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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 0.5 Sr 0.5 TiO 3 /0.4BiFeO 3 -0.6SrTiO 3  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 10 8  fatigue cycles. Additionally, the superior energy storage capability can be well maintained under a small bending radius ( r  = 2 mm), or after 10 4  mechanical bending cycles. These results reveal that the Ba 0.5 Sr 0.5 TiO 3 /0.4BiFeO 3 -0.6SrTiO 3  film capacitors in this work have great potential for use in flexible microenergy storage systems.

Flexible Lead-Free Ba0.5Sr0.5TiO3/0.4BiFeO3-0.6SrTiO3 Dielectric Film Capacitor with High Energy Storage Performance