Ultrahigh Energy Density of Polymer Nanocomposites Containing BaTiO₃@TiO₂ Nanofibers by Atomic‐Scale Interface Engineering

Abstract

Atomic-scale interface engineering in BaTiO3@TO2 nanofibers (TiO2 nano-fibers embedded with BaTiO3 nano-particles) leads to concurrent enhancement of electric displacement and breakdown strength in poly(vinylidene fluoride) (PVDF)-based nanocomposites. An ultrahigh energy density of ≈20 J cm(-3) is achieved with only 3 vol% nanofibers, which is by far the highest discharged energy density of PVDF-based nanocomposites.

Enhanced Energy Storage with Polar Vortices in Ferroelectric Nanocomposites

“…Figure 8(b) shows the caluculated energy storage efficiency with the increasing of the radius R, the energy efficiency decreases. However, the efficiency is over 95% at R = 57 nm, which is higher than that of PVDF/BTO@TO_nfs [1] 7.5% BST NWs/PVDF [8] the reported BaTiO 3 @SrTiO 3 ceramics (about 90%) [9].…”

“…The energy density of commercial dielectric capacitors is usually of the order of 1-2 J/cm 3 , far inferior to electrochemical capacitors (≈ 20 J/cm 3 ) [1]. The energy density of a dielectric material is essentially given by U= EdP , where E is the electric field and P is the polarization.…”

High Discharge Energy Density at Low Electric Field Using an Aligned Titanium Dioxide/Lead Zirconate Titanate Nanowire Array

“…A number of studies have reported ceramic/polymer nanocomposites with high energy density 6, 7. For example a discharge energy density of 20 J cm −3 at 646 kV mm −1 was reported for BaTiO 3 @TiO 2 core–shell fibers in a polyvinylidene fluoride polymer matrix (denoted as BaTiO 3 @TiO 2 /PVDF, where @ denotes a core–shell structure) 8. This was subsequently improved to 31.2 J cm −3 at 797.7 kV mm −1 for nanocomposites with large aspect ratio fibers as a result of their preferred orientation directions perpendicular to the external electric field 9.…”

Ni/Al2O3/epoxy high-k composites with ultralow nickel content towards high-performance dielectric applications

“…As an alternative, composite materials may be promising candidates for high-k applications. As we know, the dielectric properties of a composite will undergo signicant changes near its percolation threshold, [8][9][10][11] and numerous researches have conrmed that percolative composites are promising candidates for high-k materials with outstanding dielectric properties, such as tunable high permittivity, high dielectric strength, low loss, etc. Therefore, various strategies have been developed to obtain high-k according to percolation theory in composite materials, such as ferroelectric/polymer composites, [12][13][14] binary or ternary metal (or carbon)/polymer composites, [15][16][17] metal (or carbon)/ ceramic composites, etc.…”