Abstract
Electrostatic energy storage technology based on dielectrics is the basis of advanced electronics and high-power electrical systems. High polarization (<i>P</i>) and high electric breakdown strength (<i>E</i><sub>b</sub>) are the key parameters for dielectric materials to achieve superior energy storage performance. In this work, a composite strategy based on antiferroelectric dielectrics (AFEs) has been proposed to improve the energy storage performance. Here, AlN is selected as the second phase for the (Pb<sub>0.915</sub>Ba<sub>0.04</sub>La<sub>0.03</sub>)(Zr<sub>0.65</sub>Sn<sub>0.3</sub>Ti<sub>0.05</sub>)O<sub>3</sub> (PBLZST) AFEs, which is embedded in the grain boundaries to construct insulating networks and regulate the local electric field, improving the <i>E</i><sub>b</sub>. Meanwhile, it is emphasized that AFEs have the AFE–FE and FE–AFE phase transitions, and the increase of the phase transition electric fields can further improve the recoverable energy density (<i>W</i><sub>rec</sub>). As a result, the <i>E</i><sub>b</sub> increases from 180 to 290 kV·cm<sup>−1</sup> with a simultaneous increase of the phase transition electric fields, magnifying the <i>W</i><sub>rec</sub> to ~144% of the pristine PBLZST. The mechanism for enhanced <i>E</i><sub>b</sub> and the phase transition electric fields is revealed by the finite element simulation method. Moreover, the PBLZST:1.0 wt% AlN composite ceramics exhibit favorable temperature stability, frequency stability, and charge–discharge ability, making the composite ceramics a promising candidate for energy storage applications.
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