Enhanced dielectric properties of BaTiO3/poly(vinylidene fluoride) nanocomposites for energy storage applications

Abstract

In this work, homogeneous ceramics-polymer nanocomposites consisting of surface treated BaTiO3 (BT) particles as fillers and poly(vinylidene fluoride) polymer as matrix have been prepared using a solution casting process. The nanocomposites exhibit enhanced dielectric permittivity and reduced loss tangent. The frequency and temperature dependencies of the dielectric permittivity and loss tangent of the nanocomposites suggest that the introduced BT phase and interface areas contribute to the improvement of the dielectric responses. Meanwhile, the X-ray diffraction patterns and Differential Scanning Calorimetry (DSC) curves indicate that the incorporation of ceramic particles contributes to the decrease of the crystallite size, the increase of the crystallinity, and the shift of the crystallization temperature of the polymer matrix. Furthermore, the dielectric displacement and energy density of the nanocomposites are significantly enhanced and an energy density of 3.54 J/cm3 was obtained under an electric field of 200 MV/m with the BT concentration of 20 vol. %. The results indicate that the introduced ceramic fillers and interface areas have positive influences on the structure of the polymer matrix and contribute to the enhancement of the dielectric responses and energy storage properties of the nanocomposites.

BaTiO3–P(VDF-TrFE) composite ink properties for printed decoupling capacitors

“…The printed composite showed higher relative permittivity than has been previously reported with the same loading level, while the dielectric losses remain at the same level [8][9][10][11][12][13][14][15]. This is almost certainly due to the selection of the matrix material and the particle size, and the new fabrication technique including chemical solution processing with specific surfactant and printing which enabled a low agglomeration level and a more uniform distribution of the filler.…”

Dielectric spectroscopy of high aspect ratio graphene-polyurethane nanocomposites

“…[12] However, a high ceramic filler loading (beyond 50% vol) is required to considerably increase the dielectric constant. [13] Also, with the increase of filler loading, the mechanical characteristics of the nanocomposites suffer a decline. The last few years have seen a revival in the study of polymers reinforced by twodimensional fillers, especially graphene due to its exceptionally high modulus (Y ≈ 1 TPa) and strength (σ B ≈ 130 GPa).…”

Improvement of insulation effectiveness of natural rubber by adding hydroxyl-functionalized barium titanate nanoparticles

“…Surface modification of the nanoparticle fillers produces a surface coating layer that increases the electric field strength at breakdown and lowers the dielectric loss [22]. Yu et al [23] reported that the addition of surface modified BaTiO 3 particles in poly(vinylidene fluoride) enhances the dielectric properties and reduces dielectric loss, even at high filler loading. Choudhury [11] stated that the addition of active hydroxyl -OH groups on the surface of the BaTiO 3 particles produces a more uniform dispersion of the nanoparticles in a polyetherimide matrix, thus increasing the low-frequency dielectric permittivity and decreasing dielectric loss.…”