Flexible Lead-Free Ba(0.5)Sr(0.5)TiO(3)/0.4BiFeO(3)-0.6SrTiO(3) Dielectric Film Capacitor with High Energy Storage Performance.
Flexible Lead-Free Ba(0.5)Sr(0.5)TiO(3)/0.4BiFeO(3)-0.6SrTiO(3) Dielectric Film Capacitor with High Energy Storage Performance.
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DOI：
10.3390/nano11113065
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发表时间：
2021-11-14
期刊：
影响因子：
--
通讯作者：
Cheng Z
中科院分区：
文献类型：
--
作者：
Wang W;Qian J;Geng C;Fan M;Yang C;Lu L;Cheng Z
铁电薄膜电容器以其高的功率密度和超快的充放电速度引起了人们对脉冲功率系统的极大兴趣，但用于可穿戴电子设备和电力系统的柔性电容器的实现却较少受到关注。本文在云母衬底上制备了Ba0.5Sr0.5TiO_3/0.4BiFeO_3-0.6SrTiO_3薄膜电容器。它的储能密度为WREC~62J cm−3，由于具有中等的击穿强度(3000kV cm−1)和较强的弛豫特性，其效率为74%~74%。薄膜电容器的储能性能在很宽的温度范围(−50-200°C)和频率范围(500 Hz-20 kHz)也非常稳定。此外，WREC和η在经过108次疲劳循环后已经稳定下来。此外，在较小的弯曲半径(r=2 mm)下或经过104次机械弯曲循环后，可以很好地保持优异的储能能力。这些结果表明，本工作制备的Ba0.5Sr0.5TiO3/0.4BiFeO3-0.6SrTiO3薄膜电容器在柔性微储能系统中具有很大的应用潜力。
Ferroelectric thin film capacitors have triggered great interest in pulsed power systems because of their high-power density and ultrafast charge–discharge speed, but less attention has been paid to the realization of flexible capacitors for wearable electronics and power systems. In this work, a flexible Ba0.5Sr0.5TiO3/0.4BiFeO3-0.6SrTiO3 thin film capacitor is synthesized on mica substrate. It possesses an energy storage density of Wrec ~ 62 J cm−3, combined with an efficiency of η ~ 74% due to the moderate breakdown strength (3000 kV cm−1) and the strong relaxor behavior. The energy storage performances for the film capacitor are also very stable over a broad temperature range (−50–200 °C) and frequency range (500 Hz–20 kHz). Moreover, the Wrec and η are stabilized after 108 fatigue cycles. Additionally, the superior energy storage capability can be well maintained under a small bending radius (r = 2 mm), or after 104 mechanical bending cycles. These results reveal that the Ba0.5Sr0.5TiO3/0.4BiFeO3-0.6SrTiO3 film capacitors in this work have great potential for use in flexible microenergy storage systems.
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DOI：
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发表时间：
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影响因子：
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