Enhanced Energy Storage Performance of Bi(Mg0.5sn0.5)O3 Modifed 0.60bi0.5na0.5tio3-0.35srtio­3-0.05bifeo3 Ceramics

Abstract

This study focuses on the synthesis and characterization of (1–x)(0.6Bi0.5Na0.5TiO3-0.35SrTiO3-0.05BiFeO3)-x Bi(Mg0.5Sn0.5)O3 ((1-x)(BNT-ST-BF)-x(BMS)) for (0.00≤ x ≤0.20) ceramics for energy storage applications. A solid-state sintering route is employed for the fabrication of the ceramics. XRD data reveals the formation of the parent phase along with minor secondary phase in each ceramic composition in the present study. The dopants of BMS led to decrease the dielectric loss (tanδ ≤3%) for x=0.10 at temperatures (25–400 °C). The small grain size of the sample (x=0.10) is responsible for its lower electrical conductivity which enhance the energy storage performance. Further the overall resistance of all compositions decreases with increasing the temperature which is indicative of semiconducting behavior. It was observed for the sample; x=0.10, enhancement in the overall properties as stored energy density ~2.67 J/cm3 (Ws), recoverable energy density ~1.691 J/cm3 (Wrec) and efficiency; ~63.28% (η) at dielectric breakdown strength; BDS~200.33 kV/cm. This composition may be suitable for energy storage capacitor for pulsed power applications.

Keywords: Capacitor, BNT, Impedance spectroscopy, Energy storage density, Breakdown strength