Ultrahigh energy density and efficiency of BaTiO3-based ceramics via multiple design strategies

The market-dominating of electrostatic capacitors of BaTiO3 are essential in advanced power supply system due to their quickly store and release electrical energy. However, the relatively low energy storage capability im-pedes miniaturization and integration in present-day electronics. In this study, we investigate the addition of (Sr0.7Bi0.2)(Mg1/3Ta2/3)O3 (SBMT) as a dopant into 0.75BaTiO3-0.25Na0.5Bi0.5TiO3 (BT-NBT) to form a solid solution. SBMT effectively improve the relaxation behavior and insulation performance of the ceramic, increases the breakdown strength (Eb) and reducing hysteresis loss, this leads to a synergistic improvement in the energy storage density (Wrec) and efficiency (eta). The best performing composition was found to be 0.80(BT-NBT)-0.20SBMT, which produced a combination of Eb-720 kV/cm, Wrec-7.12 J/cm3, and eta-90%, These values are superior to those of BaTiO3 and other BaTiO3-based ferroelectric ceramics. Additionally, this composition exhibits almost fatigue-free Wrec after 104 switching cycles, even at elevated temperatures of up to 200 degrees C. These exceptional capabilities demonstrate significant potential for practical device applications.