Lead-free ceramic capacitors play an important role in electrical energy storage devices because of their ultrafast charge/discharge rates and high power density. However, simultaneously obtaining large energy storage capability, high efficiency and superior temperature stability has been a huge challenge for practical applications of ceramic capacitors. Here, the relaxor ferroelectric (1-x)[0.8Bi_0.5Na_0.5TiO₃-0.2Ba(Zr_0.3Ti_0.7)O₃]-xSr_0.7La_0.2TiO₃ ((1-x)(BNT-BZT)-xSLT) ceramics are prepared through solid-state reaction method to obtain excellent comprehensive energy storage performances. Particularly, high recoverable energy density (W_rec ∼ 2.6 J/cm³) as well as superior efficiency (η ∼ 92.2 %) can be achieved simultaneously under 210 kV/cm with composition of x = 0.3. Meanwhile, the corresponding ceramic shows excellent temperature (20−140 °C), frequency (1−200 Hz) and cycle stabilities (10⁶ st). Additionally, the 0.7(BNT-BZT)-0.3SLT ceramic also displays high power density (P_D ∼ 38.8 MW/cm³) and extremely short discharge time (τ_0.9 ∼ 0.11 μs). Therefore, this study provides a useful guideline for designing novel BNT-based ceramics with superior comprehensive energy storage performances.

无铅陶瓷电容器具有超快的充电/放电速度和高功率密度，因此在电能存储设备中起着重要的作用。然而，对于陶瓷电容器的实际应用而言，同时获得大的能量存储能力，高效率和优异的温度稳定性一直是巨大的挑战。此处，弛豫铁电体（1- x）[0.8Bi _0.5 Na _0.5 TiO ₃ -0.2Ba（Zr _0.3 Ti _0.7）O ₃ ] -x Sr _0.7 La _0.2 TiO ₃（（1 - x）（BNT-BZT）- XSLT）陶瓷是通过固态反应方法制备的，具有出色的综合储能性能。特别是，高可回收能量密度（w ^ _REC〜2.6焦耳/厘米³），以及优异的效率（η〜92.2％）可被同时下210千伏/厘米的带组合物获得X = 0.3。同时，相应的陶瓷表现出出色的温度（20-140°C），频率（1-200 Hz）和循环稳定性（10 ⁶ st）。此外，0.7（BNT-BZT）-0.3SLT陶瓷也显示高的功率密度（P _d〜38.8兆瓦/厘米³）和极短的放电时间（τ _0.9约0.11μs）。因此，本研究为设计新型具有优异综合储能性能的BNT基陶瓷提供了有用的指导。