【作者】 肖围； 李新海； 郭华军； 王志兴； 杨波； 黄思林；

【Author】 Xiao Wei,Li Xinhai~*,Guo Huajun,Wang Zhixing,Yang Bo,Huang Silin(School of Metallurgical Science and Engineering, Central South University,Changsha 410083,China)

【机构】 中南大学冶金科学与工程学院；

【摘要】 本文通过倒相法制备了三种不同含量n-La₂O₃掺杂PVDF-HFP基复合聚合物电解质膜,将其分别于1.0 mol/LLiPF₆-EC/DMC/EMC中浸泡30 min即得改性复合聚合物电解质,并采用SEM、XRD、TG和电化学等手段对其理化性能进行了表征。SEM结果表明,10%n-La₂O₃掺杂PVDF-HFP基复合聚合物电解质膜表面均匀、孔径适当且内部含有丰富的相互连通的小孔;XRD谱图结果表明n-La₂O₃与聚合物基体分子间存在作用力;TG结果表明分子筛改性膜的热稳定性有明显的提高,在360℃内仍保持很好的热稳定性;EIS和LSV结果也表明复合膜的电导率和电化学稳定窗口分别达到2.387 mS·cm^-1和5.2V;温度与离子电导率之间的关系遵循VTF方程。更多还原

【Abstract】 Three kinds of n-La₂O₃ with different masses modified PVDF-HFP based composite polymer electrolytes of lithium ionic batteries were prepared by immersing the three kinds of polymer electrolyte membranes prepared by phase inversion method into 1.0 mol/L LiPF₆-EC/DMC/EMC electrolyte for 30 min and characterized by SEM、XRD、TG and electrochemical means in the paper.The results of SEM and XRD indicated the 10%n-La₂O₃ modified membranes had homogeneous surface and abundant interconnected micro-pores inner and there may exist interaction force between n-La₂O₃ and polymer matrix respectively; the result of TG displayed distinguished improvement in term of thermal stability and the modified membrane can keep thermal stable in a range of 360℃;the results of EIS and LSV also showed the ionic conductivity and electrochemical stability window of the membrane can reach 2.387 mS·cm^-1 and 5.2 V,respectively;temperature dependence of ionic conductivity followedVogel-Tamman-Fulcher relation.更多还原