EFFECT OF FLY ASH-DERIVED SILICA ON THE FUNCTIONAL GROUP INTERACTIONS AND IONIC CONDUCTIVITY OF CHITOSAN/LIOH SOLID POLYMER ELECTROLYTES MEMBRANE

Abstract

Solid electrolyte membrane based on environmentally friendly materials using SiO₂ dispersed chitosan/LiOH solid electrolyte can be used as one of the materials Coal fly ash waste in the form of silica is being developed. Synthesis and characterization of solid polymer membranes based on chitosan and LiOH with the addition of Silica (SiO₂) from fly ash aims to increase ionic conductivity and stability membrane. Variations in the composition of SiO₂ addition of 2% (S2), 4% (S4), and 6% (S6) on the chitosan mass using the solution casting method. Meanwhile, testing to determine membrane functional groups using Fourier Transform spectroscopy Infrared Spectroscopy (FTIR) and Electrochemical Impedance Spectroscopy (EIS).The FTIR results for samples (S2), (S4), and (S6) show changes in intensity.and peak shifts in the O–H and N–H functional groups at wave numbers 3397, 3430, and 3410 cm^-1, respectively. Meanwhile, the CH functional group at wave number 2925, 2939, and 2935 cm^-1 , respectively. The functional groups C=O and C=C in the numbers waves 1655, 1598, and 1597 cm^-1 , respectively. For the functional groups Si–O–Si, and Si–O are formed at wave numbers 787, 791, and 790 cm^-1, respectively. Cluster The Si–O–Si function, and Si–O indicate the presence of intermolecular interactions between fly silica.ash dispersed on chitosan and LiOH membranes. There is a shift in the number waves cause functional groups to change, so that the mobility of charge carriers samples (2), (S4), and (S6) increased. The addition of silica fly ash can improve chemical structure and increase the interactions between molecules. Thus, the polymer membrane SiO₂ dispersed chitosan/LiOH solid electrolyte can be used as one of the materials safe and efficient solid electrolyte for lithium batteries.