High Performance Lithium Ion-conducting Plasticized Biopolymer Electrolyte for Supercapacitor Application

Lithium-ion based Solid Polymer Electrolytes are synthesized by incorporating lithium perchlorate (LiClO 4 ) salt with Iota-Carrageenan (IC) / Acacia Gum (AG) plasticized with ethylene glycol (EG) by solution casting method. The X-ray diffraction and Fourier transform infrared analysis are used to analyze the structural and molecular complexation. AC impedance analysis spectra show that the incorporation of 15 wt. % of LiClO 4 salt into a blend polymer electrolyte (IAO15) shows the ionic conductivity of 2.02 ×10 − 2 S/cm and minimum activation energy (0.022 eV). The conduction mechanism for IAO15 sample follows two models (CBH and QMT). The dielectric and modulus spectra confirm the non-Debye nature of the sample. From the Transference Number Measurement, it is observed that the conductivity is due to Li ions and IAO15 sample is chosen for the fabrication of a Symmetrical supercapacitor. At 3.6 Ag − 1 current density, the power and energy densities are noted as 7452 Wkg − 1 and 165.6 Whkg − 1 respectively.