Optimization in the energy storage properties of Bi0.5Na0.5TiO3–SrTiO3 ceramics by introducing Bi(Mg0.5Zr0.5)O3

Abstract As one of the important electronic components, the dielectric capacitors for energy storage applications have been extensively studied in recent years. Among various dielectric materials, the perovskite oxide Bi 0.5 Na 0.5 TiO 3 ‐based ceramics have become promising candidates due to their high polarization, dielectric tunability, environment‐friendly composition, and so forth. Herein, the relaxor ferroelectric ceramics of Bi 0.5 Na 0.5 TiO 3 –SrTiO 3 –Bi(Mg 0.5 Zr 0.5 )O 3 were prepared via solid‐state reaction method. The sample with optimal composition not only retains the high polarization by introducing Bi 3+ ions, but also achieves the reduced remanent polarization by enhancing relaxor behavior and the promoted electric breakdown strength by the grain size refinement. Accordingly, a high recoverable energy density of 8.3 J/cm 3 under 450 kV/cm and the superb charge/discharge properties (current density C D = 1200 A/cm 2 , power density P D = 150 MW/cm 3 , charge/discharge time t 0.9 = 0.15 µs) are achieved, revealing great prospect in energy storage applications.