Improved Energy Storage Density performance of the (1-x) [0.88BaTiO₃–0.12Bi(Li_0.5Nb_0.5)O₃]-x(0.8BaTiO₃–0.2SrTiO₃) Lead-Free Ceramics

Recently, dielectric ceramic materials have been widely explored for high-power capacitors applications. However, it is still challenged for capacitors to enhance the energy density and efficiency. Here, the (1-x)[0.88BaTiO₃–0.12Bi(Li_0.5Nb_0.5)O₃]-x(0.8BaTiO₃–0.2SrTiO₃) (0.05 ≤ x ≤ 0.20) ceramics were designed to improve both dielectric temperature stability and breakdown strength. Influence of composition and phase structure on dielectric properties were studied in detail. Improvement of both dielectric properties and energy storage performance was achieved in this work. The 0.95[0.88BaTiO₃–0.12Bi(Li_0.5Nb_0.5)O₃]-0.05(0.8BaTiO₃–0.2SrTiO₃) ceramic shows the best performance, with an energy storage density up to 2.88 J/cm³ (W_e ∼ 2.51 J/cm³) and a high efficiency ∼ 86.81% under 320 kV/cm. This work not only provides key materials for the next generation of high-end energy storage capacitors, but also suggests a different route for optimizing the performance of other relaxor ferroelectrics.