FREQUENCY-DEPENDENT DIELECTRIC CONSTANT AND LOSS TANGENT ANALYSIS OF BT: P(VDF-HFP) HIGH ENERGY DENSITY NANOCOMPOSITES

摘要

Nanodielectrics have become one of the emerging materials activated to play an important role in sustainable and clean energy production, energy transportation, energy storage, and end usage. Based on our recent research on frequency-dependent dielectric properties of BaTiO3 (BT) single domain, BT/Poly(Vinylidene fluride-co-hexafluoropropylene) high energy density nanodielectric composites have been investigated as a function of frequency and also the volume fraction of nanoparticles at room temperature by several theoretical models. The projected models combined with Debye type of dissipation and soft mode theory to obtain more precise frequency dependent dielectric spectrum of BT. Among the others, Lichtnecker model, Maxwell-Wagner model, and modified Kerner model were used to find the frequency dependent nanocomposites dielectric spectrum. A similar model of wiener upper bound was proposed for the dielectric loss tangent prediction with a wide frequency range. The predicted results are compared with the experimental results and explore the frequency dependent dielectric activities of the nanocomposite. This proposed model provides the essential information on dielectric properties of high energy density nanocomposites with a wide frequency range instead of trial-and-error strategy of experiments for the future development of energy storage devices.