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电化学(中英文) ›› 2001, Vol. 7 ›› Issue (2): 234-237. 

• 研究论文 • 上一篇    下一篇

锂离子二次电池用隔膜的制备及其性质

任旭梅,吴锋,吴川,李汉军,黄学杰   

  1. 北京理工大学化工与材料学院!北京100081,北京理工大学化工与材料学院!北京100081,北京理工大学化工与材料学院!北京100081,北京理工大学化工与材料学院!北京100081,中国科学院物理研究所固态离子实验室!北京100080
  • 收稿日期:2001-05-28 修回日期:2001-05-28 出版日期:2001-05-28 发布日期:2001-05-28

Preparation and Properties of Separator for Lithium-ion battery

REN Xu_mei 1,WU Feng 1,WU Chuan 1,LI Han_jun 1,HUANG Xue_jie 2   

  1. (1.School of Chem. Engin. and Materials Sci.,Beijing Inst. of Techn.,Beijing 100081,China; 2.Lab. for Solid State Ionics,Inst. of Phys.,Chinese Acad. of Scie.,Beijing 100080,China
  • Received:2001-05-28 Revised:2001-05-28 Published:2001-05-28 Online:2001-05-28

摘要: 本文采用倒相法制备了锂离子二次电池用的PVDF HFP共聚物型多孔聚合物隔膜 ,该聚合物膜具有良好的机械性能 ,其孔隙率可达 75% ,吸附电解液后增重 4 50 % ,电导率为 10 - 3S/cm ,组装成电池后表现出良好的循环性能和较低的极化率

关键词: 隔膜, 锂离子电池, 倒相法

Abstract: Lithium_ion batteries are well adapted to the new multimedia applications. PP/PE based microporous film is commonly used as separator in commercial lithium ion batteries. Here we report a microporous film which is superior to the commercial available separator. The microporous PVDF polymer separators were prepared by the phase inversion process. The pore size of the separator is  7 μm, and it's porosity is 75%. The membrane in LiPF 6 EC/DEC showed high ionic conductivity (above 10 -3 S/cm at room temperature), and good mechanical properties (10 3 kg/cm 2). The half_cells consisted of Li/PVDF separator/MCMB showed excellent cycling characteristics and the stable discharge capacity is 302 mAh/g.

Key words: Separator, Lithium ion battery, PVDF, Phase inverse

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