Enhanced energy storage performances of Bi(Ni1/2Sb2/3)O3 added NaNbO3 relaxor ferroelectric ceramics

In the development of dielectric ceramic materials, the requirements of miniaturization and integration are becoming increasingly prominent. How to obtain greater capacitance in a smaller volume is one of the important pursuits. In this paper, lead-free (1- x )NaNbO 3 - x Bi(Ni 1/2 Sb 2/3 )O 3 ( x BNS) with high recoverable energy storage density ( W rec ) and relatively high energy storage efficiency( η) were prepared by a solid state sintering method. Bi(Ni 1/2 Sb 2/3 )O 3 was introduced into the Sodium niobate ceramics(NN)-based ceramics to reduce the sintering temperature and increase the maximum breakdown field strength ( E b ). Finally, 0.15BNS achieved a high E b of 460 kV/cm, W rec of 3.7 J/cm 3 and η of 77%. In addition, the sample maintained excellent stability in the frequency range of 1–120 Hz. And the 0.15BNS ceramics also exhibited high power density ( P D = 36.4 MW/cm 3 ), large current density ( C D = 520.8 A/cm 2 ) and relatively fast charge-discharge rate ( t 0.9 = 1050 ns). These results demonstrate the potential application value of x BNS ceramics in energy storage capacitors.