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<p>Multilayer ceramic capacitors with ultra-high-power densities are widely used in electronic power systems. However, achieving a balance between high energy density and efficiency remains a substantial challenge that limits the practical application of advanced technologies. Here, guided by a phase-field simulation method, we propose a directional slush-like polar structure design with nanodomains embedded in polar orthorhombic matrix in NaNbO<sub>3</sub>-based lead-free multilayer ceramic capacitors. This strategy can effectively reduce the hysteresis loss by lowering domain size and improve the breakdown electric field by grain refining, which leads to a high energy storage density of 14.1 J▪cm<sup>−3</sup> and an ultrahigh energy storage efficiency of 96.8% in multilayer ceramic capacitors. The proposed strategy can be utilized to design high-performance energy storage dielectrics and other related functionalities.</p>

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Ultra-high energy storage in lead-free NaNbO3-based relaxor ceramics with directional slush-like polar structures design

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月25日

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  • Zhentao Wang,
  • Da Li,
  • Wenyuan Liu,
  • Liqiang He,
  • Diming Xu,
  • Jinnan Liu,
  • Jiajia Ren,
  • Xin Wang,
  • Yang Liu,
  • Guoqiang He,
  • Jian Bao,
  • Zhen Fang,
  • Guiwei Yan,
  • Xu Liang,
  • Tao Zhou,
  • Weichen Zhao,
  • Wenfeng Liu,
  • Dong Wang,
  • Di Zhou

摘要

Multilayer ceramic capacitors with ultra-high-power densities are widely used in electronic power systems. However, achieving a balance between high energy density and efficiency remains a substantial challenge that limits the practical application of advanced technologies. Here, guided by a phase-field simulation method, we propose a directional slush-like polar structure design with nanodomains embedded in polar orthorhombic matrix in NaNbO3-based lead-free multilayer ceramic capacitors. This strategy can effectively reduce the hysteresis loss by lowering domain size and improve the breakdown electric field by grain refining, which leads to a high energy storage density of 14.1 J▪cm−3 and an ultrahigh energy storage efficiency of 96.8% in multilayer ceramic capacitors. The proposed strategy can be utilized to design high-performance energy storage dielectrics and other related functionalities.