Flexible lead-free ba0.5 sr0.5 tio3 /0.4bifeo3-0.6srtio3 dielectric film capacitor with high energy storage performance
Publication Name
Nanomaterials
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 Ba0.5 Sr0.5 TiO3 /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 Ba0.5 Sr0.5 TiO3 /0.4BiFeO3-0.6SrTiO3 film capacitors in this work have great potential for use in flexible microenergy storage systems.
Open Access Status
This publication may be available as open access
Volume
11
Issue
11
Article Number
3065
Funding Number
2020GXRC051
Funding Sponsor
Australian Research Council