Environmental-friendly relaxation ferroelectrics are anticipated as an excellent comprehensive energy storage performance materials due to their near-zero remnant polarization and slim hysteresis loop. Here, the relaxor ferroelectrics (1-x)Na_0.5Bi_0.5TiO₃-x(Sr_0.7La_0.2)(Ti_0.8Sn_0.2)O₃ ((1-x)NBT-xSLTS) ceramics with outstanding energy storage performances are synthesized by solid-state reaction. The dielectric properties exhibit obvious frequency dispersion characteristics, and the diffusion coefficient (γ) increases from 1.62 to 1.75 with the doping of SLTS. Also, a large polarization difference (∆P = 20.08 μC/cm²) and a high breakdown strength (E_b = 280 kV/cm) are also achieved simultaneously. As a result, a high recoverable energy density W_rec (~ 2.52 J/cm³), together with a satisfactory efficiency η (~ 89.3%), are attained in 0.55NBT-0.45SLTS ceramic. Additionally, the corresponding samples also show satisfactory stability over the wide temperature range of 20–140 °C, with the variables of W_rec and η are less than 7% and 2%, respectively. More importantly, this ceramic has an ultrashort discharge time τ_0.9 (53 ns) and a high current density J (721.86 A/cm²). All these results reveal that 0.55NBT-0.45SLTS ceramic is an ideal lead-free next-generation candidate material for pulsed power systems.

环境友好的弛豫铁电体由于其接近零的剩余极化和细长的磁滞回线，有望成为一种优异的综合储能性能材料。这里，具有优异储能性能的弛豫铁电体 (1- x )Na _0.5 Bi _0.5 TiO ₃ - x (Sr _0.7 La _0.2 )(Ti _0.8 Sn _0.2 )O ₃ ((1- x )NBT- x SLTS)陶瓷是固相反应合成。介电特性表现出明显的频率色散特性，扩散系数（γ)随着 SLTS 的掺杂从 1.62 增加到 1.75。此外，还同时实现了大极化差异 (Δ P  = 20.08 μC/cm ² ) 和高击穿强度 ( E _b = 280 kV/cm)。结果，在 0.55NBT-0.45SLTS 陶瓷中获得了高可恢复能量密度W _rec (~ 2.52 J/cm ³ )，以及令人满意的效率η (~ 89.3%)。此外，相应的样品在 20–140 °C 的宽温度范围内也表现出令人满意的稳定性，变量W _rec和η分别低于 7% 和 2%。更重要的是，这种陶瓷具有超短放电时间τ _0.9 (53 ns) 和高电流密度J (721.86 A/cm ² )。所有这些结果表明，0.55NBT-0.45SLTS 陶瓷是脉冲电源系统的理想无铅下一代候选材料。