Fabrication of Symmetric Super Capacitor Using Lithium-ion Conducting IOTA Carrageenan-Based Biopolymer Electrolytes.

Solid-state polymer electrolyte system that relies on an Iota carrageenan/Acacia gum blend and ethylene glycol as plasticizer incorporated with LiNO₃ has been synthesized using the solution cast technique. The structural characterization has done by X-ray diffraction and Fourier transform infrared (FTIR) analysis. FTIR deconvolution reveals that ion–ion interaction analysis and the free ion and contact ion percentage. The electrolyte with 30 wt% LiNO₃ (IAN30) has the higher conductivity as 1.77 × 10⁻³ S cm⁻¹, activation energy as 0.02 eV and ion transport number as 0.999. The non-Debye property of polymer electrolytes is confirmed by studies on the frequency dependence of dielectric and, dielectric loss tangent parameter β. UV spectra of IAN30 also confirms the reduction in band-gap. IAN30 is used for the fabrication of Electric double layer capacitor (EDLC) and Electrochemical cell. There are no redox peaks in the Cyclic voltammetry response through its entire potential range for EDLC behavior. From the galvanostatic charge/discharge studies of prepared symmetrical capacitor, discharge time and specific capacitance (C_s) values are calculated as 16s and 22 F/g respectively. [ABSTRACT FROM AUTHOR]