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<p>NaNbO<sub>3</sub> (NN)-based antiferroelectric ceramics, with their superior dielectric properties, have positioned themselves as prominent candidates in the field of lead-free capacitor energy storage. However, energy storage properties (ESPs) are still low and limited by low recoverable energy storage density (<i>W</i><sub>rec</sub>) and energy storage efficiency (<i>η</i>). The pursuit of concurrent enhancement in both <i>W</i><sub>rec</sub> and <i>η</i> presents a significant challenge in material design. In this work, the Bi-rich unit Bi(Mg<sub>2/3</sub>Nb<sub>1/6</sub>Ta<sub>1/6</sub>)O<sub>3</sub> (BMNT) was introduced into the NaNbO<sub>3</sub> matrix to improve the maximum polarization (<i>P</i><sub>max</sub>), reduce the remanent polarization (<i>P</i><sub>r</sub>), and reduce the polarization saturation of the ceramics by regulating the microstructure, resulting in more obvious relaxation behavior, thereby improving the ESPs. Therefore, the NN-0.15BMNT ceramic achieved a <i>W</i><sub>rec</sub> of 3.56&#xa0;J/cm<sup>3</sup> and an <i>η</i> of 87.13% at a medium electric field of 460&#xa0;kV/cm. Meanwhile, the optimal ceramic exhibits remarkable stability under varying temperature (30–100&#xa0;°C) and frequency (1–200&#xa0;Hz) conditions. Collectively, this work demonstrates a viable strategy for fabricating advanced energy storage materials with superior overall properties.</p>

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Relaxation enhancement via bismuth-based unit modified for high-performance NaNbO3-based energy storage ceramics

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Ying Li,
  • Shenda Chen,
  • Wenna Chao,
  • Zhe Wang,
  • Yan Zhao,
  • Juan Du,
  • Wei Li

摘要

NaNbO3 (NN)-based antiferroelectric ceramics, with their superior dielectric properties, have positioned themselves as prominent candidates in the field of lead-free capacitor energy storage. However, energy storage properties (ESPs) are still low and limited by low recoverable energy storage density (Wrec) and energy storage efficiency (η). The pursuit of concurrent enhancement in both Wrec and η presents a significant challenge in material design. In this work, the Bi-rich unit Bi(Mg2/3Nb1/6Ta1/6)O3 (BMNT) was introduced into the NaNbO3 matrix to improve the maximum polarization (Pmax), reduce the remanent polarization (Pr), and reduce the polarization saturation of the ceramics by regulating the microstructure, resulting in more obvious relaxation behavior, thereby improving the ESPs. Therefore, the NN-0.15BMNT ceramic achieved a Wrec of 3.56 J/cm3 and an η of 87.13% at a medium electric field of 460 kV/cm. Meanwhile, the optimal ceramic exhibits remarkable stability under varying temperature (30–100 °C) and frequency (1–200 Hz) conditions. Collectively, this work demonstrates a viable strategy for fabricating advanced energy storage materials with superior overall properties.