Energy-Storage Performance of High-Entropy (NaBiBa)0.205 (SrCa)0.1925TiO3-La(Mg0.5Zr0.5)O3 Ceramic Under Moderate Electric Fields

With the global low-voltage power market expanding rapidly, lead-free dielectric ceramics exhibit excellent stability and environmental friendliness, but their strong field-dependence limits low-field applications. There is an urgent need to develop lead-free ceramic systems with outstanding energy-storage performance under modest electric fields to meet the rapidly expanding global low-voltage power market for bulk ceramics. In this study, high-entropy ceramics (1 − x%)(NaBiBa)0.205(SrCa)0.1925TiO3-x%La(Zr0.5Mg0.5)O3 (x = 0–8) were successfully prepared. The introduced La(Zr0.5Mg0.5)O3 not only dissolves well in the high-entropy elementary lattice but also effectively improves its relaxation characteristics. High-entropy ceramics show optimal energy-storage characteristics, as indicated by an excellent energy-storage density of 4.46 J/cm3 and an energy-storage efficiency of 94.55% at 318 kV/cm. Moreover, its power density is as high as 92.20 MV/cm3, and the discharge time t0.9 is only 145 ns.