Enhanced energy storage property in Bi <sub>0.5</sub> Na <sub>0.5</sub> TiO <sub>3</sub> ‐based ceramics by composition modulation and grain refinement
Wen Zhou, Yangyang Zhang, Yifei Zhang, Xinhui Yang, Xian Zhang, Qingfeng Zhang, Shenglin Jiang, Guangzu Zhang, Yong Chen, Meng Shen
Abstract
Abstract High energy density ( W rec ) dielectrics with excellent efficiency ( η ) and thermal stability are crucial in high‐power energy storage applications. In this work, we introduce Ba(Zr 0.2 Ti 0.8 )O 3 (BZT) into Bi 0.5 Na 0.5 TiO 3 (BNT) to delay saturation polarization and refine grain sizes for enhancing energy storage performance. BZT diffusing into BNT lattice not only increases electronegativity between A‒O/B‒O bond and the relaxor, but also is beneficial for refining grain sizes and suppressing the development of local electric branches. Therefore, high P max with moderate P r and improved breakdown strength is achieved in BNT‒ x BZT ceramics with x = 0.6 mol. Additionally, BNT‒0.60BZT ceramics demonstrate enhanced recoverable energy storage density of 4.1 J cm −3 with high energy storage efficiency of 91%, along with favorable overdamped charge‒discharge properties including a maximum current, discharge energy density, and discharge time of 10 A, 2.4 J cm −3 , and 150 ns, respectively.