Two-dimensional SrTiO3 platelets induced the improvement of energy storage performance in polymer composite films at low electric fields

Abstract 0-3 composites containing high permittivity ceramic particles and high breakdown strength polymer have aroused extensive concern for energy-storage application. In this research, flexible composite films were fabricated through incorporating of strontium titanate (SrTiO3) platelets (P-ST) and poly(vinylidene fluoride) (PVDF), and the effect of P-ST content on the dielectric and energy storage performances were researched systematically. It was found that at the relatively low electric field of 350 MV/m, the composite with 1 wt% P-ST exhibited an increased discharged energy density of 9.48 J/cm3, exceeding most of the current reports at the same electric field. And the distribution of local electric field and local polarization of composite films were simulated by COMSOL Multiphysics. This work provided a reference for polymer-based composite films featuring high energy storage property at relatively low applied electric field, which could reduce the possibility of failure for capacitors.