Bi_0.5Na_0.5TiO₃ (BNT)-based ferroelectrics have received more and more attention due to their environment-friendliness and large maximum polarization. Herein, the enhanced energy-storage properties of BNT-based ceramics were successfully prepared by introducing multi-ions (La³⁺, K⁺, Al³⁺, Nb⁵⁺, Zr⁴⁺) to improve the breakdown strength and simultaneously suppress the remnant polarization. An excellent discharge energy-storage density (W_d) of 3.24 J cm⁻³ and a high energy-storage efficiency (η) of 82 % under 200 kV cm^-1 have been recorded for Bi_0.44La_0.06(Na_0.82K_0.18)_0.5Ti_0.90(Al_0.5Nb_0.5)_0.08Zr_0.02O₃ ceramic. Meanwhile, the outstanding thermal stability with W_d of 1.84–1.96 J·cm⁻³ were also achieved in 25−125 °C at 140 kV cm^-1. More importantly, piezoresponse force microscopy reveals that the threshold voltage for inducing long range order enhances while the stability of polar nanoregions (PNRs) on the nanoscale decreased with the increase of La doping amount, leading to more linear polarization behavior and higher energy-storage properties. These results promote the practical applications of BNT-based ferroelectrics in advanced pulsed power systems.

基于Bi _0.5 Na _0.5 TiO ₃（BNT）的铁电材料由于其环境友好性和最大极化率而受到越来越多的关注。在此，通过引入多离子（La ³⁺，K ⁺，Al ³⁺，Nb ⁵⁺，Zr ⁴⁺）成功地制备了增强BNT基陶瓷储能性能的方法，以提高击穿强度并同时抑制BNT基陶瓷的储能性能。剩余极化。在200 kV cm ^-1下，极好的放电储能密度（W _d）为3.24 J cm ^-3，储能效率（η）为82％已经记录了Bi _0.44 La _0.06（Na _0.82 K _0.18）_0.5 Ti _0.90（Al _0.5 Nb _0.5）_0.08 Zr _0.02 O ₃陶瓷。同时，在25-125°C和140 kV cm ^{-1的条件下}，W _d为1.84–1.96 J·cm ^-3，具有出色的热稳定性。。更重要的是，压电响应力显微镜显示，随着La掺杂量的增加，用于诱导长程有序的阈值电压增加，而纳米级极性纳米区域（PNR）的稳定性降低，从而导致更多的线性极化行为和更高的储能性能。这些结果促进了基于BNT的铁电体在先进脉冲电源系统中的实际应用。