Tailoring properties of (Bi0.51Na0.47)TiO3 based dielectrics for energy storage applications

Lead free dielectric ceramics of 0.65Bi0.51Na0.47Ti1-5x/4NbxO3- 0.35Ba(Ti0.7Zr0.3)O3 (BB35-100xNb, x = 0.00, 0.01, 0.02, 0.04 and 0.08) are fabricated by conventional solid-state sintering method for potential energy storage applications. Benefited from the coexistence of relaxor and antiferroelectric features, a high recoverable energy storage density of 3.2 J/cm3, together with high energy efficiency of 93%, is simultaneously achieved in bulk BB35-1Nb ceramic at the critical electric field of 280 kV/cm. The studied BB35-1Nb ceramic exhibits a wide temperature usage range of 20-160 °C with energy density variation below 3%, and excellent cycling reliability with both energy density and efficiency variations less than 4% over 106 cycles, together with its fast discharge time of ˜1.2 μs, making BB35-1Nb ceramic promising candidate for high-temperature, high power energy storage applications.