High energy storage properties of NaNbO₃-based relaxor antiferroelectric ceramics for capacitor applications

A new generation of environmentally benign NaNbO3 (NN)-based antiferroelectric ceramics have gained great interest in energy storage capacitors. Nevertheless, the low breakdown electric field (Eb) and high energy density loss in pure NN ceramic restrict the improvement of the energy storage property. A combined optimization strategy was implemented in this work, and ceramics of (1-x)NaNbO3-x(Bi1/2Li1/2)HfO3 (abbreviated as NNxBLH, x = 0.00-0.18) were developed. BLH was initially introduced to stablize the AFE state and achieve the relaxor enhancement effect. Then, a viscous polymer rolling process (VPRP) was empolyed to obtain highly dense and ultra-thin ceramic disks with a thickness of similar to 100 mu m. Ultimately, at 560 kV/cm, a high Wrec of 7.1 J/cm(3) and eta of 85.9% were concurrently attained in the NN-0.18BLH ceramic. Meanwhile, the NN-0.18BLH ceramic displays improved thermal stability (25-120 degrees C). All of these findings show that the NN-0.18BLH ceramic is anticipated to be utilized in future energy storage applications.