High energy storage property of Na0.5Bi0.5TiO3-based ceramics modified by complex-ion and SrTiO3

Abstract

Exploring high-effect and pollution-free energy storage devices is the most important issue to be solved for many researchers. In this work, (Bi 0.5 Na 0.5 )TiO 3 -based lead-free ceramics were modified by La 3+ in the A-site and (Al 0.5 Nb 0.5 ) 4+ in the B-site, respectively. In order to further modify, a linear dielectric of SrTiO 3 was incorporated. By this means, novel (1- x )(Bi 0.48 La 0.02 Na 0.5 )Ti 0.92 (Al 0.5 Nb 0.5 ) 0.08 O 3 - x SrTiO 3 [(1- x )(BLNANT)- x ST] ceramics were prepared by traditional solid state reaction method. The crystal structure, microstructure, dielectric properties and energy storage properties were investigated. In particular, a great recoverable energy density (3.35 J/cm 3 ) and efficiency (78.8%) were achieved under a low electric field of 255 kV/cm for the optimal composition. In addition, the P-E loops of this ceramic possess a good temperature (25–150 °C) and frequency stability (1–100 Hz) under the electric field of 150 kV/cm. Finally, an extremely fast discharge time (t 0.9 ) of 71.3 ns and an eminent power density ( P D ) of 39.04 MW/cm 3 can be obtained. These characteristics indicate that the ceramics of this work possess a good potential for high energy storage application. • Doping can improve the performance of energy storage ceramic. • Smaller grain size is conducive to withstand a high electric fields. • It is necessary to achieve high energy storage performance at low electric fields. • Ultra-fast discharge time and ultra-high power density can be achieved.