Improvement of energy storage properties of Bi0.5 Na0.5TiO3 ceramics by doping La0.9Bi0.1Ni0.67Ta0.33O3

Dielectric capacitors have been extensively studied for high power density and fast charge-discharge rates. However, its lower recyclable energy density (Wrec) and efficiency (η) have limited its development in the field of pulse dielectric capacitors. In this work, La0.9Bi0.1Ni0.67Ta0.33O3 (LBNT) was introduced into Bi0.5 Na0.5TiO3 (BNT) using the solid-state reaction method to modify the phase structure and grain size of the ceramics, enhance the breakdown electric field (Eb) of the ceramics, and further improve the Wrec and η. The Eb was improved, the high polarization was retained by Bi3+ ions, and the reduction of the residual polarization (Pr) was achieved by enhancing the relaxation behavior. A high Wrec of 2.75 J/cm3 and a high η of 82.89 % were obtained at 0.85BNT-0.15LBNT, and excellent charge-discharge rates (current density CD = 639.06 A/cm2, power density PD = 51.25 MW/cm3, and charge-discharge rate t0.9 = 1.03 μs), which indicates excellent potential for energy storage applications.