Flexible Lead-Free Ba<sub>0.5</sub>Sr<sub>0.5</sub>TiO<sub>3</sub>/0.4BiFeO<sub>3</sub>-0.6SrTiO<sub>3</sub> Dielectric Film Capacitor with High Energy Storage Performance
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 fl...
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| Autores principales: | , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/b3e97eeaa63c42258a09f21d5a9f36e1 |
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| Sumario: | 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 Ba<sub>0.5</sub>Sr<sub>0.5</sub>TiO<sub>3</sub>/0.4BiFeO<sub>3</sub>-0.6SrTiO<sub>3</sub> thin film capacitor is synthesized on mica substrate. It possesses an energy storage density of <i>W</i><sub>rec</sub> ~ 62 J cm<sup>−3</sup>, combined with an efficiency of <i>η</i> ~ 74% due to the moderate breakdown strength (3000 kV cm<sup>−1</sup>) 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 <i>W</i><sub>rec</sub> and <i>η</i> are stabilized after 10<sup>8</sup> fatigue cycles. Additionally, the superior energy storage capability can be well maintained under a small bending radius (<i>r</i> = 2 mm), or after 10<sup>4</sup> mechanical bending cycles. These results reveal that the Ba<sub>0.5</sub>Sr<sub>0.5</sub>TiO<sub>3</sub>/0.4BiFeO<sub>3</sub>-0.6SrTiO<sub>3</sub> film capacitors in this work have great potential for use in flexible microenergy storage systems. |
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