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<p>Dielectric capacitors are crucial in contemporary electronic devices for storing and recycling electric energy. However, their energy-storage density is significantly hindered by the paradox between polarization (<i>P</i>) and breakdown strength (<i>E</i><sub>b</sub>). Herein, we propose a strategy to overcome the paradox through a unique high-entropy design aimed at regulating phase structure and minimizing interfacial polarization. This approach ensures an ample polar phase while providing a sufficiently high field to induce a transition from antiferroelectric to ferroelectric, significantly enhancing polarization. This strategy has been successfully applied to the Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> (NBT) system, modified by high-entropy material (Na<sub>1/6</sub>Bi<sub>1/6</sub>Ca<sub>1/6</sub>Sr<sub>1/6</sub>Nd<sub>1/6</sub>Li<sub>1/6</sub>)TiO<sub>3</sub> (NBCSNLT). For the (1-<i>x</i>)NBT-<i>x</i>NBCSNLT bulk ceramics, our findings indicate that <i>E</i><sub>b</sub> consistently increases with the NBCSNLT content, effectively resolving the paradox for electric field above 550 kV/cm. This leads to simultaneously high <i>E</i><sub>b</sub> and large <i>P</i>. Consequently, an ultrahigh recoverable energy-storage density (<i>W</i><sub>rec</sub>) of 18.2 J/cm<sup>3</sup>, a high efficiency (<i>η</i>) of 85.6%, and a record-breaking energy-storage potential (<i>W</i><sub>rec</sub>/<i>E</i><sub>b</sub>) value of 0.026 mC/cm<sup>2</sup>, were achieved in the bulk 0.55NBCSNLT. Additionally, this sample exhibited excellent temperature/frequency stability. This strategy provides an effective pathway for surmounting the <i>P</i>-<i>E</i><sub>b</sub> paradox, paving the way for ultrahigh energy-storage density.</p>

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Breaking polarization-breakdown strength paradox for ultrahigh energy storage density in NBT-based ceramics

  • 期刊论文

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  • 发表日期：

    2025年7月7日

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  • Wenjun Cao,
  • Yanwei Wu,
  • Xiaoyu Yang,
  • Daqin Guan,
  • Xuecen Huang,
  • Feng Li,
  • Youmin Guo,
  • Chunchang Wang,
  • Binghui Ge,
  • Xu Hou,
  • Zhenxiang Cheng

摘要

Dielectric capacitors are crucial in contemporary electronic devices for storing and recycling electric energy. However, their energy-storage density is significantly hindered by the paradox between polarization (P) and breakdown strength (Eb). Herein, we propose a strategy to overcome the paradox through a unique high-entropy design aimed at regulating phase structure and minimizing interfacial polarization. This approach ensures an ample polar phase while providing a sufficiently high field to induce a transition from antiferroelectric to ferroelectric, significantly enhancing polarization. This strategy has been successfully applied to the Na0.5Bi0.5TiO3 (NBT) system, modified by high-entropy material (Na1/6Bi1/6Ca1/6Sr1/6Nd1/6Li1/6)TiO3 (NBCSNLT). For the (1-x)NBT-xNBCSNLT bulk ceramics, our findings indicate that Eb consistently increases with the NBCSNLT content, effectively resolving the paradox for electric field above 550 kV/cm. This leads to simultaneously high Eb and large P. Consequently, an ultrahigh recoverable energy-storage density (Wrec) of 18.2 J/cm3, a high efficiency (η) of 85.6%, and a record-breaking energy-storage potential (Wrec/Eb) value of 0.026 mC/cm2, were achieved in the bulk 0.55NBCSNLT. Additionally, this sample exhibited excellent temperature/frequency stability. This strategy provides an effective pathway for surmounting the P-Eb paradox, paving the way for ultrahigh energy-storage density.