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<p>The development of dielectric ceramics that simultaneously achieve high energy density and ultra-broad temperature stability remains a fundamental challenge for advanced electrostatic capacitors. Here, we report a high-entropy engineering strategy that transforms conventional relaxor ferroelectric BT-Bi(Mg<sub>0.5</sub>Zr<sub>0.5</sub>)O<sub>3</sub> into entropy-stabilized BT-H through a dual-phase cationic disorder modulation. By maximizing configurational entropy, this approach induces atomic-scale lattice heterogeneity with reduced size of polar units, and establishes temperature-adaptive multiphase coexistence structure, effectively decoupling polarization configuration from thermal fluctuations. Consequently, the optimized BT-H ceramics exhibit extraordinary recoverable energy density (W<sub>rec</sub>) of 8.9 J cm<sup>-3</sup>, near ideal conversion efficiency (η) of ~ 97.8 % and superior temperature stability of ΔW<sub>rec</sub> ~±9 % and Δη ~ ±4.8% over a ultrawide operational range (−85-220 °C). This work validates the entropy-mediated cocktail effect, demonstrating that leveraging high-entropy materials to design capacitors with superior integrated energy storage performance is an advanced and viable strategy.</p>

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Ultrawide-temperature-stable high-entropy relaxor ferroelectrics for energy-efficient capacitors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月26日

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  • Shiyu Zhou,
  • Yucheng Zhou,
  • Linhai Li,
  • Zhenhao Fan,
  • Wenfeng Yue,
  • Zhengqian Fu,
  • Xuefeng Chen,
  • Baixiang Xu,
  • Tengfei Hu,
  • Dawei Wang,
  • Tongqing Yang

摘要

The development of dielectric ceramics that simultaneously achieve high energy density and ultra-broad temperature stability remains a fundamental challenge for advanced electrostatic capacitors. Here, we report a high-entropy engineering strategy that transforms conventional relaxor ferroelectric BT-Bi(Mg0.5Zr0.5)O3 into entropy-stabilized BT-H through a dual-phase cationic disorder modulation. By maximizing configurational entropy, this approach induces atomic-scale lattice heterogeneity with reduced size of polar units, and establishes temperature-adaptive multiphase coexistence structure, effectively decoupling polarization configuration from thermal fluctuations. Consequently, the optimized BT-H ceramics exhibit extraordinary recoverable energy density (Wrec) of 8.9 J cm-3, near ideal conversion efficiency (η) of ~ 97.8 % and superior temperature stability of ΔWrec ~±9 % and Δη ~ ±4.8% over a ultrawide operational range (−85-220 °C). This work validates the entropy-mediated cocktail effect, demonstrating that leveraging high-entropy materials to design capacitors with superior integrated energy storage performance is an advanced and viable strategy.