Improved energy storage performances of lead-free BiFeO3-based ceramics via doping Sr0.7La0.2TiO3

Substantial attention for dielectric ceramic capacitors toward lead-free has been driven by the enhanced awareness of environmental protection. However, the unsatisfying breakdown strength (E-b) and comparatively low efficiency (eta) becomes an obstacle for their widespread application. Here, environment friendly lead-free relaxor ferroelectric (1-x) (0.67BiFeO(3)-0.33Ba(0.8)Sr(0.2)TiO(3))-xSr(0.7)La(0.2)TiO(3) + 0.1 wt% MnO2 (BFO-BST-SLT) ceramic is reported as an efficient route to possess excellent E-b and high eta simultaneously. The doping of SLT can significantly suppress the grain growth, improve the relaxation behavior, and thus increasing the E-b and eta of the ceramics. Consequently, the corresponding ceramics with x = 0.3 achieves good discharged energy density of similar to 2.55 J/cm(3) and ultrahigh eta of similar to 92%. Notably, it presents outstanding charging/discharging performances with fast charging/discharging time (similar to 0.0266 mu s), power density (similar to 28.11 MW/cm(3)) along with current density (similar to 468.5 A/cm(2)). Together with great temperature stability, frequency stability and cycle stability, this contributes provides a crucial way to prepare lead-free dielectrics for next-generation pulsed power capacitor applications. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study reports a lead-free ceramic material with improved breakdown strength and efficiency through doping, achieving high discharge energy density and fast charging/discharging time, which is crucial for future pulsed power capacitor applications.