Structurally Regulated Design Strategy of Bi0.5Na0.5TiO3-Based Ceramics for High Energy-Storage Performance at a Low Electric Field

Dielectric ceramic capacitors are prospective energy-storage devices for pulsed-power systems owing to their ultrafast charge-discharge speed. However, low energy-storage density makes them difficult to commercialize for high-pulse-power technology applications. Herein, we presented a structurally regulated design strategy to disrupt a long-range ferroelectric order, refined grains, and eventually achieve excellent comprehensive energy-storage performance in (1 - x) (0.7Bi(0.5)Na(0.5)TiO(3)-0.3SrTiO(3))-x Sm(Zn2/3Nb1/3)O-3 eco-friendly ceramics. A large W-rec of similar to 7.43 +/- 0.05 J/cm(3) and a high eta of similar to 85 +/- 0.5% of 0.96 (0.7Bi(0.5)Na(0.5)TiO(3)-0.3SrTiO(3))-0.04 Sm(Zn2/3Nb1/3)O-3 were obtained at a low electric field of 290 kV cm(-1) with good energy-storage temperature (25-120 degrees C), frequency (1-100 Hz) stability, and charge-discharge properties (P-D similar to 74 +/- 1 MW/cm(3) and tau(0.9) similar to 159 +/- 2 ns). This strategy inspires rational structurally regulated designs and aims to promote the development of eco-friendly 0.7Bi(0.5)Na(0.5)TiO(3)-based ceramics with excellent energy-storage characteristics.