Improved dielectric properties and energy-storage densities of BaTiO₃-doped PVDF composites by heat treatment and surface modification of BaTiO₃

Abstract

The dielectric properties of barium titanate/polyvinylidene fluoride (BT/PVDF) composites are investigated. The doped BT particles are prepared by using simple heat treatment. It is found that 1000 ℃ is the optimal temperature for the doped BT particles to improve the dielectric properties of BT/PVDF composites. Besides, we also find that the breakdown strength of the BT/PVDF composites can be significantly enhanced when the surface of the doped BT particles are pre-modified with phthalic acid or KH550. In particular, the BT/PVDF composites doped with KH550 modified BT particles have the maximum energy storage density of 4.08 J/cm3, which is 81.33 % higher than that of BT/PVDF composites doped with BT particles and without any treatment. Therefore, we can conclude that heat treatment and surface modification of doped BT particles could become new approaches to enhance the energy storage performance of the BT/PVDF composites, which has a good application prospect in the field of dielectric energy storage materials.

Enhanced dielectric, energy storage, and actuated performance of TPU/BaTiO3 dielectric elastomer composites by thermal treatment

“…By thermal treatment of the composites, the compatibility between BT nanoparticles and PVDF matrix was improved and the void defects inside the composite material were eliminated, which significantly improved the dielectric properties and energy storage properties of the composites. Sang et al [39] prepared PVDF/BaTiO 3 composite energy storage materials. The interface polarization between BT and PVDF matrix was enhanced by high temperature heat treatment of doped BT nanoparticles and surface modification of BT nanoparticles with KH550.…”

Effect of Inorganic Nanoparticles on Energy‐Storage Properties of P(VDF–HFP)‐Based Nanocomposites

“…Figure 6 compares the BDS and energy-storage performance of representative polymer matrix composites in recent years. [16,[44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] As can be seen from the comparison in Figure 6, 0.7 vol% BNT-SST/P(VDF-HFP) nanocomposites has a higher electric field and energy-storage density, and the efficiency is up to 67.01%. In addition, 0.7 vol% BNT-SST/P(VDF-HFP) polymer matrix composites not only have excellent energy-storage performance but also have low raw material cost and relatively simple preparation process.…”

Remarkably enhancing dielectric permittivity and suppressing loss of PVDF via incorporating metal nanoparticles decorated glass fibers

“…many advanced power and electronic applications, including energy storage capacitors, 5G base stations and transmission cables [1][2][3][4]. Polymer dielectrics have been found to be widely attractive in recent years because of their selfhealing capability, high flexibility, low dielectric loss and high voltage resistance [5][6][7][8][9]. Unfortunately, compared with inorganic dielectrics, polymer dielectrics suffer relatively low permittivity (<10 at 1 kHz) due to the inherent low polarization of carbon-hydrogen covalent bonds, which greatly limit their practical applications [7].…”