The improvement in electrochemical properties with the addition of SiO2 into PMMA/PLA-LiBOB Gel Polymer Electrolytes Based Lithium Ions Battery

Abstract

The present work investigates the impact of SiO2 nanofiller on the electrochemical properties of gel polymer electrolytes (GPEs) composed of PMMA/PLA-LiBOB. The study encompasses two distinct systems: PMMA/PLA-LiBOB (System I) and PMMA/PLA-LiBOB-SiO2 (System II). Nyquist plots were generated to analyze the samples' bulk resistance (Rb), and it was found that Rb value shows a decreasing trend with the incorporation of SiO2. The ionic conductivity increases from 1.69×10-6 S cm-1 to 1.37×10-3 S cm-1 at room temperature, with the highest composition achieved at 6 wt.% of SiO2. Dielectric properties revealed that the addition of SiO2 nanofiller led to the enhancement of dielectric constant (ε′) and dielectric loss (ε″), attributed to SiO2 nanofiller with high orientation polarizability and space charge polarization effects. Linear Sweep Voltammetry (LSV) measurements from both GPE samples are 4.1 V (System I) and 4.7 V (System II). Comparative electrochemical performances of the batteries assembled in System I and System II were conducted, demonstrating the superiority of System II in terms of stability and cycling performance. The differential capacity analysis further supported the enhanced electrochemical activity upon SiO2 nanofiller incorporation.