Electroanalytical studies on polymer gel electrolytes containing heat resistant polymethyl methacrylate, succinonitrile solvent and Lithium perchlorate salt

Abstract

Abstract In this work, Lithium-ion conducting polymer gel electrolytes (PGE) based on heat resistant polymethylmethacrylate (PMMA), succinonitrile (SN) solvent and Lithium perchlorate (LiClO4) salt in different molarities have been prepared using solution casting technique. The effect of varying LiClO4 salt within the heat resistant PMMA matrix containing SN solvent is investigated. The PGE with PMMA/SN matrix and 1.5 M LiClO4 salt demonstrated a maximum ionic conductivity of 4.9 × 10-5 S cm-1 at room temperature. The dielectric constant and dielectric loss values for each PGEs is found to be more towards high frequency side due to prevalent polarising effects. The ion-dynamics using electroanalytical studies reveals that PGE with PMMA/SN/1.5 M LiClO4 salt not only possesses good ionic conductivity but also have good diffusivity (D), mobility (μ) and Nµ values as compared to the other electrolyte specimens of this report. The thermogravimetric studies and electrochemical stability window measurement reveal that this optimized electrolyte also offers a relatively lower weight loss of < 7 % on varying the temperature from room temperature to 100° C while the working voltage range offered by each PGEs is found to be > 4 V.