聚偏氟乙烯/多壁碳纳米管复合材料的储能特性研究

Study on energy storage characteristics of polyvinylidenefluoride/multi-walled carbon nanotube composites

为适应高储能密度聚合物基电介质等应用需求,通过喷雾干燥等手段对多壁碳纳米管(MWCNTs)进行预处理,并将其与聚偏氟乙烯-六氟丙烯(PVDF-HFP)物理混合,制备得到了PVDF-HFP/MWCNTs复合材料.采用SEM、SAXS、XRD和FTIR对复合材料的微观结构进行了表征,并对其介电特性和铁电特性进行了测试.结果发现:PVDF-HFP/MWCNTs复合材料的介电常数随MWCNTs填充量的增加而增大,当MWCNTs达到3 vol%时复合材料的介电常数可增加到32,与PVDF-HFP相比提升近3倍;通过铁电测试发现,当MWCNTs的含量为1.0 vol%时,复合材料在800 kV/cm下储能密度达到3.0 J/cm^3(PVDF-HFP在800 kV/cm下储能密度达2.3 J/cm^3).以上测试结果表明MWCNTs在较低填充下实现了对PVDF-HFP储能特性的改善,未来有望满足复合材料应用于介质电容器对提升储能密度的需求.

To increase the energy storage density of the polymer,MWCNTs,pretreated by using spray drying were chosen as fillers to modify the polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP).SEM,SAXS,FTIR and XRD were used to characterize the microstructure of the composites,the dielectric and ferroelectric properties of the composite were tested.The results show that the dielectric constant of PVDF-HFP/MWCNTs composite materials increases with the growing amount of MWCNTs.The dielectric constant reaches to 32 as MWCNTs content increased to 3 vol%,which is 3 times higher than the pure PVDF-HFP.Furthermore,the D-E loops of the composites were measured via the ferroelectric tests,the results show that the energy storage density of the composites at MWCNTs loading of 1 vol%is 3.0 J/cm^3 at 800 kV/cm(the energy storage density of PVDF-HFP is 2.3 J/cm^3 at 800 kV/cm).Results show that the introduction of proper content of MWCNTs could improve the energy storage characteristics of PVDF-HFP.This work is expected to open a new window in improving the energy storage properties of polymer-based materials.