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<p>To promote the miniaturization and integration of next-generation pulsed electronic devices, it is of significant importance to develop lead-free dielectric ceramic capacitors that can achieve excellent energy storage performance and high reliability under low electric fields (<i>E</i>). In this work, ceramics of (1-<i>x</i>)(Bi<sub>0.5</sub>Na<sub>0.5</sub>)<sub>0.65</sub>(Ba<sub>0.3</sub>Sr<sub>0.7</sub>)<sub>0.35</sub>TiO<sub>3</sub>-<i>x</i>Sr(Ti<sub>0.85</sub>Zr<sub>0.15</sub>)O<sub>3</sub> (<i>x</i> = 0, 0.1, 0.2, 0.3, 0.4), denoted as (1-<i>x</i>)BNBST-<i>x</i>STZ, were prepared via the conventional solid-state method. The microstructure, dielectric and energy storage performance (e.g., stability and charge–discharge behavior) of the synthesized ceramics were systematically investigated. The results show that the introduction of STZ can induce polar nanoregions, refine grain size, reduce oxygen vacancies, and broaden the band gap. Accordingly, the 0.8BNBST-0.2STZ ceramic achieved a high recoverable energy storage density (<i>W</i><sub>rec</sub> = 3.01&#xa0;J/cm<sup>3</sup>) and efficiency (<i>η</i> = 82.9%) under a low electric field of 210&#xa0;kV/cm, while exhibiting a large <i>W</i><sub>rec</sub>/E ratio of 0.0143&#xa0;J(kV⋅cm<sup>2</sup>)<sup>−1</sup>. Moreover, it exhibited excellent energy storage stability across a broad temperature range (20 ~ 160&#xa0;°C), frequency range (1 ~ 100&#xa0;Hz), and cycling endurance (1 ~ 10<sup>5</sup> cycles). Most importantly, it demonstrated high power density (<i>P</i><sub>D</sub> = 51.21&#xa0;MW/cm<sup>3</sup>) and ultrafast charge–discharge rates (<i>t</i><sub>0.9</sub> = 50&#xa0;ns) in pulsed performance. Overall, the 0.8BNBST-0.2STZ ceramic is a potential candidate for dielectric capacitors used under low electric fields.</p>

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Energy storage performance and stability of Sr(Ti0.85Zr0.15)O3-modified BNBST relaxor ferroelectric ceramics under low electric fields

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Jiayi Ma,
  • Kai Li,
  • Yi Sun,
  • Runrun Li,
  • Zong-Yang Shen,
  • Yueming Li,
  • Detian Wan

摘要

To promote the miniaturization and integration of next-generation pulsed electronic devices, it is of significant importance to develop lead-free dielectric ceramic capacitors that can achieve excellent energy storage performance and high reliability under low electric fields (E). In this work, ceramics of (1-x)(Bi0.5Na0.5)0.65(Ba0.3Sr0.7)0.35TiO3-xSr(Ti0.85Zr0.15)O3 (x = 0, 0.1, 0.2, 0.3, 0.4), denoted as (1-x)BNBST-xSTZ, were prepared via the conventional solid-state method. The microstructure, dielectric and energy storage performance (e.g., stability and charge–discharge behavior) of the synthesized ceramics were systematically investigated. The results show that the introduction of STZ can induce polar nanoregions, refine grain size, reduce oxygen vacancies, and broaden the band gap. Accordingly, the 0.8BNBST-0.2STZ ceramic achieved a high recoverable energy storage density (Wrec = 3.01 J/cm3) and efficiency (η = 82.9%) under a low electric field of 210 kV/cm, while exhibiting a large Wrec/E ratio of 0.0143 J(kV⋅cm2)−1. Moreover, it exhibited excellent energy storage stability across a broad temperature range (20 ~ 160 °C), frequency range (1 ~ 100 Hz), and cycling endurance (1 ~ 105 cycles). Most importantly, it demonstrated high power density (PD = 51.21 MW/cm3) and ultrafast charge–discharge rates (t0.9 = 50 ns) in pulsed performance. Overall, the 0.8BNBST-0.2STZ ceramic is a potential candidate for dielectric capacitors used under low electric fields.