Enhanced energy storage performance of KNN-BLZS dielectric ceramic

Exploring high-performance energy storage dielectric ceramics for pulse power applications is paramount concern for a multitude of researchers. In this work, a (1 - x)K${}_{0.5}$Na${}_{0.5}$NbO${}_3$-xBi${}_{0.5}$La${}_{0.5}$(Zn${}_{0.5}$Sn${}_{0.5}$)O${}_3$ ((1-x)KNN-xBLZS) lead-free relaxor ceramic was successfully synthesized by a conventional solid-reaction method. X-ray diffraction and Raman spectra confirm the perovskite structure of the ceramics. With the addition of BLZS, the crystal growth is suppressed, the ceramic resistivity increases, and the relaxation properties of ceramics are enhanced. By optimizing the composition to x = 0.12, we achieved a significant ΔP of 12.8 µC/cm${}^2$, a P${}_{max}$ of 14.6 µC/cm${}^2$, and a P${}_r$ of 1.8 µC/cm${}^2$. The resulting W${}_{rec}$ reached 0.84 J/cm${}^3$, accompanied by an outstanding efficiency (η) of 76%, superior frequency reliability, and robust thermal stability. Owing to these exceptional properties, the 0.88 KNN-0.12 BLZS ceramic demonstrates great potential for pulse power applications.