Recent development of lead-free relaxor ferroelectric and antiferroelectric thin films as energy storage dielectric capacitors

Abstract

Dielectric electrostatic capacitors are breakthroughs in energy storage applications such as pulsed power applications (PPAs) and miniaturized energy-autonomous systems (MEASs). Low power density, poor charge-discharge speed, and deprived breakdown strength of batteries and electrochemical capacitors limit their use in various implantable, wearable, and portable electronics. Recently, relaxor ferroelectric (RFE) and anti-ferroelectric (AFE) thin film capacitors have emerged as appropriate candidates for PPAs and MEASs. High energy storage density (50-120 J/cm3), large power density (109-1010 W/kg), ultrafast charge-discharge speed (μs range), superior dielectric breakdown strength (DBS) (~MV/cm), and excellent thermal stability (150-275 oC) in RFE and AFE capacitors are appropriate for high power and miniaturized electronic device applications. In this review article, we portray a succinct discussion of the energy storage properties of RFE and AFE-based thin films.