纳米氧化镧掺杂PEO基SPEs的离子导电性能研究  

Study on Ionic Conductivity of SPEs Based on PEO/nano-La_2O_3

作　　者：杨树颜[1,2] 焦元启[1,2] 骆伟新[1,2] 

机构地区：[1]东莞理工学院广东高校化工清洁生产与绿色化学品工程技术开发中心,广东东莞523808 [2]东莞市清洁生产科技中心,广东东莞523808

出　　处：《稀土》2016年第3期31-35,共5页Chinese Rare Earths

基　　金：国家自然科学基金项目(51303026)

摘　　要：以PEO为基体,掺杂纳米氧化镧(nano-La_2O_3),利用溶液浇铸的方法,制备nano-La_2O_3复合型全固态聚合物电解质(SPEs),并且表征聚合物电解质的电化学性能和热力学性能。DSC分析表明,nano-La_2O_3有效地抑制了PEO的结晶,提高聚合物的无定型程度。SPEs电导率随着nano-La_2O_3含量增加先增加后减小,在nanoLa_2O_3含量为6%(质量分数)时,SPEs在30℃下电导率达到最大2.10×10^(-5)S/cm,在80℃下达到2.64×10^(-3)S/cm,并且离子电导率与温度的关系服从VTF方程。TG分析表明SPE-6的开始分解温度达到320℃,具有良好的热稳定性,表明了掺杂nano-La_2O_3的PEO基SPEs具有潜在的应用价值。Solid state electrolytes（ SPEs）,based on poly ethylene oxide（ PEO） matrix and nano- Lanthanum Oxide（ nano- La_2O_3）,are prepared by solution- casting method,and their electrochemical and thermal performances are characterized in detail. The incorporation of nano- La_2O_3,from DSC measurement,can restrict the crystalline behavior of PEO effectively,leading to the improvement in amorphous state of PEO. With increasing nano- La_2O_3 contents,the ionic conductivities of SPEs increase to a maximum value,about 2. 10 × 10-5S / cm for 30 ℃ and 2. 64 × 10-3S / cm for 80 ℃ at the nano-La_2O_3 contents of 6%,and then fall down. Meanwhile,the relationship of ionic conductivity and temperature obeys the VFT function. Furthermore,the initial decomposition temperature of PEO- 6 reaches as far as 320 ℃,showing the good thermal stability and potential application of SPEs in the lithium battery industry based on PEO matrix and nano- La_2O_3.

关 键 词：纳米氧化镧 全固态聚合物电解质 聚氧乙烯 

分 类 号：TQ150.1[化学工程—电化学工业]