Abstract
Dielectric capacitors with excellent power density and rapid charge-discharge rates have received significant attention in the field of pulsed power. In this study, anti-ferroelectric NaNb0.98Ta0.02O3 was doped into (Na0.5Bi0.5)0.935Sr0.065TiO3 ceramics, resulting in a substantial improvement of the integrated energy storage performance of the ceramics. Multiscale testing confirmed that the ceramic system formed a dense solid solution with a single-phase perovskite structure. Increasing the content of NaNb0.98Ta0.02O3 effectively enhances the relaxation and energy storage properties of the ceramics, while reducing average grain size improves their breakdown field strength, leading to excellent electrical properties at 30 kV/mm field strength when x = 0.2 for this ceramic system - exhibiting recoverable energy storage density Wrec = 7.98 J/cm3 and energy storage efficiency η = 90 %. Furthermore, it demonstrates excellent stability over a wide frequency range (5–90 Hz): Wrec = 7.97 ± 2 % J/cm3, η = 89 ± 1 %; as well as stability over a wide temperature range (30–200 °C): Wrec = 7 ± 2 % J/cm3, η = 89 ± 1 %, along with a rapid charging-discharging rate t0.9 = 0.32 μs. These outstanding properties indicate great prospects for future applications of this ceramic system in the field of energy storage capacitors.
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