Co-blending based tribasic PEO-PS-PMMA gel polymer electrolyte for quasi-solid-state lithium metal batteries

A novel polymer film is developed by trapping tribasic gel polymer electrolyte (GPE), which blended the polyethylene glycol (PEO), polystyrene (PS), and poly(methyl methacrylate) (PMMA). The properties of the PEO-PS-PMMA polymer film and PEO-PS-PMMA GPE were investigated. The ionic conductivity of the PEO-PS-PMMA GPE is 0.12 mS/cm at 25 °C. Li + transference number of PEO-PS-PMMA GPE is 0.2. Besides, PEO-PS-PMMA GPE shows high electrochemical stability and excellent interface stability to Li metal electrode. Li/PEO-PS-PMMA/LiFePO 4 cell achieved an initial specific discharge capacity of 97 mAh/g and good cycle performance at the current density of 0.1 C. This GPE is promising to be applied to rechargeable Li batteries with high safety and long cycle life.