Development and characterization of biopolymer electrolyte based on gellan gum (GG) with lithium chloride (LiCl) for the application of electrochemical devices

The biopolymer electrolyte based on gellan gum with various concentrations of lithium chloride salt has been prepared using solution casting technique and optimized with high ionic conductivity of 4.08 x 10(-3) S cm(-1) for the composition of 1 g gellan gum + 1.2 M wt% of LiCl using AC impedance analysis. XRD has been used to study the crystalline/amorphous nature of the prepared membrane. The complex formation between the polymer and the salt is analyzed using FTIR technique. DSC analysis has been done to evaluate the glass transition temperature of the prepared electrolytes. Transference number measurement was done to confirm that the conduction is due to cations. CV analysis was done to measure the cyclic stability of the prepared membrane which shows an adequate result by reciprocating the pattern for 50 cycles. Primary lithium-ion conducting battery is constructed using highest lithium-ion conducting membrane. It shows an open circuit voltage of 1.88 V.