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<p>High-performance dielectric ceramic capacitors hold immerse potential for advanced electronics and high-power electrical systems. However, achieving both high recoverable energy density (<i>W</i><sub>rec</sub>) and high energy efficiency (<i>η</i>) remains a critical challenge in bulk dielectric ceramics. Herein, we propose a triple-synergistic strategy that integrates medium-entropy superparaelectric design, local structural distortion, and plate-like secondary bismuth titanate phase construction in SrTiO<sub>3</sub>-based dielectric ceramics. This approach effectively promotes the formation of polymorphic polar nano-regions with short-range polar vectors, enhancing dynamic polarization response. Simultaneously, the introduction of a plate-like secondary bismuth titanate phase within the perovskite matrix significantly increases the breakdown field strength (<i>E</i><sub>b</sub>) by inhibiting breakdown-path propagation. The resulting medium-entropy superparaelectric exhibits a nearly hysteresis-free <i>P-E</i> loop, combined with an ultrahigh <i>E</i><sub>b</sub> and high polarization. Notably, the material achieves a remarkable <i>W</i><sub>rec</sub> of 10.31 J/cm<sup>3</sup> along with an ultrahigh <i>η</i> of 90.9%. Furthermore, it demonstrates outstanding charge/discharge performance, excellent thermal stability and robust cycling stability, making it a highly promising candidate for energy storage applications. This study provides a feasible and innovative design strategy for high-performance bulk dielectrics, paving the way for the development of eco-friendly dielectric capacitors for next-generation energy storage systems.</p>

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Breakthrough energy storage in medium-entropy superparaelectrics by triple synergy strategy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月15日

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  • Yang Liu,
  • Jiarui Wang,
  • Lulu Liu,
  • Jigong Hao,
  • Peng Li,
  • Zhongbin Pan,
  • Jianli Wang,
  • Min Zhang,
  • Limei Zheng,
  • Hairui Bai,
  • Song Chen,
  • Wei Li,
  • Zhenxiang Cheng

摘要

High-performance dielectric ceramic capacitors hold immerse potential for advanced electronics and high-power electrical systems. However, achieving both high recoverable energy density (Wrec) and high energy efficiency (η) remains a critical challenge in bulk dielectric ceramics. Herein, we propose a triple-synergistic strategy that integrates medium-entropy superparaelectric design, local structural distortion, and plate-like secondary bismuth titanate phase construction in SrTiO3-based dielectric ceramics. This approach effectively promotes the formation of polymorphic polar nano-regions with short-range polar vectors, enhancing dynamic polarization response. Simultaneously, the introduction of a plate-like secondary bismuth titanate phase within the perovskite matrix significantly increases the breakdown field strength (Eb) by inhibiting breakdown-path propagation. The resulting medium-entropy superparaelectric exhibits a nearly hysteresis-free P-E loop, combined with an ultrahigh Eb and high polarization. Notably, the material achieves a remarkable Wrec of 10.31 J/cm3 along with an ultrahigh η of 90.9%. Furthermore, it demonstrates outstanding charge/discharge performance, excellent thermal stability and robust cycling stability, making it a highly promising candidate for energy storage applications. This study provides a feasible and innovative design strategy for high-performance bulk dielectrics, paving the way for the development of eco-friendly dielectric capacitors for next-generation energy storage systems.