锂离子电池用PVdF/PMMA电纺膜的制备及电化学性能(英文)  

Preparation and Electrochemical Properties of Electrospun PVdF/PMMA Membranes for Lithium Ion Batteries

作　　者：曹琪[1] 李晓云[1] 钟正[1] 王先友[1] 陈权启[1] 蒋生辉[1] 

机构地区：[1]湘潭大学化学学院环境友好化学与应用教育部重点实验室,湖南湘潭411105

出　　处：《湘潭大学自然科学学报》2011年第3期89-95,共7页Natural Science Journal of Xiangtan University

基　　金：环境友好化学与应用教育部重点实验室资助项目(10HJYH09)

摘　　要：通过电纺法制备PVdF/PMMA纤维膜.电纺膜的形貌,结构和热行为分别用扫描电镜(SEM),红外(FT-IR),差热扫描量热法(DSC)表征.将电纺膜浸入1 mol/L LiClO4/EC+PC(1∶1,V/V)溶液中,从而得到聚合物电解质.对聚合物电解质的电化学性能如离子电导率,电化学稳定性,界面阻抗和电池性能也进行了研究.结果表明,PMMA的加入增加了聚合物电解质的离子电导率,提高了聚合物电解质的电化学稳定性.PVdF/PMMA聚合物电解质的室温离子电导率高达3.5 mS/cm,电化学稳定性达5.1 V.PMMA的加入降低了界面阻抗.另外,由PVdF/PMMA聚合物电解质组装的Li/PE/LiFePO4电池具有良好的循环性能.试验表明,电纺法可能很有希望应用于制备微孔PVdF/PMMA聚合物电解质.In this paper,fibrous membranes of PVdF/PMMA were fabricated via electrospinning method.The morphology,structure and thermal behaviors of the electrospun membranes were characterized by scanning electron microscopy（SEM）,fourier transform infra-red（FT-IR） spectroscopy and differential scanning calorimetry（DSC）,respectively.Polymer electrolytes were prepared by immersing membranes into 1 mol/L LiClO4/EC＋PC（1∶ 1,V/V）.Electrochemical properties of ionic conductivity,electrochemical stability,interfacial resistance and cell performance of the electrolyte were investigated.The results suggested that the addition of PMMA increased the ionic conductivity and electrochemical stability of the polymer electrolyte.The PVdF/PMMA polymer electrolyte exhibited a high ionic conductivity of 3.5 mS/cm at room temperature and electrochemically stable up to 5.1 V.Also,the addition of PMMA into PVdF decreased the interfacial resistance with lithium electrode.In addition,Li/PE/LiFePO4 cell with PE based on electrospun PVdF/PMMA membrane exhibited excellent cycling performance.These results revealed that this new method may be very promising for preparing microporous PVdF/PMMA polymer electrolytes.

关 键 词：聚偏氟乙烯 聚甲基丙烯酸甲酯 电纺 膜 锂离子电池 

分 类 号：O646[理学—物理化学]