Enhanced Energy Density and Efficiency in Lead‐Free Sodium Niobate‐Based Relaxor Antiferroelectric Ceramics for Electrostatic Energy Storage Application
Enhanced Energy Density and Efficiency in Lead‐Free Sodium Niobate‐Based Relaxor Antiferroelectric Ceramics for Electrostatic Energy Storage Application
复制标题
DOI：
10.1002/aelm.202200793
复制
发表时间：
2022-09
影响因子：
6.2
通讯作者：
Tianze Pan;Ji Zhang;Zhangbin Guan;Yiming Yan;Jiajun Ma;Xiongjie Li;Shun Guo;Jing Wang;Yaojin Wang
中科院分区：
文献类型：
--
作者：
Tianze Pan;Ji Zhang;Zhangbin Guan;Yiming Yan;Jiajun Ma;Xiongjie Li;Shun Guo;Jing Wang;Yaojin Wang
反铁电陶瓷因其大电场诱发极化而成为近年来静电储能的研究热点。无铅铌酸钠（NaNbO3）基陶瓷是新兴的反铁电陶瓷之一。然而，不稳定的反铁电相严重制约了能量密度和效率的进一步提高。在这项工作中，通过将具有较低容差因子和平均电负性的二元钙钛矿端元BiFeO3-BaTiO3引入NaNbO3陶瓷中，通过细长的双类极化电场（P-E）环和四峰电流-电场（I-E）曲线识别出具有改善弛豫特性的稳定反铁电相。同时，通过拉曼光谱、X射线衍射（XRD）图和介电性能验证了反铁电P到R相变。特别是，电击穿强度Eb的增强是通过超低介电损耗、减小晶粒尺寸等的协同贡献来实现的。因此，具有优化成分的样品表现出14.5 J cm−3的超高可恢复能量存储密度（Wrec）和83.9%的满意效率（η），这显示了最先进介电陶瓷的优越性。这些结果为通过调控反铁电结构与性能之间的关系探索用于静电储能应用的高性能电介质提供了一条可行的途径。
Antiferroelectric ceramics are recently, a research hotspot for electrostatic energy storage because of their large electric‐field induced polarization. Lead‐free sodium niobate (NaNbO3)‐based ceramics are one of the emerging antiferroelectric counterparts. However, the unstable antiferroelectric phase seriously restricts the further improvement of energy density and efficiency. In this work, by introducing binary perovskite end‐member BiFeO3–BaTiO3 with lower tolerance factor and average electronegativity into NaNbO3 ceramics, the stablized antiferroelectric phase with improved relaxation characteristic is identified by slim double‐like polarization‐electric field (P–E) loops and four‐peak current–electric field (I–E) curves. Meanwhile, the antiferroelectric P to R phase transition is verified through Raman spectra, X‐ray diffraction (XRD) patterns, and dielectric performance. In particular, the enhanced electric breakdown strength Eb is achieved by synergic contributions from ultralow dielectric loss, reduced grain size, and so on. Consequently, the sample with optimized composition displays ultrahigh recoverable energy storage density (Wrec) of 14.5 J cm−3 and satisfied efficiency (η) of 83.9%, which shows the superiority in the state‐of‐the‐art dielectric ceramics. These results provide a feasible route by regulating the relationship between antiferroelectric structure and properties to explore high‐performance dielectrics for electrostatic energy storage applications.