材料科学
电致伸缩
极化(电化学)
储能
陶瓷电容器
复合材料
压电
光电子学
电容器
电压
电气工程
功率(物理)
化学
物理
物理化学
量子力学
工程类
作者
Leiyang Zhang,Ruiyi Jing,Yunyao Huang,Yule Yang,Jing Wang,Yanan Zhang,Shuyao Cao,Zibin Chen,Feng Gao,Yuxiao Du,Shiyu Zhou,Jianwei Zhao,Shiyu Liu,Dawei Wang,Shujun Zhang,Li Jin
标识
DOI:10.1002/adma.202406219
摘要
Abstract In pulse power systems, multilayer ceramic capacitors (MLCCs) encounter significant challenges due to the heightened loading electric field ( E ), which can lead to fatigue damage and ultrasonic concussion caused by electrostrictive strain. To address these issues, an innovative strategy focused on achieving an ultra‐weak polarization‐strain coupling effect is proposed, which effectively reduces strain in MLCCs. Remarkably, an ultra‐low electrostrictive coefficient ( Q 33 ) of 0.012 m 4 C −2 is achieved in the composition 0.55(Bi 0.5 Na 0.5 )TiO 3 ‐0.45Pb(Mg 1/3 Nb 2/3 )O 3 , resulting in a significantly reduced strain of 0.118% at 330 kV cm −1 . At the atomic scale, the local structural heterogeneity leads to an expanded and loose lattice structure, providing ample space for large ionic displacement polarization instead of lattice stretching when subjected to the applied E . This unique behavior not only promotes energy storage performance (ESP) but also accounts for the observed ultra‐low Q 33 and strain. Consequently, the MLCC device exhibits an impressive energy storage density of 14.6 J cm −3 and an ultrahigh efficiency of 93% at 720 kV cm −1 . Furthermore, the superior ESP of the MLCC demonstrates excellent fatigue resistance and temperature stability, making it a promising solution for practical applications. Overall, this pivotal strategy offers a cost‐effective solution for state‐of‐the‐art MLCCs with ultra‐low strain‐vibration in pulse power systems.
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