Flexible Lead-Free Ba0.5Sr0.5TiO3/0.4BiFeO3-0.6SrTiO3 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 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.

Tunable polarization-drived high energy storage performances in flexible PbZrO 3 films by growing Al 2O 3 nanolayers

“…High W rec of 35.2 J/cm 3 as well as superior η of 92.9% is obtained in the APAPA8 films, which is ascribed to the enhanced the breakdown strength and near-zero remanent polarization. A detailed comparison of W rec and η in this work (APAPA8 thin films) and Pb-based[6,12,14,17,[34][35][36], Na 0.5 Bi 0.5 TiO 3 (BNT)-based[16,[37][38][39][40][41][42][43], BaTiO 3 (BT)-based[44][45][46][47][48], BiFeO 3 (BFO)-based[49][50] thin films grown on flexible Mica substrates reported previously is exhibited in Fig.6(d). It can be seen that the APAPA8 flexible films in this work have high η (> 90%) due to the linear-like polarization.…”

High Energy Storage Performance and Large Electrocaloric Response in Bi0.5Na0.5TiO3–Ba(Zr0.2Ti0.8)O3 Thin Films

“…Efficient storage of harvested energy and its conversion into electrical energy are critical but challenging. Therefore, electrical energy storage technology has been extensively investigated. ,,− Traditional vapor compression cooling technologies used heavily in households and industry can produce greenhouse gases. These technologies cannot realize microchip dimensions and adapt to next-generation solid-state cooling devices. , Research and development of novel refrigeration technology are crucial.…”