Sr_0.7Bi_0.2TiO₃ with high relaxor behavior and energy storage efficiency (η) is expected to be applied in power energy storage capacitors. However, its energy storage density is limited by the relatively low dielectric breakdown strength (DBS). Herein, Sr_0.7Bi_0.2Ca_xTiO₃ (SBT-xC, x = 0 ∼ 0.15) was prepared to decrease the average grain size of Sr_0.7Bi_0.2TiO₃. This can effectively eliminate the oxygen vacancy and decrease the electrical conductivity and leakage current, which result in the enhanced DBS. Meanwhile, Ca doping increases the relaxor behavior and dielectric constant. When x = 0.1, the composition exhibits high DBS of 480.2 kV/cm and excellent energy storage properties, such as high energy storage density of 2.1 J/cm³ with high η of 97.6 % at 290 kV/cm, considerable thermal stability and great frequency stability. Moreover, SBT-0.1C shows high power density of 50.1 MW/cm³. These results suggest that SBT-0.1C is a potential candidate for high performance dielectric energy storage applications.

具有高的弛豫性能和储能效率（η）的Sr _0.7 Bi _0.2 TiO ₃有望用于功率储能电容器。但是，其能量存储密度受到相对较低的介电击穿强度（DBS）的限制。在此，准备Sr _0.7 Bi _0.2 Ca _x TiO ₃（SBT-xC，x ＝ 0〜0.15），以减小Sr _0.7 Bi _0.2 TiO ₃的平均粒径。。这可以有效消除氧空位并降低电导率和泄漏电流，从而提高DBS。同时，Ca掺杂增加了弛豫性能和介电常数。当x ＝ 0.1时，该组合物表现出高的DBS为480.2kV / cm和优异的储能性能，例如高的储能密度为2.1J / cm ³，在290kV / cm下具有高的η为97.6％，相当大的热稳定性和优异的储能性能。频率稳定性。此外，SBT-0.1C显示出50.1MW / cm ^3的高功率密度。这些结果表明，SBT-0.1C是高性能介电储能应用的潜在候选者。