不同分子筛对PVDF-HFP基凝胶态聚合物电解质性能影响  

Effect of molecular sieves on the performances of PVDF-HFPbased gel polymer electrolytes

作　　者：缪畅[1] 肖围[1] 

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434300

出　　处：《电池工业》2013年第6期295-300,共6页Chinese Battery Industry

摘　　要：通过倒相法制备三种不同分子筛(SAPO-11、MCM-41和ZSM-5)掺杂的PVDF-HFP基复合聚合物电解质膜,将它们分别浸泡于1.0mol/L LiPF6-EC/DMC/EMC(体积比1∶1∶1)的电解液中活化30min,得到分子筛改性复合聚合物电解质,并采用SEM、FT-IR、TG-DSC和电化学等手段对其形貌和电化学性能进行表征。SEM结果表明分子筛改性膜表面均匀、孔径适当且内部含有丰富的相互连通的微孔;FT-IR分析结果证明分子筛和聚合物分子间存在某种作用力;TG-DSC结果表明分子筛改性膜的热分解温度有明显的提高,在350℃内能保持很好的热稳定性;EIS和LSV结果表明分子筛改性膜的电导率和电化学稳定窗口得到明显的改进,其中ZSM-5改性膜的电导率和电化学稳定窗口分别高达3.65mS·cm-1和5.2V。PVDF-HFP based composite polymer membranes,doped with three kinds of different molecule sieves,SAPO-11、MCM-41and ZSM-5,respectively,were prepared by phase inversion method,and immersed into 1.0mol/L LiPF6-EC/DMC/EMC（1∶1∶1）electrolyte for 30min to obtain three kinds of modified PVDF-HFP-based composite polymer electrolytes of Li-ion battery.The physicochemical performances of the as-prepared polymer electrolytes were characterized by SEM,FI-IR,TG-DSC and electrochemical methods.The results of SEM indicated that the molecule sieves modified membranes had homogeneous surface and abundant interconnected micro-pores inner and there may exist interaction force between the molecule sieve and polymer matrix confirmed by FT-IR.The results of TG-DSC showed that the improvement in thermal stability and thermal decomposing temperature of modified membranes could keep thermal stability under 350℃.The results of EIS and LSV also showed that the ionic conductivity and electrochemical stability window of ZSM-5modified membrane could reach 3.65mS·cm-1 and 5.2Vrespectively.

关 键 词：分子筛 PVDF-HFP 聚合物电解质 倒相法 改性 

分 类 号：TM912.9[电气工程—电力电子与电力传动]