High energy storage density of poly(vinylidene fluoride) bulk nanocomposites at low electric field induced by giant dielectric constant ceramic nanopowders

摘要

Ba(Fe0.5Ta0.5)O-3/poly(vinylidene fluoride) (BFT/PVDF) bulk nanocomposites are fabricated via a physical mixing method followed by heat treatment. The BFT particles in nanocomposites exhibit excellent dispersion and compatibility. The enhanced dielectric constant and loss have been obtained, which is attributed to the giant dielectric constant of BFT and the enhanced interfacial polarization. An energy storage density up to 2.18 J/cm(3) is achieved in the nanocomposites with BFT filler content of 2 vol% at a low electric field of 500 kV/cm. This value of energy storage density at low electric field is much higher than other polymer-based bulk nano composites. It is believed that the study may provide a new direction to enhance the energy storage density of ceramic/polymer nanocomposites.