Achieved high energy storage property and power density in NaNbO3-Bi(Sn0.5Ni0.5)O3 ceramics

Recently, NaNbO3 has aroused the enthusiasm of researchers due to its potential application for energy storage. In this work, lead-free (1-x)NaNbO3-xBi(Sn0.5Ni0.5)O3 ceramics or (1-x)NN-xBSN in abbreviation were prepared by the traditional solid-state reaction method. The microstructure, dielectric properties and energy storage performances of (1-x)NN-xBSN ceramics were investigated in detail. Superior breakdown strength and underdamped discharge abilities are achieved in 0.88NN-0.12BSN ceramic with a maximum recoverable energy storage density (2.01 J/cm3) and high efficiency (80.3%) at 310 kV/cm. The excellent stability of energy storage properties in the frequency range from 100 Hz to 1 MHz, and the temperature range from −150 to 300 °C, are observed in the 0.88NN-0.12BSN ceramic. Furthermore, the 0.88NN-0.12BSN ceramic exhibits a large current density (~979.59 A/cm2), an extremely high power density (~88.16 MW/cm3) and stable discharge period of about 51 ns.