High Energy Density of Polyvinylidene Fluoride-Based Composite Films Induced by Anisotropic PLZT Fillers

With the rapid development of electronic industry, high-energy storage density dielectric materials are urgently needed to meet electronic components equipment miniaturized demand. Polymer dielectric materials have the advantages of good flexibility and high breakdown field, however, the energy storage capacity of polymers is limited by its inherent low dielectric constant. To improve the dielectric constant and energy storage density of the polymer material, we synthesized 0D (zero dimension), 1D, 2D lanthanum modified lead zirconate titanate (PLZT) fillers which introduced into polyvinylidene fluoride (PVDF) matrix. The anisotropic of the fillers has obvious improvement on the properties of materials. Compared with 0D fillers, high anisotropic fillers are more effective in enhancing the dielectric performances and energy density of PVDF based composites. The high anisotropic ratios of 2D fillers limit the charge migration toward the electrodes and hold back the growing electric tree during breakdown. Consequently, high breakdown strength (430 MV/m) and high discharge energy density (13.9 J/cm³) for 2D PLZT/PVDF composite films were obtained. This work is of critical significance in making dielectric capacitors for energy storage devices and reveals the influence mechanism for different dimensions fillers on the dielectric and energy storage properties of PVDF based composites.