Conducting properties of nanocomposite polymer electrolytes based on polyethylene glycol diacrylate and SiO2 nanoparticles at the interface with a lithium electrode

Abstract

Nanocomposite polymer electrolytes based on polyethylene glycol diacrylate and 1 M LiBF₄ solution in γ-butyrolactone with addition of SiO₂ nanoparticles were synthesized and studied. Resistance measurement at the Li/electrolyte and Li/nanocomposite electrolyte interface by the time-resolved electrochemical impedance showed its significant decrease in the presence of SiO₂ nanoparticles. Charge-discharge cycling of prototypes of Li/LiFePO₄ batteries for 50 cycles also showed the advantage of using nanocomposite polymer electrolytes over electrolytes without SiO₂ additives.