The validity of Mn element on enhanced energy storage performance and fatigue resistance of Mn-doped 0.7Na0.5Bi0.5TiO3–0.3Sr0.7Bi0.2TiO3 lead-free ferroelectric ceramics (BNT–BST–xMn) is certified by doping. The effects of Mn modification on the dielectric behavior, ferroelectric, energy storage properties, and AC impedance are comprehensively investigated. It is found that the average grain size of the ceramics modified by Mn additions is reduced slightly. Moreover, the relaxor properties are evidently enhanced with the increased Mn content. The AC impedance spectra can even better clarify the dielectric response and relaxor behavior. The results suggest that both of the dielectric response and relaxor behavior are determined by defects especially concentration of the oxygen vacancy. The superior energy storage properties are realized at x = 0.05 with an energy storage density (Wrec) of 1.33 J/cm3 as well as energy storage efficiency (η) of 86.2% at 100 kV/cm, accompanied with a superior thermal stability. BNT–BST–5Mn ceramics can maintain a stable energy storage performance within 106 fatigue cycles, indicating an excellent fatigue resistance.

Mn元素对增强Mn掺杂的0.7Na 0.5 Bi 0.5 TiO 3 –0.3Sr 0.7 Bi 0.2 TiO 3无铅铁电陶瓷（BNT–BST– x）的储能性能和抗疲劳性的有效性Mn）通过掺杂证明。全面研究了锰改性对介电性能，铁电性能，储能性能和交流阻抗的影响。已经发现，通过添加Mn改性的陶瓷的平均晶粒尺寸略有减小。而且，随着Mn含量的增加，松弛性能明显提高。交流阻抗谱甚至可以更好地阐明介电响应和弛豫器行为。结果表明介电响应和弛豫器行为均由缺陷尤其是氧空位的浓度决定。在x = 0.05时实现了优异的储能性能，储能密度（W rec）为1.33 J / cm 3在100 kV / cm时的储能效率（η）为86.2％，并具有出色的热稳定性。BNT–BST–5Mn陶瓷可在10 6个疲劳循环内保持稳定的储能性能，这表明其具有出色的抗疲劳性。