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 – x BaTiO 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.