High electric energy and power density achieved in [formula omitted] antiferroelectric ceramics by La dopants

Abstract

In order to improve the energy storage and discharge performance of ceramic dielectric capacitors, antiferroelectric materials have drawn wide attention. In this work, a comprehensive investigation on Pb1−xLax[(Zr0.55Sn0.45)0.92Ti0.08]1−x∕4O3 (x = 0%, 2%, 4%, 6%) antiferroelectric ceramics are fabricated by a rolling process. With the addition of lanthanum(La), the average grain size and the electric-field-induced strain are suppressed. However, the energy conversion efficiency, particularly the efficiency of −60 °C, is enhanced with increasing La content. In addition, the released energy density calculated by the “quasi-static” method(Wre) and “dynamic” method(Wdis) were investigated comparatively. As the content of La increase, the discrepancy betweenWre andWdis gradually decreased. Specifically, the composition with 4%La doped has the best comprehensive performance, with the highest recoverable energy density of 5.61 J/cm3 and ultrahigh efficiency of 90% at 410 kV/cm. Moreover, a discharge energy density of 3.6 J/cm3 can be obtained at 222 kV/cm and 90% can be released in 0.68μs. By directly short experiment, a current density of 1599A/cm2 and power density of 177 MW∕cm3 were obtained. These results indicated that PLZST 4/55/45/8 is promising for high electric energy and power density capacitors.