Environmentally friendly lead-free ceramics capacitors, with outstanding power density, rapid charging/discharging rate, and superior stability, have been receiving increasing attention of late for their ability to meet the critical requirements of pulsed power devices in low-consumption systems. However, the relatively low energy storage capability must be urgently overcome. Herein, this work reports on lead-free SrTi_0.875Nb_0.1O₃ (STN) replacement of (Bi_0.47La_0.03Na_0.5)_0.94Ba_0.06TiO₃ (BLNBT) ferroelectric ceramics with excellent energy storage performance. Improving relaxor behaviour and breakdown strength (E_b), decreasing grain size, and mitigating large polarization difference are conductive to the enhancement of comprehensive energy storage performances. The phase-field simulation methods are further analysized evolution process of electrical tree in the experimental breakdown. In particular, the 0.70BLNBT-0.30STN ceramic exhibit a large discharged energy density of 4.2 J/cm³ with an efficiency of 89.3% at room temperature under electric field of 380 kV/cm. Additionally, for practical applications, the BLNBT-based ceramics achieve a high power density (∼62.3 MW/cm³) and fast discharged time (∼148.8 ns) over broad temperature range (20–200 °C). Therefore, this work can provide a simple and effective guideline paradigm for acquiring high-performance dielectric materials in low-consumption systems operating in a wide range of temperatures and long-term operations.

环保无铅陶瓷电容器具有出色的功率密度、快速的充放电速率和卓越的稳定性，因其能够满足低功耗系统中脉冲功率器件的关键要求，近来受到越来越多的关注。然而，储能能力相对较低的问题亟待克服。在此，这项工作报告了无铅 SrTi _0.875 Nb _0.1 O ₃ (STN) 替代 (Bi _0.47 La _0.03 Na _0.5 ) _0.94 Ba _0.06 TiO ₃(BLNBT) 铁电陶瓷具有优异的储能性能。改善弛豫行为和击穿强度（E _b），减小晶粒尺寸，减轻大的极化差有利于提高综合储能性能。相场模拟方法进一步分析了实验击穿中电树的演化过程。特别是0.70BLNBT-0.30STN陶瓷在380 kV/cm的电场下，在室温下表现出4.2 J/cm ^{3的大放电能量密度和89.3%的效率。}此外，在实际应用中，基于 BLNBT 的陶瓷实现了高功率密度（~62.3 MW/cm ³）和在宽温度范围（20-200°C）内的快速放电时间（~148.8 ns）。因此，这项工作可以为在宽温度范围和长期运行的低消耗系统中获取高性能介电材料提供简单有效的指导范式。