Ultrahigh Polarization Response along Large Energy Storage Properties in BiFeO₃–BaTiO₃-Based Relaxor Ferroelectric Ceramics under Low Electric Field

Abstract

BiFeO 3 −BaTiO 3 (BF−BT) dielectric ceramics are receiving more and more concern for advanced energy storage devices owing to their excellent ferroelectric properties and environmental sustainability. However, the energy density and efficiency are limited in spite of the large remanent polarization. Herein, we proposed a multiscale optimization strategy via a local compositional disorder with a Birich content and nanodomain engineering by introducing the Sr 0.7 Bi 0.2 Ca 0.1 TiO 3 (SBCT) into BF−BT ceramics. Interestingly, an extraordinary energy storage property (ESP) with a high reversible energy storage density (W rec ) of ∼3.79 J/cm 3 and an ultrahigh polarization discrepancy (ΔP) of ∼58.5 μC/cm 2 were obtained in the SBCT-modified BF−BT ceramics under 160 kV/cm. The boosted ESP should be attributed to the fact that the replacement of A/B-sites cations could transform the long-range ferroelectric order of the BF−BT system into polar nanoregions (PNRs) along with the refined grain size, decreased leakage current, and broadened energy band gap. Moreover, good frequency (1−10 3 Hz) and temperature (25−125 °C) stabilities, high fatigue resistance (× 10 5 ), large power density (∼31.1 MW/cm 3 ), and fast discharge time (∼97 ns) were also observed for the optimized ceramics. These results illustrate a potentially effective method for creating high ESP lead-free ceramics at a low electric field.

Energy Storage and Charge/Discharge Performance of Sm-Doped NBT-Based Lead-Free Ceramics

“…This process leads to a gradual increase in the polarization value, P r , because the rearrangement of the lattice and the redistribution of charge are conducive to enhancing the polarization effect. Figure presents the E b of the NBSTS x ceramics . The Weibull distribution is typically used to calculate the intrinsic E b of ceramics …”

Prominent energy storage density and efficiency of Na0.5Bi0.5TiO3‐based ceramics via multiscale amelioration strategy

“…[36][37][38][39][40] Figure 4(A) shows the bandgap width of (1-x)NBLBT-xSANT ceramics, inset is UV-Vis absorbance spectra. The value of E g was fittted by the following formula 41,42 :…”

“…Figure 4(A) shows the bandgap width of (1‐ x )NBLBT‐ x SANT ceramics, inset is UV‐Vis absorbance spectra. The value of E g was fittted by the following formula 41,42 : $$$$\begin{equation}{{\mathrm{(\alpha }}hv{\mathrm{)}}}^{\mathrm{2}}{\mathrm{ = \ }}A{\mathrm{(}}hv{\mathrm{ - }}{E}_{\mathrm{g}}{\mathrm{)}},\end{equation}$$$$where α is absorbance coefficient, h is Planck constant, and ν is frequency. With the incorporation of SANT, the value of E g raises from 3.09 eV at x = 0 to 3.21 eV at x = 0.16, which indicates that electrons are difficult to jump from the valence band to the conduction band 28,34,43 .…”

Expediting ion migration and stabilizing interface deposition through pre-polarized ion channels for zinc-ion batteries

“…Furthermore, spontaneous polarization is an inherent property of ferroelectric materials, meaning that the material has a spontaneous electric dipole domain without an external electric eld. 42 When an external electric eld is applied to ferroelectric materials, this spontaneous electric dipole moment can reverse, resulting in a change in the material's polarization direction. The hysteresis loop demonstrates the relationship between the material's polarization and changes in the external electric eld.…”