High-performance capacitors based on NaNbO₃ nanowires/poly(vinylidene fluoride) nanocomposites

Abstract

Nanocomposite films loaded with small NaNbO3 nanowires exhibit a high discharge energy density of 12.26 J cm−3 at 410 MV m−1, superior power density of 2.01 MW cm−3, and ultra-fast discharge speed of 146 ns.

Enhanced dielectric constant and energy density in a BaTiO3/polymer-matrix composite sponge

“…By using one-dimensional ceramic structures, i.e., nanowires (NWs) and nanofibers of BaTiO 3 (BT) 10 , Pb (Zr,Ti)O 3 (PZT) 11 , ZnO 12 , NaNbO 3 , etc. 13 , considerably improved (~15% to~50% of enhancement) dielectric constant and energy density compared with polymer/ceramic NPs composites are achieved. Vertical alignments of ceramic NWs in composites show further enhancements in dielectric performances 14,15 .…”

“…A relation between the fitting factor and the specific morphology is required to be built. At last, as for nanowire-based composites, studies show that enhanced electric displacement is arising from the high adjacent polarizations around NWs 13 , while the mechanism of enhanced electric displacement in interconnected filler-based composites is not clearly understood yet. Therefore, to design novel filler achitectures and composites with further enhanced performances and investigate inherent mechanisms in interconnected fillerbased composites will be of great significance.…”

Novel core–shell-structured ironbark-like TiO2 as fillers for excellent discharged energy density of nanocomposites

“…In the view of energy storage, E b is another key factor for dielectrics [1]. The representative E b values of the pure PVDF and x vol.% TO@TO/PVDF nanocomposite lms are investigated via the Weibull distribution ( Fig.…”

“…Polymer dielectrics have become one of the best candidates for dielectric capacitors because of the instant response ability, high power density, and exibility and easy processing [1][2][3]. The stored and released energy densities of dielectric capacitors are dependent on the polarization and depolarization of dielectrics, and thus the polarization and breakdown strength (E b ) are two determined effects on the energy storage performances of dielectrics [4,5].…”

“…For example, the perpendicular orientation of nanowires to electric elds is contributed to decreasing local electric elds and enhancing E b of nanocomposites; While the parallel distribution of nanowires leads to a more concentrated electric eld, and thus reduces the E b of nanocomposites [5,9]. For example, Pan et al introducing low fraction NaNbO 3 nanowires into PVDF matrix greatly enhances the E b of PVDF-based nanocomposites, which is mainly induced by the ordered traps and the enhanced path tortuosity of electric tree growing [1]. Moreover, because of the smaller speci c surface area and surface energy of nanowires and nanosheets than that of nanoparticles, the signi cantly decreased nanowire agglomeration and other defects are also contributed to enhancing E b of nanowire-lled nanocomposites [7].…”