The Film Materials With High Dielectric Constant And Low Dielectric Loss And Supercapacitors

With the rapid development of the information、electronic and electric power industry,especially the mobile electronic devices、the stationary power systems and hybrid electric vehicledevelopment urgently need a pulse power source,which can accumulate a large amount of energyand instantaneous release. That is the high energy density and power density of supercapacitors. Inrecent years, the study has focused on the preparation of dielectric materials of high energy storagedensity, in order to get the high-performance and large-capacity energy storage capacitor. The mainproblem in the research of high energy storage density dielectric materials is the finding of the lowloss and high dielectric polymer dielectric materials. Although much progress has been made in thepolymer dielectric modification, the improvement of polymer dielectric property has not achievedsatisfactory results. Furthermore, the processing technology of polymer materials itself will alsohave an important influence on the final properties of materials. In the paper, the dielectricproperties of polymer PVDF matrix composites were researched mainly by temperature field,stress field and magnetic field to improve and optimize the processing technology of materials andachieve the purpose of improving the macroscopic properties of the polymers. It was found thatwhen the filler volume fraction is higher than17%, rapid cooling (quenching) contributes to theformation of PVDF/ZnO composite material percolation network; the external pressure canpromote PVDF/Fe3O4composite seepage process, the maximum dielectric constant reached375(100Hz), increasing2.5times, and the loss is controlled in the range of0.5-0.8and during hightemperature annealing, the PVDF/Fe3O4composites were induced by magnetic field, the magneticpercolation phenomenon occurred in the low filler, the dielectric constant increased more than80.