Optimization in the energy storage properties of Bi_0.5Na_0.5TiO₃-SrTiO₃ ceramics by introducing Bi(Mg_0.5Zr_0.5)O₃

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 Bi0.5Na0.5TiO3-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 Bi0.5Na0.5TiO3-SrTiO3-Bi(Mg0.5Zr0.5)O-3 were prepared via solid-state reaction method. The sample with optimal composition not only retains the high polarization by introducing Bi3+ 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 mu s) are achieved, revealing great prospect in energy storage applications.