Issue 15, 2023

Ultrahigh energy storage density, high efficiency and superior thermal stability in Bi0.5Na0.5TiO3-based relaxor ferroelectric ceramics via constructing multiphase structures

Abstract

Ceramic-based capacitors with high power density, fast charge/discharge rate and superior reliability are fundamental components for high/pulsed power devices. Bi0.5Na0.5TiO3-based relaxor ferroelectric ceramics with a perovskite structure are among the up-and-coming candidates for capacitive energy storage because of their environment-friendly composition, easy-synthesis and high saturation polarization. However, the simultaneous achievement of ultrahigh recoverable energy density (Wrec), high energy storage efficiency (η) and superior reliability still remains a huge challenge because of the competition between various crucial parameters. Herein, multiphase structures with rhombohedral (R3c) and tetragonal (P4bm) phases are achieved in Bi0.5Na0.5TiO3–Ba0.7Sr0.3Zr0.8Sn0.2O3 ceramics. The coexistence of strong and weak coupled polar nanoregions (PNRs) results in a relatively high polarization (Pmax) and a decreased remanent polarization (Pr). Accordingly, the selective ceramics display an ultrahigh Wrec of 7.4 J cm−3, a high η of 89% at 400 kV cm−1 and remarkable thermal stability in a wide temperature range of 25–180 °C, exhibiting extraordinary comprehensive energy storage performances in BNT-based ceramic capacitors. This work demonstrates a feasible way for exploring high-performance dielectric capacitors.

Graphical abstract: Ultrahigh energy storage density, high efficiency and superior thermal stability in Bi0.5Na0.5TiO3-based relaxor ferroelectric ceramics via constructing multiphase structures

Supplementary files

Article information

Article type
Communication
Submitted
04 yan 2023
Accepted
27 fev 2023
First published
08 mar 2023

J. Mater. Chem. A, 2023,11, 7987-7994

Ultrahigh energy storage density, high efficiency and superior thermal stability in Bi0.5Na0.5TiO3-based relaxor ferroelectric ceramics via constructing multiphase structures

Y. Huang, J. Zhang, J. Wang, J. Wang and Y. Wang, J. Mater. Chem. A, 2023, 11, 7987 DOI: 10.1039/D3TA00068K

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