Excellent energy storage properties and fast discharging speed of BFO-based relaxor ferroelectric ceramics

Abstract

The poor comprehensive energy storage performance (energy storage density and energy storage efficiency) is a key scientific problem to be solved in the field of energy storage ceramics. In this work, (0.67-x)BiFeO3-xBi0.1Na0·7NbO3-0.33BaTiO3-0.15 wt%MnCO3 (BNBFNT-x, x = 0, 0.1, 0.2, and 0.3) ceramics were designed. The microstructure, dielectric properties, energy storage properties, and charge-discharge performances of BNBFNT-x ceramics were systematically investigated. The maximum recoverable energy density Wrec of the BNBFNT-0.10 ceramic is 3.06 J/cm3 with an efficiency of 81.4%. Apart from that, the ceramic also demonstrates excellent frequency (the variation of Wrec in the frequency range of 10 Hz – 90 Hz is ± 6.4%) and thermal stability (the variation of Wrec in the temperature range of 25 °C – 100 °C is ± 7.3%). Furthermore, the BNBFNT-0.10 ceramic has ultra-fast charge and discharge speeds (t0.9 = 0.032 μs), a large power density (PD = 22.2 MW/cm3), and an extremely high current density (CD = 355.6 A/cm2).