Synthesis, analysis and characterizations to enhance energy storage performances in (1-x)NaNbO3-xBi(Fe0.5Sc0.5)O3 ceramics

(1-x)NaNbO3-xBi(Fe0.5Sc0.5)O3 (NN-xBFS) ceramics were prepared by solid-state sintering method. All samples have pseudocubic structure and micron-sized grains. The addition of BFS promotes the generation of polar nanoregions, maintains large polarization, and enhances the ability to resist external electric fields, creating conditions for achieving high energy storage density Wrec and efficiency eta simultaneously. The x = 0.12 ceramic shows a high Wrec of 4.32 J/cm3 and large eta of 85 % at 740 kV/cm, together with excellent power density of 325 MW/cm3, large current density of 1327 A/cm2, ultra fast discharge speed of 64 ns and strong hardness of 3.56 GPa. Good temperature stability in the range of 20 -160 degrees C and excellent fatigue resistance under 106 cycles are attained. The findings of this study can help us better perform composition design to promote the collaborative optimization of energy storage density and efficiency of ceramics.