Enhanced Energy Storage Performance of Bisco3 Modified Bi(0.5na0.5)Tio3-Batio3 Lead-Free Ferroelectric Ceramics

Abstract

Dielectric energy storage devices show potential to aid in the transition to renewable energy sources, but the performance of environmentally friendly lead-free ceramics lags behind that of lead-based materials. In this work, lead-free ferroelectric ceramics 0.85(Bi0.5Na0.5)TiO3-(0.15-x)BaTiO3-xBiScO3(0.85(Bi0.5Na0.5)TiO3-(0.15-x)BaTiO3-xBiScO3 with x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, or 0.14) were prepared using a high-temperature solid phase method to investigate their phase structures, microstructures, dielectric and ferroelectric properties. The most noticeable change with the incorporation of BiScO3 possessing a rhomboidal (R3c) perovskite structure was the thinning of the hysteresis loop. The 0.85BNT-0.11BT-0.04BS ceramics demonstrate a notable polarization difference ∆P (Pm - Pr) of 71.3μC/cm2, thus resulting in a high reversible energy storage density of 5.14 J/cm3and an impressive energy storage efficiency of 77.4% under an applied electric field strength of 240 kV/cm. Moreover, the ceramic exhibits excellent frequency stability within the range of 1 to 100 Hz, remarkable temperature stability from 25 to 150 °C, exceptional fatigue resistance up to 5×105 cycles, and rapid discharge time (0.140 μs). Therefore, this ceramic material holds potential as a power storage device in low and medium electric field.

Keywords: Energy storage, Lead-free, ceramics, Ferroelectrics