纳米Al_2O_3填充的PVDF-HFP复合电解质的导电性

Ionic Conductivity Study of PVF-HFP Composite Electrolyte Filled with Al_2O_3 Nanoparticles

用真空蒸发法制备了不同配方的 PVDF-HFP复合电解质膜 ,通过交流阻抗测试 ,优选出机械和电化学性能较好的 PVDF-HFP复合电解质的工艺参数 ,m (纳米 Al2 O3 )∶ m (增塑剂 DBP)∶ m ( PVDF-HFP) =1 0∶ 45∶ 45 .用丙酮抽提制得的 PVDF-HFP聚合物膜中的增塑剂 ,再于 1 mol/L Li PF6/DEC-EC(体积比1∶ 1 )的液态电解质中浸渍 ,浸渍后聚合物膜的电导率达到 1 0 -3 S/cm数量级 .

When nanoparticles of Al 2O 3 are used to fill in PVDF-HFP copolymer, the crystallinity of the polymer decreases and amorphous phase content in it increases due to the combination of nanoparticles with polar groups in the polymer matrix. As a result, the ionic conductivity of the PVDF-HFP composite electrolyte rises up. A series of composite polymer membranes(CPM) were prepared with various recipes by means of vacuum evaporation. From those prescriptions the weight proportion, m(Al 2O 3)∶m[plasticizer DBP(dibutyl phthalate)]∶m(PVDF-HFP)=10∶45∶45, is optimal on the basis of testing the bulk resistance of CPM by AC impedance technology. The ionic conductivity of the composite polymer electrolyte reaches 10 -3 S/cm after impregnating CPM in 1.0 mol/L LiPF 6/ EC-DEC(volume ratio 1∶1) liquid electrolyte. Prior to impregnating, the plasticizer DBP was extracted from CPM with acetone.