The high-performance energy-storage dielectric capacitors are increasingly important due to their wide applications in high power electronics.Here,we fabricated a novel P(VDF-HFP)-based capacitor with surface-modified...The high-performance energy-storage dielectric capacitors are increasingly important due to their wide applications in high power electronics.Here,we fabricated a novel P(VDF-HFP)-based capacitor with surface-modified NBT-xST(x?0,0.10,0.26)whiskers,denoted as Dop@NBT-xST/P(VDF-HFP).The influences of ST content,fillers’volume fraction and electric field on the dielectric properties and energy-storage performance of the composites were investigated systematically.The results show that the dielectric constant monotonously increased with the increase of ST content and fillers’volume fraction.The composite containing 10.0 vol%NBT-0.26STwhiskers possessed a dielectric constant of 39 at 1 kHz,which was 5.6 times higher than that of pure P(VDF-HFP).It was noticed that the D-E loops of the composites became thinner and thinner with the increase of ST content.Due to the reduced remnant polarization,the composite with 5.0 vol%NBT-0.26STwhiskers achieved a high energy density of 6.18 J/cm3 and energy efficiency of approximately 57%at a relatively low electric field of 200 kV/mm.This work indicated that NBT-0.26ST whisker is a kind of potential ceramic filler in fabricating the dielectric capacitor with high discharged energy density and energy efficiency.展开更多
基金supported by the National Natural Science Foundation of China(No.51672311)China Postdoctoral Science Foundation(No.2017M620353)+1 种基金Science and Technology Project of Hunan Province,China(No.2016WK2022)supported by State Key Laboratory of Powder Metallurgy,Central South University,Changsha,China.
文摘The high-performance energy-storage dielectric capacitors are increasingly important due to their wide applications in high power electronics.Here,we fabricated a novel P(VDF-HFP)-based capacitor with surface-modified NBT-xST(x?0,0.10,0.26)whiskers,denoted as Dop@NBT-xST/P(VDF-HFP).The influences of ST content,fillers’volume fraction and electric field on the dielectric properties and energy-storage performance of the composites were investigated systematically.The results show that the dielectric constant monotonously increased with the increase of ST content and fillers’volume fraction.The composite containing 10.0 vol%NBT-0.26STwhiskers possessed a dielectric constant of 39 at 1 kHz,which was 5.6 times higher than that of pure P(VDF-HFP).It was noticed that the D-E loops of the composites became thinner and thinner with the increase of ST content.Due to the reduced remnant polarization,the composite with 5.0 vol%NBT-0.26STwhiskers achieved a high energy density of 6.18 J/cm3 and energy efficiency of approximately 57%at a relatively low electric field of 200 kV/mm.This work indicated that NBT-0.26ST whisker is a kind of potential ceramic filler in fabricating the dielectric capacitor with high discharged energy density and energy efficiency.
