Abstract
The development of ABO_3 perovskite-structured dielectric materials with high recoverable energy storage density (V_(rec)) and power density (P_D) is crucial for the downsizing of pulsed power devices. Despite several research efforts, achieving a high W_(rec) over a wide working temperature range in an environmentally benign system remains a difficulty. A synergistic design strategy is given here, which includes concurrently doping at the A- and B-site to achieve a spread and depressed dielectric response, adding sintering aids, and employing advanced viscous polymer rolling technology for dense and ultra-thin ceramic samples, respectively. Finally, at a relatively low electric field of 380 kV/cm, an ultrahigh W_(rec) of 6.57 J/cm~3 is realized in (Bi_(0.5)Na_(0.5))_(0.93)Ca_(0.07)Ti_(0.85)Zr_(0.15)O_3-0.5 wt% Li_2CO_3 component, which benefits from gentle polarization saturating and improved breakdown strength. The W_(rec) can be maintained above 6 J/cm~3 while maintaining strong thermal stability (variation ≤ ± 3%) over a temperature range of 30-150 °C. Because BNT-based materials have such high energy storage performance and temperature stability, they are not only a promising candidate for replacing lead-based dielectrics, but also a valuable guide for developing new high-performance ferroelectric materials for future energy storage devices in the pulsed power system.
NSTL
Elsevier