Evaluation on electrochemical properties of lithium ions battery-based PMMA-PLA blend incorporation of [EDIMP]TFSI hybrid gel polymer electrolyte

Abstract

AbstractThis study focuses on developing a novel hybrid gel polymer electrolyte (HGPEs) for lithium-ion batteries. The HGPEs are composed of a hybrid polymer of 80 wt.% PMMA and 20 wt.% PLA, doped with 20 wt.% LiTFSI and incorporated with various contents ionic liquid namely Ethyl-dimethyl-propylammonium bis(trifluoromethylsulfonyl)imide ([EDIMP]TFSI) are successfully prepared and the lithium-ion batteries performance were investigated. This work aims to investigate the influence of the ionic liquid on the electrical properties, cation transference number (tLi+), electrochemical stability window, and charge-discharge performance of the PMMA-PLA-LiTFSI HGPE system. Among the different samples tested, the HGPE containing 20 wt.% [EDIMP]TFSI (E-TFSI 20) exhibited the most promising results. It achieved an optimum ionic conductivity of 3.90 × 10− 3S cm− 1, an increasedtLi+from 0.63 to 0.79, and an extended electrochemical stability window from 4.3V to 5V. Temperature dependence studies revealed that all the HGPE systems followed the Arrhenius characteristic, and their activation energies were calculated. Dielectric studies revealed ionic behavior and suitable capacitance with varying frequencies of the HGPEs system. The most favorable electrolyte was selected based on the highest ionic conductivity observed in each HGPE system. It was utilized in a Li metalǀHGPEsǀGraphite cell configuration. The discharge capacity of the cells using LiTFSI 20 and E-TFSI 20 electrolytes were measured as 152.06 mAh g− 1and 71.15 mAh g− 1, respectively, at a current density of 3.72 A g− 1.