Performance analysis of electrochemical cell using magnesium-doped tamarind gum polymer electrolyte

Solid bio-degradable Polymer Electrolytes (SBPEs) seem to be the most widely preferred choice for low-cost and energy-efficient storage systems. In the present work, Mg 2+ ion-conducting SBPEs are synthesized by Tamarind Gum (TG) mixed with Magnesium Acetate by the solution-casting method. To know about the structural analysis, X-ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) are performed. The deconvolution spectra of XRD and FTIR provide the information about the degree of crystallinity and percentage of free ions. Glass transition temperature ( T g ) is noticed by Differential Scanning Calorimetry (DSC) analysis. Using AC impedance analysis, the maximum ionic conductivity is noticed for the sample containing 1 g of Tamarind gum and 0.3 g of Magnesium Acetate (3 TAC) is 5.54 × 10 −6 S/cm. All the prepared SBPEs obey Arrhenius behavior. Using this temperature-dependent plot, the minimum Activation energy ( E a ) observed for 3 TAC is 0.2 eV. The conduction mechanism of Sample 3 TAC obeys the Overlapping Large Polaron Tunneling (OLPT) model and Quantum Mechanical Tunneling model (QMT) model which is confirmed by the temperature-dependent conduction mechanism. By the loss tangent spectra, the Relaxation time ( τ ) is calculated, and it is minimum for 3 TAC as 3.24 × 10 –5 s. Transference Number Measurement (TNM) analysis is carried out by Wagner’s polarization method. By the optimized sample 3 TAC, the electrochemical cell is fabricated and the Open-Circuit Voltage (OCV) of 1.89 V is observed.