Enhanced Energy Storage Properties of BNT-based Ceramics by Maintaining the High Saturation Polarization

Miniaturization is the key for development of lightweight energy storage ceramics. Here, lead-free ceramics with the formula (1-x) (0.94Bi(0.5)Na(0.5)TiO(3)-0.06BaTiO(3))-xSr(0.7)La(0.2)TiO(3) (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 mu C/cm(3) and exhibits excellent energy storage performance (W = 1.76 J/cm(3), eta = 60.1%).