Designing dielectric materials with the tremendous energy storage density is fundamentally important for developing pulse power capacitors. An effective approach was proposed to favorably modify the dielectric energy storage properties ($ESP$) of Bi_0.5Na_0.5TiO₃ ceramics using CaTiO₃ incorporation. The dielectric breakdown strength was effectively enhanced, and simultaneously the relaxor behavior was optimized to lower the remnant polarization, which is resulted from the decreased grains size with the introduction of Ca²⁺ ion. Remarkably, at a CaTiO₃ doping level of 0.2, a 0.8Bi_0.5Na_0.5TiO₃-0.2CaTiO₃ (0.8BNT-0.2CT) ceramic obtained both high energy storage density ($W_{\text{total}}$) of ∼1.38 J/cm³ together with excellent efficiency ($\eta$) of ∼91.3%. Furthermore, an ultrafast discharge response speed ($t_{0.9}$) ∼ 94 ns was achieved in 0.8BNT-0.2CT ceramic, as well as tremendous current density ($C_{\mathrm{D}}$ ∼1520 A/cm²) and power density ($P_{\mathrm{D}}$ ∼115 MW/cm³). This study not only revealed the superior ESP mechanism as regards Bi_0.5Na_0.5TiO₃ based ceramics but also provided candidate materials in pulse power capacitor devices.

设计具有巨大能量存储密度的介电材料对于开发脉冲功率电容器至关重要。提出了一种有效的方法来有利地改变介电储能特性（$乙\mathrm{小号}磷$_{) 使用 CaTiO 3}掺入的 Bi _0.5 Na _0.5 TiO ₃陶瓷。介电击穿强度得到有效提高，同时弛豫行为得到优化，以降低剩余极化，这是由于引入 Ca ²⁺离子后晶粒尺寸减小所致。值得注意的是，在CaTiO ₃掺杂水平为0.2时，0.8Bi _0.5 Na _0.5 TiO ₃ -0.2CaTiO ₃ (0.8BNT-0.2CT)陶瓷获得了高储能密度($W_{\text{全部的}}$) 约 1.38 J/cm ³以及出色的效率 ($\eta$) 约为 91.3%。此外，超快的放电响应速度（${吨}_{0.9}$) ∼ 94 ns 在 0.8BNT-0.2CT 陶瓷中实现，以及巨大的电流密度 ($C_{\mathrm{D}}$∼1520 A/cm ² ) 和功率密度 (${磷}_{\mathrm{D}}$～115 MW/cm ³ )。该研究不仅揭示了Bi _0.5 Na _0.5 TiO ₃基陶瓷的优异ESP机制，而且为脉冲功率电容器器件提供了候选材料。