Wang Wenwen, Qian Jin, Geng Chaohui, Fan Mengjia, Yang Changhong, Lu Lingchao, Cheng Zhenxiang
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China.
Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Innovation Campus, North Wollongong, NSW 2500, Australia.
Nanomaterials (Basel). 2021 Nov 14;11(11):3065. doi: 10.3390/nano11113065.
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 BaSrTiO/0.4BiFeO-0.6SrTiO thin film capacitor is synthesized on mica substrate. It possesses an energy storage density of ~ 62 J cm, combined with an efficiency of ~ 74% due to the moderate breakdown strength (3000 kV cm) 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 and are stabilized after 10 fatigue cycles. Additionally, the superior energy storage capability can be well maintained under a small bending radius ( = 2 mm), or after 10 mechanical bending cycles. These results reveal that the BaSrTiO/0.4BiFeO-0.6SrTiO film capacitors in this work have great potential for use in flexible microenergy storage systems.
铁电薄膜电容器因其高功率密度和超快的充放电速度而在脉冲功率系统中引起了极大的关注，但对于可穿戴电子设备和电力系统中柔性电容器的实现却关注较少。在这项工作中，在云母衬底上合成了一种柔性BaSrTiO/0.4BiFeO - 0.6SrTiO薄膜电容器。由于其适中的击穿强度（3000 kV/cm）和强弛豫行为，它具有约62 J/cm³的储能密度，以及约74%的效率。该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）内也非常稳定。此外，经过10次疲劳循环后，其储能密度和效率保持稳定。另外，在小弯曲半径（r = 2 mm）下或经过10次机械弯曲循环后，其优异的储能能力仍能得到很好的保持。这些结果表明，这项工作中的BaSrTiO/0.4BiFeO - 0.6SrTiO薄膜电容器在柔性微储能系统中具有巨大的应用潜力。
