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
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.
[1] KestingRE .SyntheticPolymericMembranes .SecondEdition[M].NewYork :JohnWileyandSons,1985.
[2 ] GuH ,HuangXJ ,ChengLQ ,etal.Preparationofseparatorforlighium_ionbattery[P].ChinaPatent :0 0 10 72 4 3.9.
[3] FongR ,SackenU ,DahnJR .Studiesoflithiuminterclationintocarbonsusingnon_aqueouselectrochemicalcells[J].J .Electrochem .Soc .,1990 ,137:2 0 0 9