Seeking for high energy storage materials has become an urgent task in the circumstance of energy crisis. In this work, a series of relaxor ferroelectrics (1-x)Bi_0.5Na_0.5TiO₃-xSr_0.7La_0.2TiO₃ ((1-x)BNT-xSLT) with excellent energy storage performance were successfully fabricated. The SLT as a second component was doped into BNT and served three main functions: (1) efficiently decreased the grain size and increased the band gap and thus enhanced the breakdown electric field, (2) drove the ferroelectric phase gradually to a relaxor character, (3) reduced the tolerance factor (t) to defer the electric field of polarization saturation. Eventually, we achieved an impressive recoverable energy storage density (W_rec) of 4.14 J/cm³ and an ultrahigh energy storage efficiency (ƞ) of 92.2% simultaneously at 315 kV/cm in the ceramic of x = 0.45. Furthermore, the sample also exhibited an excellent stability against testing temperature, frequency and cycle, a high power density (182 MW/cm³) and a fast discharge speed (123 ns), all of which are ideal characteristics for high power energy storage devices.

在能源危机的情况下，寻求高储能材料已成为当务之急。在这项工作中，一系列弛豫铁电体（1-x）Bi _0.5 Na _0.5 TiO ₃ -xSr _0.7 La _0.2 TiO ₃成功制造了具有出色储能性能的（（1-x）BNT-xSLT）。作为第二组分的SLT掺杂到BNT中，并具有三个主要功能：（1）有效地减小晶粒尺寸并增加带隙，从而增强击穿电场；（2）逐渐将铁电相驱动为弛豫特性， （3）减小容差因子（t）以延迟极化饱和电场。最终，我们实现了令人印象深刻的4.14 J / cm ^3的可回收能量存储密度（W _rec）在x = 0.45的陶瓷中，同时以315 kV / cm的超高能量存储效率（ƞ）达到92.2％。此外，样品还表现出对测试温度，频率和周期的出色稳定性，高功率密度（182 MW / cm ³）和快速放电速度（123 ns），所有这些都是高功率储能设备的理想特性。