材料科学
储能
极化(电化学)
电容器
电介质
陶瓷
铁电性
相界
极地的
凝聚态物理
相(物质)
光电子学
复合材料
电压
热力学
电气工程
物理化学
物理
工程类
功率(物理)
有机化学
化学
天文
作者
Da Li,Di Zhou,Dong Wang,Weifeng Zhao,Yong-Xin Guo,Zhongqi Shi,Tao Zhou,Shi-Kuan Sun,Charanjeet Singh,S. V. Trukhanov,A. S. B. Sombra
出处
期刊:Small
[Wiley]
日期:2022-12-11
卷期号:19 (8): 2206958-2206958
被引量:7
标识
DOI:10.1002/smll.202206958
摘要
One of the long-standing challenges of current lead-free energy storage ceramics for capacitors is how to improve their comprehensive energy storage properties effectively, that is, to achieve a synergistic improvement in the breakdown strength (Eb ) and the difference between maximum polarization (Pmax ) and remnant polarization (Pr ), making them comparable to those of lead-based capacitor materials. Here, a polymorphic polar nanoregions (PNRs) structural design by first introducing 0.06 mol BaTiO3 into Bi0.5 Na0.5 TiO3 is proposed to construct the morphotropic phase boundary with coexisting structures of micrometer-size domains and polymorphic nanodomains, enhance the electric field-induced polarization response (increase Pmax ). Then Sr(Al0.5 Ta0.5 )O3 (SAT)-doped 0.94 Bi0.5 Na0.5 TiO3 -0.06BaTiO3 (BNBT) energy storage ceramics with polymorphic PNRs structures are synthesized following the guidance of phase-field simulation and rational composition design (decrease Pr ). Finally, a large recoverable energy density (Wrec ) of 8.33 J cm-3 and a high energy efficiency (η) of 90.8% under 555 kV cm-1 are obtained in the 0.85BNBT-0.15SAT ceramic prepared by repeated rolling process method (enhance Eb ), superior to most practical lead-free competitors increased consideration of the stability of temperature (a variation <±6.2%) and frequency (Wrec > 5.0 cm-3 , η > 90%) at 400 kV cm-1 . This strategy provides a new conception for the design of other-based multifunctional energy storage dielectrics.
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