Bio-host pectin complexed with dilithium borate based solid electrolytes for polymer batteries

Abstract

Solid state polymer batteries have become the center of focus to fulfill the goal towards the accomplishment of storage systems with high power and energy densities in affordable cost and safety. In this connection, a new Solid Biopolymer Electrolyte (SBE) membrane, pectin complexed with dilithium borate, was prepared using solution casting technique and investigated by XRD, AC impedance and LSV techniques. The ion conductivity to a maximum of 1.69 × 10−5 Scm−1 for 60 (M.wt%) pectin: 40 (M.wt%) Li2B4O7 composition was attributed to the addition of Li2B4O7, which increases the number of conducting ion species. Increase in conductivity with temperature can be correlated with the free volume model. The lowest value of activation energy and an electrochemical stability window of 3.11 V were obtained for the highest ion conducting sample, indicating that this composition is a promising biopolymer membrane electrolyte in all solid state batteries.