Energy storage performance of BiFeO₃–SrTiO₃–BaTiO₃ relaxor ferroelectric ceramics

Abstract

Dielectric capacitors reveal great potential in the application of high power and/or pulsed power electronic devices owing to their ultrafast charge-discharge rate and ultrahigh power density. Among various dielectric capacitors, the environment-friendly lead-free dielectric ceramics have drawn extensive investigations in recent years. Nevertheless, the relatively small recoverable energy storage density (W rec ) is still an obstacle for their application. Herein, the (0.55−x)BiFeO 3 -0.45SrTiO 3 -xBaTiO 3 ternary ceramics with 0.1 wt% MnO 2 were prepared by the solid-state reaction, and achieved enhanced relaxor behavior as well as breakdown strength E b . As a result, the x = 0.12 ceramic exhibited superior comprehensive energy storage performance of large E b (50.4 kV/mm), ultrahigh W rec (7.3 J/cm 3 ), high efficiency η (86.3%), relatively fast charge-discharge speed (t 0.9 = 6.1 μs) and outstanding reliability under different frequency, fatigue, and temperature, indicating that the BiFeO 3 -based relaxor ferroelectric ceramics are prospective alternatives for electrostatic energy storage.

(Bi1/6Na1/6Ba1/6Sr1/6Ca1/6Pb1/6)TiO3-based high-entropy dielectric ceramics with ultrahigh recoverable energy density and high energy storage efficiency

“…The g value for normal ferroelectrics is 1 and that of ideal relaxors is 2. 21,32 The g obtained from the slope of the linear tting line increases with increasing x, further demonstrating the enhanced dielectric relaxation properties. The P-E loops depicted in Fig.…”

“…Moreover, the increasing T m with increasing frequencies, frequency dependence of ε r and tan δ , and diffuse phase transition can be found for each composition, indicating the enhanced dielectric relaxation properties due to the promoted entropy. 31 Particularly, the relaxor behavior of dielectrics is quantitatively confirmed by the modified Curie–Weiss law via formula: 23,32 where γ and C are defined as the diffusion factor and constant, respectively. The fitting results of ln(1/ ε r − 1/ ε m ) and ln( T − T m ) are shown in Fig.…”

Effect of BiFeO3 Doping and Annealing Temperature on the High‐Temperature Dielectric Relaxation Properties in BaTiO3–SrTiO3 Lead‐Free Ceramics

“…When x = 0.06 sample, there is a dielectric anomaly with frequency dispersion and diffuse phase transition, which are the typical features of the relaxor ferroelectrics. [ 27 ] Two features should be noted. First, the variation of ε becomes more obvious with increasing x , further confirming the enhanced relaxor properties.…”

Simultaneous achievement of ultrahigh energy storage density and high efficiency in BiFeO3-based relaxor ferroelectric ceramics via a highly disordered multicomponent design

“…† Fig. 5 compares the vital parameters for dielectric energy storage between the recently reported Bi 0.5 Na 0.5 TiO 3 (BNT)-, [29][30][31][32][33] BaTiO 3 (BT)-, 6,7,[34][35][36] (K 0.5 Na 0.5 )NbO 3 (KNN)-, 12,[37][38][39][40] BiFeO 3 (BFO)based 10,[13][14][15][16][17]24,27,41,42 relaxor ferroelectric ceramics and our case. The detailed composition, as well as the values of E test /E b , W rec and h are listed in Table S3.…”