Lead-free ceramic capacitors have the application prospect in the dielectric pulse power system due to the advantages of large dielectric constant, lower dielectric loss and good temperature stability. Nevertheless, most reported dielectric ceramics have limitation of realizing large energy storage density (W_rec) and high energy storage efficiency (η) simultaneously due to the low breakdown electric field (E_b), low maximum polarization and large remanent polarization (P_r). These issues above can be settled by raising the bulk resistivity of dielectric ceramics and optimizing domain structure. Therefore, we designed a new system by doping (Bi_0.5Na_0.5)_0.7Sr_0.3TiO₃ into 0.9NaNbO₃-0.1Bi(Ni_0.5Zr_0.5)O₃ ceramics, which simultaneously obtained a higher bulk resistivity by decreasing the grain size and achieved a smaller P_r by optimizing domain structure, thus the better E_b of 530 kV/cm and W_rec of 6.43 J/cm³ were achieved, η was improved from 34% to 82%. Besides, the 0.4BNST ceramics show excellent temperature, frequency and fatigue stability under the conditions of 20–180 °C, 1–100 Hz and 10⁴ cycles, respectively. Meanwhile, superior power density (P_D = 107 MW/cm³), large current density (C_D = 1070 A/cm²) and discharge speed (1.025 μs) were achieved in 0.4BNST ceramic. Finally, the charge-discharge performance displayed good temperature stability in the temperature range of 30 °C–180 °C. The above results indicated that the ceramics have potential practical value in the field of energy storage capacitor.

无铅陶瓷电容器具有介电常数大、介电损耗低、温度稳定性好等优点，在介质脉冲电源系统中具有应用前景。然而，由于低击穿电场（E _b）、低最大极化和大剩余极化（P _r），大多数报道的介电陶瓷在同时实现大能量存储密度（W _rec）和高能量存储效率（η ）方面存在局限性。 . 以上这些问题可以通过提高介电陶瓷的体电阻率和优化畴结构来解决。因此，我们设计了一种新的掺杂体系（Bi _0.5 Na _0.5) _0.7 Sr _0.3 TiO ₃转化为0.9NaNbO ₃ -0.1Bi(Ni _0.5 Zr _0.5 )O ₃陶瓷，同时通过减小晶粒尺寸获得更高的体电阻率，通过优化畴结构获得更小的P _{r ，从而获得更好的}E实现了 530 kV/cm 的_b和6.43 J/cm ^3的W _rec，η从 34% 提高到 82%。此外，0.4BNST陶瓷在20-180℃、1-100Hz和10 ^{4条件下表现出优异的温度、频率和疲劳稳定性。}循环，分别。同时， 0.4BNST陶瓷具有优异的功率密度（P _D  = 107 MW/cm ³）、大电流密度（C _D  = 1070 A/cm ^{2 ）和放电速度（1.025 μs）。}最后，充放电性能在30°C-180°C的温度范围内表现出良好的温度稳定性。上述结果表明，陶瓷在储能电容器领域具有潜在的实用价值。