Dielectric capacitors have become a key enabling technology for electronics and electrical systems. Although great strides have been made in the development of ferroelectric ceramic and thin films for capacitors, much less attention has been given to preventing polarization fatigue, while improving the energy density, of ferroelectrics. Here superior capacitive properties and outstanding stability are reported over 10⁷ charge/discharge cycles and a wide temperature range of −60 to 200 °C of ferroelectric Aurivillius phase Bi_3.25La_0.75Ti₃O₁₂‐BiFeO₃ (BLT‐BFO), which represents one of the best capacitive performances recorded for the ferroelectric materials. The modification of BLT thin films with BFO overcomes the constraints of ferroelectric Aurivillius compounds and presents an unprecedented combination of the ideal features including improved polarization, reduced ferroelectric hysteresis, and lowered leakage current for high‐energy‐density capacitors. Given the lead‐free and fatigue‐free nature of this Aurivillius phase ferroelectric, this work unveils a new approach towards high‐performance eco‐friendly ferroelectric materials for electrical energy storage applications.

中文翻译：

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具有超高储能性能的无疲劳Aurivillius相铁电薄膜

介电电容器已成为电子和电气系统的关键技术。尽管在铁电陶瓷和电容器薄膜的开发方面已取得了长足的进步，但在提高铁电体的能量密度的同时防止极化疲劳却很少受到关注。在10 ^7个充电/放电循环和−60至200°C的宽温度范围内，铁电Aurivillius相Bi _3.25 La _0.75 Ti ₃ O ₁₂ ‐BiFeO ₃表现出优异的电容特性和出色的稳定性。（BLT-BFO），代表铁电材料记录的最佳电容性能之一。用BFO改性BLT薄膜克服了铁电Aurivillius化合物的局限性，并提供了前所未有的理想特性组合，包括改善极化，降低铁电磁滞和降低高能密度电容器的漏电流。鉴于这种Aurivillius相铁电体的无铅和无疲劳特性，这项工作揭示了一种用于电能存储应用的高性能环保铁电体材料的新方法。