Excellent Energy-Storage Performance in BNT-SST-LMN Lead-Free Relaxor Ferroelectric Ceramics with High Electrical Homogeneity

Abstract

Relaxor ferroelectric materials have received increasing attention in pulse power devices due to the high power density and rapid charge−discharge capability. However, challenges exist in relaxor ferroelectric behavior because of their low electric breakdown strength. In this article, a large recoverable energy density of 5.94 J/cm 3 , together with a high energy efficiency of 86.9%, is achieved synchronously in La-(Mg 2/3 Nb 1/3 )O 3 (LMN) modified Bi 0.5 Na 0.5 TiO 3 -Sr 0.7 Sm 0.2 TiO 3 (BNT-SST) ceramic. It is suggested that the addition of LMN reduces the grain size and enhances the electrical homogeneity, which boosts the electric breakdown strength of sample ceramics. In addition, in 0.03LMN modified 0.97(BNT-SST) ceramic, a good discharge energy density of 3.9 J/cm 3 and a transient discharge time of 65 ns are attained. Meanwhile, the outstanding stability in the temperature range of 20−100 °C and frequency range of 1−100 Hz is observed in the above component. These results indicate that BNT-SST-LMN ceramic has potential as an energy-storage medium.

Excellent Energy Storage Performance of Perovskite High-Entropy Oxide-Modified (Bi0.5Na0.5)TiO3-Based Ceramics

“…These factors lead to an outstanding improvement in energy storage performance. Figure presents the W rec and E b obtained in this work and those of other recently reported BNT-SBT base ceramics. ,,− It is obvious that BNT-SBT-0.3BNCBSTN synthesized in the present work exhibits significant E b and W rec compared to the other BNT-based systems, revealing that high-entropy design is a feasible approach to enhance energy storage performance.…”