碱处理改性PVDF-HFP聚合物电解质膜  

Preparation of Modified PVDF-HFP Polymer Electrolyte Membrane with Alkaline Treatment

作　　者：谢嫚[1,2] 邓锦勋[1] 吴锋[1,2] 

机构地区：[1]北京理工大学化工与环境学院 [2]国家高技术绿色材料发展中心,北京100081

出　　处：《华东理工大学学报（自然科学版）》2006年第6期686-689,共4页Journal of East China University of Science and Technology

基　　金：国家重点基础研究发展计划资助项目(2002CB211800);国家基础研究重大项目前期研究专项资助项目(2001CCA05000)

摘　　要：通过碱液处理对聚偏氟乙烯-六氟丙烯(PVDF-HFP)聚合物电解质进行改性,并利用IR、XRD、SEM等表征了改性后聚合物电解质的组成和结构。SEM照片显示改性后的聚合物电解质膜呈海绵多孔状,有利于锂离子的传导。线形伏安扫描测得该聚合物电解质在6 V以内具有很好的电化学稳定性;交流阻抗方法测得20℃时改性后聚合物电解质的离子电导率为1.272×1-0 3S/cm。此改性方法简单,成本较低,且对环境无害。A chemistry method is proposed to prepare modified polymer electrolyte membranes of poly （vinylidene fluoride-co-hexafluoropropylene） （PVDF-HFP） by alkaline treatment. The component and structure of polymer electrolyte were characterized by IR, XRD and SEM . The SEM images show that the modified polymer electrolyte films have sponginess porous structure, which benefits the increase of ionic conductivity. By using linear sweep vohammetry, it shows that the electrochemical stability of the modi- fied material is good, below 6 V. The ionic conductivity for the modified polymer electrolyte is measured at 1. 272 × 10^- 3 S/cm at 20 ℃ using A.C. impedance method. This modification method is cost-saving, harmless and easy to conduct.

关 键 词：聚偏氟乙烯-六氟丙烯 聚合物电解质 锂离子电池 化学改性 

分 类 号：TQ325[化学工程—合成树脂塑料工业]