材料科学
纳米晶材料
电容器
电介质
铁电性
薄膜
极化(电化学)
热稳定性
光电子学
储能
工程物理
复合材料
纳米技术
电气工程
电压
功率(物理)
化学工程
物理
量子力学
物理化学
化学
工程类
作者
Peng Wang,Xusheng Wang,Guorong Li,Rui Hu,Kun Zhu,Yanxia Li,Xi Yao,Zhongbin Pan
标识
DOI:10.1021/acsami.2c01238
摘要
Electrostatic capacitors, though presenting faster rate capability and higher power density, are hindered in applications because of their low energy density. Accordingly, many efforts in electrostatic capacitors, for electronics and electrical power systems, have mainly concentrated on the development of dielectric materials with high-energy density (Ud) and charge-discharge efficiency (η) as well as good stability performances of thermal and fatigue endurance. Herein, we demonstrate that an excellent Ud (∼90 J/cm3) and high η (∼84.2%), as well as outstanding fatigue cycles (1 × 108 st), frequency stability (20-2000 Hz), and a wide temperature range (RT ∼ 160 °C), can be attained in Ba2Bi3.9Pr0.1Ti5O18 (BBPT) ferroelectric thin films via nanocrystalline engineering. It is revealed that nanocrystalline engineering of the BBPT ferroelectric thin films could be controlled via the heat-treatment temperature, which could effectively regulate the breakdown strength and polarization. The enhanced breakdown strength and polarization of the nanocrystalline engineering is further verified through the theoretical phase-field simulations along with experimental results. These results indicate that this is a feasible and scalable route to develop dielectric thin film materials with a high energy storage capability.
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