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

来源期刊:中南大学学报(英文版)2012年第12期

论文作者:肖围 李新海 郭华军 王志兴 杨波 吴贤文

文章页码:3378 - 3384

Key words:poly(vinylidene fluoride-co-hexafluoropropylene); composite polymer electrolyte; nano-rare earth oxide; lithium ion polymer battery

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 ºC 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 Ri reaches a stable value about 557 Ω after 6 d storage.

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