High-performance dielectric capacitors are one of the key components of pulsed power systems. Recently, with the rapid development of new energy sources, achieving a large energy storage density and a high efficiency in relaxor ferroelectric ceramics becomes the focus of our research. However, owing to the low breakdown strength (), it is still a challenge to achieve high recoverable energy storage density () in (BiNa)SrTiO-based ceramics. The doping of Sm(MgZr)O can effectively increase the activation energy of the ceramics and reduce the oxygen vacancy concentration. Therefore, a giant of ∼6.2 J/cm and a high energy storage efficiency () of ∼82.4 % are realized in 0.88(BiNa)SrTiO-0.12Sm(MgZr)O ceramics at = 455 kV/cm. Besides, the ceramic also possesses a high current density of 611.5 A/cm, a high-power density of 55.0 MV/cm and the fast discharge rate near 10.0 ns. This strategy to improve the energy storage performance opens up a new and effective way for future research on lead-free energy storage ceramics.

中文翻译：

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通过增强局部异质性在(Bi0.5Na0.5)0.7Sr0.3TiO3基弛豫器中实现高储能性能

高性能介电电容器是脉冲功率系统的关键元件之一。近年来，随着新能源的快速发展，弛豫铁电陶瓷的大储能密度和高效率成为我们研究的重点。然而，由于击穿强度较低，在(BiNa)SrTiO基陶瓷中实现高可恢复能量存储密度仍然是一个挑战。 Sm(MgZr)O的掺杂可以有效提高陶瓷的活化能，降低氧空位浓度。因此，0.88(BiNa)SrTiO-0.12Sm(MgZr)O陶瓷在= 455 kV/cm时实现了~6.2 J/cm的巨能量和~82.4%的高储能效率()。此外，该陶瓷还具有611.5 A/cm的高电流密度、55.0 MV/cm的高功率密度和接近10.0 ns的快速放电倍率。这种提高储能性能的策略为未来无铅储能陶瓷的研究开辟了一条新的有效途径。