Electrochemical performance of Li+-ion conducting solid polymer electrolytes based on PEO–PMMA blend matrix incorporated with various inorganic nanoparticles for the lithium ion batteries

Abstract

Abstract The electrochemical performance of the nanocomposite solid polymer electrolyte (NSPE) films comprising poly(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA) blend as host polymer matrix , lithium perchlorate (LiClO 4 ) as dopant ionic salt, and nanosize SiO 2, Al2O3 , ZnO and SnO 2 particles as inorganic nanofillers have been investigated by employing the electrochemical analyzer and precision LCR meter. The linear sweep voltammetry (LSV), cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) measurements of the NSPE films have been performed with symmetrical cells of these films at ambient temperature. It is found that these materials have a conduction stability voltage of about 3 V, excellent reversibility performance over 6 V range, the ionic transference number close to unity (> 0.98), and significant value of ionic conductivity (~ 10 –5 S cm–1 ) confirming their suitability as electrolyte/separator for the development of solid-state rechargeable lithium-ion batteries (LIBs). All these electrolyte materials exhibit negative resistance region above the stability voltage in their LSV plots. The electrochemical parameters and the negative resistance properties of these NSPEs are found greatly affected by the crystallinity, particle size, and dielectric constant of the nanofillers. The ionic conductivity of these NSPEs depends on the structural dynamics of inorganic nanoparticles incorporated ion-dipolar complexes of the materials.