Preparation and Storage Energy Density Base on Dielectric Properties of P(VDF-HFP)/PU/BNKT Thin Films

Abstract

Novel electrical devices based on energy storage capacitor and energy conversion, have developed to advanced dielectric properties including electrical performance.In this work, three phases composite of poly(vinylidene fluoride hexafluoropropylene) (P(VDF-HFP)) blended with polyurethane (PU) and filled with Bi0.5(Na0.8 -K0.2)0.5TiO3 (BNKT) ceramic was studied on the on the dielectric, electrical properties and a storage energy density. All composite thin films are fabricated by the tape casting method in solution. Polarization-Electrical (P-E) loop of all composite thin films were also investigated relaxor-ferroelectric characteristic with the various electric fields. The recoverable energy density and energy efficiency from the loop were then analysed. As a result, the three phases composite of P(VDF-HFP)/PU/BNKT composites produce the highest dielectric constant as well as conductivity; however, they produce the lowest energy efficiency in this work. It seems that the interfacial polarization is easy switchable dipole moment in three phases more than one phase, resulting in high dielectric constant as well as conductivity. However, the larger conductivity seemly generates larger dielectric loss, resulting in lower energy efficiency. Therefore, the comparison based on three and two phases can be used to predict in capability of electric capacitor devices in the future.