The development of ferroelectric (FE) ceramics with high recoverable energy-storage density (W_rec) critically affects the miniaturization and integration of advanced pulse-power capacitors. However, most lead-free FE materials have the shortcomings of large remanent polarization and low dielectric breakdown strength. In this work, a strategy of composition control was implemented to improve the W_rec of lead-free ceramics. The effects of Li and Nb ion incorporation on the structure, dielectric, and ferroelectric properties of the highly insulating (Na_0.5Bi_0.5)TiO₃–BaTiO₃ (NBT–BT) ceramic was investigated. X-ray diffraction analysis of the samples revealed that the pure phase was isostructural to (Na_0.5Bi_0.5)TiO₃. Dielectric measurements exhibited two pronounced anomalies which shift a certain angle within the depolarization-temperature range. The effects of LiNbO₃ content on the breakdown characteristics and discharge energy storage of NBT–BT ceramics were investigated. An enhanced discharged energy density of 1.05 J/cm³, calculated from a hysteresis loop, was observed at x = 4 mol%. The improved structure also resulted in an increase of up to 61% in breakdown strength.

具有高可回收能量存储密度（W _rec）的铁电（FE）陶瓷的发展严重影响了先进脉冲功率电容器的小型化和集成化。然而，大多数无铅FE材料具有较大的剩余极化和较低的介电击穿强度的缺点。在这项工作中，实施了成分控制策略以改善无铅陶瓷的W _rec。Li和Nb离子的掺入对高绝缘（Na _0.5 Bi _0.5）TiO ₃ -BaTiO ₃的结构，介电和铁电性能的影响（NBT-BT）陶瓷进行了研究。样品的X射线衍射分析表明，纯相与（Na _0.5 Bi _0.5）TiO ₃是同构的。介电测量显示出两个明显的异常，它们在去极化温度范围内偏移了某个角度。研究了LiNbO ₃含量对NBT-BT陶瓷击穿特性和放电能量存储的影响。根据磁滞回线计算，在x  = 4 mol％时，观察到放电能量密度提高了1.05 J / cm ³。改进的结构还使击穿强度提高了61％。