Preparation and properties of composite polymer electrolyte modified with nano-size rare earth oxide

Abstract

Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) based composite polymer electrolyte (CPE) modified with CeO₂, La₂O₃ and Y₂O₃ nano-rare earth oxides was prepared by phase inversion technique. Physical and chemical properties of the modified CPEs were studied by SEM, TG-DSC and electrochemical methods. The results show that the CPE modified with 10% La₂O₃ (mass fraction) has the best practical applicability, which indicates that the thermal and electrochemical stability can reach over 400 °C and 4.5 V, respectively, and temperature dependence of ionic conductivity follows Vogel-Tamman-Fulcher (VTF) relationship and ionic conductivity at room temperature is up to 3.3 mS/cm. The interfacial resistance R_i reaches a stable value about 557 Ω after 6 d storage.

Keywords

poly(vinylidene fluoride-co-hexafluoropropylene) / composite polymer electrolyte / nano-rare earth oxide / lithium ion polymer battery

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