Passive Filler Ionic Conductivity Enhancement of Poly(Ethylene Glycol) Diacrylate Solid-State Electrolytes

Abstract Solid polymer electrolytes are promising alternatives to traditional liquid electrolytes for use in lithium batteries. Poly(ethylene glycol) diacrylate (PEGDA) is a versatile cross-linkable monomer that promotes easy incorporation of a variety of filler materials for solid electrolyte synthesis without the use of solvents. This study examines the effects that varying concentrations of SiO2, CeZrO4, V2O5, and succinonitrile have on the electrochemical performance of UV-cured PEGDA electrolytes. A composite polymer electrolyte containing 8% V2O5 and 30% succinonitrile in PEGDA was synthesized and exhibited a room-temperature ionic conductivity of 1.43x10-4 S/cm. The improvement in ionic conductivity of this electrolyte may be attributed to the synergistic effect of the two incorporated fillers resulting in decreased crystallinity of the polymer matrix. This study demonstrates that polymer electrolyte characteristics can be optimized by combining the benefits of multiple fillers.