Enhanced Energy Storage Performance of AgNbO3:xCeO(2) by Synergistic Strategies of Tolerance Factor and Density Regulations

AgNbO3-based ceramics have been widely studied as ideal lead-free materials. Herein, AgNbO3:xCeO(2) (x = 0, 1, 2 mol%) ceramics were successfully prepared by the conventional solid-state reaction method. The optimization of energy storage properties is ascribed to the enhanced antiferroelectric (AFE) stability and the increased breakdown strength (E-b). The reduction of the tolerance factor leads to the enhancement of AFE stability. In addition, the enhancement of E-b is due to the increase of actual density, which is achieved through the regulation of CeO2 amount and grinding procedure in the experimental process. A high recoverable energy density (W-rec) of 5.04 J/cm(3) and an energy efficiency (eta) of 46.2% were achieved in AgNbO(3:)0.01CeO(2) ceramics under an applied electric field up to 390 kV/cm. A higher eta of 55.4% was obtained in AgNbO3:0.02CeO(2) components. This research provides guidance for finding ceramic materials with comprehensive energy storage properties.