Synergic Enhancement of Energy Storage Density and Efficiency in MnO₂-Doped AgNbO₃@SiO₂ Ceramics via A/B-Site Substitutions

Abstract

Dielectric energy storage devices with high power density show great potential in applications of smart grids, electrical vehicles, pulsed power weapons, and so on. However, their limited recoverable energy density badly restricts their utilization and harms the miniaturization, portability, and integration of electronics. Herein, equivalent amounts of Bi 2 O 3 and Sc 2 O 3 were introduced to improve the energy storage property of 0.10 wt % MnO 2 -doped AgNbO 3 @SiO 2 ceramics by simultaneously enhancing the maximum polarization, breakdown strength, and relaxation feature. It is particularly interesting that the AgNbO 3 -based ceramics with 4 mol % Bi 2 O 3 and Sc 2 O 3 demonstrate the recoverable energy storage density of 5.9 J/cm 3 with the energy storage efficiency of 71%, exhibiting 1.9 and 1.4 times enhancement compared to 0.10 wt % MnO 2 -doped AgNbO 3 @SiO 2 ceramics. In addition, the benign energy storage performance can be maintained at elevated temperatures and frequencies and up to 10 5 cycling, indicating great potential in advanced high-power applications.

Ultrahigh Energy Storage Density and High Efficiency in Lead-Free (Bi0.9Na0.1)(Fe0.8Ti0.2)O3-Modified NaNbO3 Ceramics via Stabilizing the Antiferroelectric Phase and Enhancing Relaxor Behavior

“…So as to elevate the energy storage properties of this work, we summarized a comparison of W rec and η between 0.88NN-0.12BNFT ceramic and recently reported NaNbO 3 -, AgNbO 3 - and PbZrO 3 -based antiferroelectric ceramics in Figure d. − ,,− ,,,− Two important features should be noted. First, the η of typical antiferroelectric ceramics is generally low (<80%) because of the antiferroelectric-ferroelectric phase transition induced large hysteresis.…”

High Energy Storage Performance in La-Doped AgNbO3 Ceramics via Tape Casting

“…(b) W rec and η of (Ag 1–3 x La x )NbO 3 ceramics. (c) W rec of reported AgNbO 3 -based ceramics at room temperature. − ,− (d) W rec of reported AgNbO 3 -based ceramics at wide operating temperature. − ,,,, …”

“…The W rec of 6.0 J/cm obtained at a temperature range of 20−150 °C in the (Ag 0.91 La 0.03 )NbO 3 ceramic is superior to those achieved in other AgNbO 3 -based ceramics. [16][17][18]30,34,35,38 A slight decrease in W rec with temperature is attributed to a decrease in P max caused by the M 2 −M 3 phase transition. This occurred because the M 3 phase has strong AFE stability, which will be discussed in the following section.…”

“…(c) W rec of reported AgNbO 3 -based ceramics at room temperature. 14−19,27−37 (d) W rec of reported AgNbO 3 -based ceramics at wide operating temperature [16][17][18]30,34,35,38.…”

Enhanced Energy Density and Efficiency in Lead‐Free Sodium Niobate‐Based Relaxor Antiferroelectric Ceramics for Electrostatic Energy Storage Application

“…ferroelectric (AFE-FE) phase transition, bringing about the ultrahigh W rec . [10,14] Nevertheless, the large hysteresis triggered by AFE-FE phase transition indicates that much of stored energy will be dissipated as heat during discharging, leading to a relatively low η, [15][16][17] as shown in Figure 1. For example, Zhao et al investigated the Ta-modified AgNbO 3 ceramic, exhibiting W rec of 4.2 J cm −3 at 23 kV mm −1 with relatively low η of 69%.…”