Structurally Regulated Design Strategy of Bi_0.5Na_0.5TiO₃-Based Ceramics for High Energy-Storage Performance at a Low...

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_0.5Na_0.5TiO₃-0.3SrTiO₃)-x Sm(Zn_2/3Nb_1/3)O₃ eco-friendly ceramics. A large W_rec of ∼7.43 ± 0.05 J/cm³ and a high η of ∼85 ± 0.5% of 0.96 (0.7Bi_0.5Na_0.5TiO₃-0.3SrTiO₃)-0.04 Sm(Zn_2/3Nb_1/3)O₃ were obtained at a low electric field of 290 kV cm^-1 with good energy-storage temperature (25-120 °C), frequency (1-100 Hz) stability, and charge-discharge properties (P_D ∼ 74 ± 1 MW/cm³ and τ_0.9 ∼ 159 ± 2 ns). This strategy inspires rational structurally regulated designs and aims to promote the development of eco-friendly 0.7Bi_0.5Na_0.5TiO₃-based ceramics with excellent energy-storage characteristics.