Moringa oleifera gum-based bio-membrane electrolyte for lithium-ion conducting battery applications

Abstract

Lithium-ion conducting bio-membranes based on Moringa oleifera gum (MOG) and LiNO₃ are fabricated through the solution casting method. Samples containing 1 g MOG incorporated with 0.6 to 0.8 mol.wt% LiNO₃ salt concentrations are prepared. The amorphous nature of the prepared samples is verified through XRD analysis. The glass transition temperature of the prepared samples is measured by DSC technique. AC impedance spectroscopy indicates that the sample 1 g MOG + 0.8 mol.wt% LiNO₃ gives the highest ionic conductivity measured as 5.46 × 10⁻³ S/cm. Additionally, CV, LSV, and transference number studies are taken for the highest ion conducting sample to evaluate its electrochemical stability. A primary lithium-ion conducting battery is constructed by using the highest ion conducting sample as an electrolyte for the system and the open circuit voltage is observed as 2.19 V. Then, a rechargeable lithium-ion conducting coin cell is constructed, and its performances are studied.