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Enhanced energy storage properties of BNT-based ceramics by maintaining the high saturation polarization

Abstract Miniaturization is the key for development of lightweight energy storage ceramics. Here, lead-free ceramics with the formula (1-x) (0.94Bi0.5Na0.5TiO3-0.06BaTiO3)-xSr0.7La0.2TiO3 (BNT-6BT-xSLT) were successfully sintered using traditional solid-phase synthesis. The phase structure, micro-morphology, ferroelectricity, and energy storage efficiency and density of BNT-6BT-xSLT were investigated in this work. We found that the introduction of SLT does not alter the multi-phase coexistence of the ceramics, but inhibits the growth of crystal grains. Further, doping with Sr2+ and La3+ destroys the ferroelectric long-range order and enhances the ionicity of A-site ions, and thus increases energy storage property. As a result, the BNT-6BT-0.08SLT ceramic maintains a high P s value of 40.77 μC/cm3 and exhibits excellent energy storage performance (W = 1.76 J/cm3, η = 60.1%).