Abstract
Dielectric capacitors, because of their rapid charging-discharging capabilities and high power density, are indispensable in advanced cutting-edge pulsed power systems and electronic components. However, they typically exhibit lower energy densities compared to other energy storage systems likely batteries and fuel cells. Herein, we propose a novel approach for optimizing the energy storage performance of Bi0.39Na0.36Sr0.25TiO3 (BNST) ceramic through the modification effects of Ca(Nb0.5Al0.5)O3 (CAN). The incorporation of CAN could concurrently achieve a maximum polarization Pmax and breakdown strength. Consequently, the BNST-0.2CAN ceramic achieves a high recoverable energy density (Wrec) ∼ 6.02 J/cm3 accompany with efficiency (η) close to 90 % at 580 kV/cm. This composition also exhibits exceptional frequency stability from 1 Hz to 200 Hz, robust temperature stability from 25 °C to 200 °C, and outstanding cyclic stability exceeding 104 cycles. This work offers a promising pathway to improve the energy storage performance for application in advanced dielectric capacitors.
Published Version
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