Ultrahigh energy storage density in lead-free relaxor antiferroelectric ceramics via domain engineering
Ultrahigh energy storage density in lead-free relaxor antiferroelectric ceramics via domain engineering
复制标题
DOI：
10.1016/j.ensm.2021.09.018
复制
发表时间：
2021-09-27
影响因子：
20.4
通讯作者：
Zhang, Shan-Tao
中科院分区：
文献类型：
--
作者：
Jiang, Jie;Meng, Xiangjun;Zhang, Shan-Tao
介质电容器因其在未来大功率和/或脉冲电力电子系统中的广泛应用而受到越来越多的关注。然而，目前介电陶瓷的可回收储能密度（W-rec）相对较低，这在很大程度上制约了其实际应用。本文采用畴工程的方法，构建了集反铁电体和弛豫体优点于一体的弛豫反铁电体NaNbO3-BiFeO3块体陶瓷。结果表明，反铁电相由正交P相转变为R相，反铁电畴由微米级块演变为纳米级团簇。特别重要的是，0.90NaNbO(3)-0.10BiFeO(3)陶瓷具有18.5 J cm（-3）的超高W-rec和99.5 kV mm（-1）的巨大电击穿强度，优于最先进的大块介电陶瓷。此外，0.90NaNbO(3)-0.10BiFeO(3)陶瓷具有优异的频率、循环和热可靠性，以及可观的电流密度（2140.6 A cm(-2)）、超高的功率密度（428.1 MW cm(-3)）和超快的放电速率（14 ns）。这些结果不仅表明基于nanbo3的弛豫反铁电陶瓷是先进储能电容器的有希望的候选材料，而且为开发新型无铅高性能介电材料提供了可行的领域工程策略。
Dielectric capacitors have drawn growing attention for their wide application in future high power and/or pulsed power electronic systems. However, the recoverable energy storage density (W-rec) for dielectric ceramics is relatively low up to now, which largely restricts their actual application. Herein, the domain engineering is employed to construct relaxor antiferroelectric NaNbO3-BiFeO3 bulk ceramics, which integrates the merits of antiferroelectrics and relaxors. It is revealed that the antiferroelectric phase transforms from orthorhombic P to R phase, and antiferroelectric domain evolves from micron-sized blocks to nanoscale clusters. Of particular importance is that the 0.90NaNbO(3)-0.10BiFeO(3) ceramic demonstrates ultrahigh W-rec of 18.5 J cm(-3) with giant electric breakdown strength of 99.5 kV mm(-1), which is superior than state-of-the-art bulk dielectric ceramics. Moreover, the 0.90NaNbO(3)-0.10BiFeO(3) ceramic exhibits superior frequency, cycling and thermal reliability, as well as the substantial current density (2140.6 A cm(-2)), ultrahigh power density (428.1 MW cm(-3)) and ultrafast discharge rate (14 ns). These results not only suggest that the NaNbO3-based relaxor antiferroelectric ceramics are promising candidates for advanced energy storage capacitors, but also provide feasible strategy of domain engineering to develop novel lead-free high-performance dielectric materials.