Effect of AgNbO₃ Morphology on Dielectric and Energy Storage Properties of Polyvinylidene Fluoride-Based Nanocomposites

Abstract

Introducing high dielectric constant ceramics into polymers can improve the dielectric constant and energy storage performance of composites without reducing the breakdown resistance of polymers. The remnant polarization of the antiferroelectric material is very small, and it has a high saturation polarization, which is beneficial to improving the energy storage density. In this study, three different microstructures of AgNbO3 particles, C-AN, S-AN, and H-AN, were prepared by the co-precipitation method, traditional solid phase method, and hydrothermal method, respectively. Among them, C-NPS is a nanometer powder and S-AN and H-AN are micron powders. The surface of the particles was modified with silane coupling agent KH560 to improve the compatibility of the inorganic–organic interface. Composite materials were prepared by the casting method. The results show that the C-AN nanoparticle has a large specific surface area, small particle size, and uniform size distribution and its dispersion in the PVDF (polyvinylidene fluoride) matrix is the best. The high saturation polarization of the antiferroelectric AgNbO3 filler under a high electric field can induce the composite to produce a high P max (maximum polarization) value and reduce P r (remanent polarization), thereby ultimately increasing the energy storage density of the nanocomposite. The energy storage density of the 0.3 wt % C-AN/PVDF composite is 6.03 J/cm3 under the electric field of 300 kV/mm.

Antiferroelectric AgNbO3@KH550 Doped PVDF/PMMA Composites with High Energy Storage Performance

“…The optimal addition amounts were determined as 0.3 wt% for the antiferroelectric filler AgNbO 3 and 30 wt% for PVDF. [49] The energy storage density of AgNbO 3 /PVDF/PMMA composites reached 14.35 J cm −3 under an electric field of 430 kV mm −1 .…”