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Flexible Lead-Free Ba_0.5Sr_0.5TiO₃/0.4BiFeO₃-0.6SrTiO₃ Dielectric Film Capacitor with High Energy Storage Performance.

ABSTRACT: 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_0.5Sr_0.5TiO₃/0.4BiFeO₃-0.6SrTiO₃ thin film capacitor is synthesized on mica substrate. It possesses an energy storage density of W_rec ~ 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 W_rec 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 Ba_0.5Sr_0.5TiO₃/0.4BiFeO₃-0.6SrTiO₃ film capacitors in this work have great potential for use in flexible microenergy storage systems.

SUBMITTER: Wang W

PROVIDER: S-EPMC8622521 | biostudies-literature |

REPOSITORIES: biostudies-literature

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