different combinations of cathode materials illustrated the potential of the SBPE for use in magnesium-ion batteries. The CV response indicated non-faradaic behavior for the fabricated supercapacitor, with a specific capacitance of 5.80 Fg −1 at 5 mVs −1 . The non-flammable electrolyte ensures safe use in battery applications, presenting a sustainable, biodegradable, and cost-effective solution for advanced energy storage systems.