以PEO为基体,掺杂纳米氧化镧(nano-La2O3),利用溶液浇铸的方法,制备nano-LaO3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-La2O3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-La2O3含量增加先增加后减小,在nano-La2 O3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2.64×10-3S/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-La2O3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-La2 O3),are prepared by solution-casting method,and their electrochemical and thermal performances are characterized in detail.The incorporation of nano-La2O3,from DSC measurement,can restrict the crystalline behavior of PEO effectively,leading to the improvement in amorphous state of PEO.With increasing nano-La2 O3 contents,the ionic conductivities of SPEs increase to a maximum value,about 2.10 × 10-5 S/cm for 30 ℃ and 2.64 × 10-3 S/cm for 80 ℃ at the nano-La2O3 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-La2 O3.
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