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<p>Multilayer ceramic capacitors are pivotal components in pulse power systems due to their ultra-high power density. However, given the demanding service conditions in aerospace and oil drilling applications, the need to enhance high-temperature energy storage remains particularly urgent. In this work, we employ a strain modulation strategy by enhancing configuration entropy within bismuth sodium titanate-based ceramics. This approach enhances relaxor behavior, suppresses electron migration, and improves structural stability and breakdown strength at elevated temperatures. Notably, the resulting multilayer ceramic capacitors exhibit a substantial recoverable energy density of 19.0 J cm<sup>−3</sup> and an impressive efficiency of 90% under an electric field of 1320 kV cm<sup>−1</sup>. Furthermore, these capacitors sustain a high energy density above 11.0 J cm<sup>−3</sup> even at 200 °C. This extraordinary high-temperature energy storage performance surpasses those of recently reported multilayer ceramic capacitors. Our findings underscore the significant potential of strain modulation as a strategy for designing high-temperature energy storage materials.</p>

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Ultra-high energy storage in relaxor ferroelectric MLCCs at elevated temperatures via entropy modulated strain heterogeneity

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月13日

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  • Ruirui Kang,
  • Yang Li,
  • Tengfei Hu,
  • Zepeng Wang,
  • Yangfei Gao,
  • Junbo Xu,
  • Mei Bai,
  • Zhengqian Fu,
  • Lixue Zhang,
  • Jiantuo Zhao,
  • Danyang Wang,
  • Jinyou Shao,
  • Fei Li,
  • Shujun Zhang,
  • Xiaojie Lou

摘要

Multilayer ceramic capacitors are pivotal components in pulse power systems due to their ultra-high power density. However, given the demanding service conditions in aerospace and oil drilling applications, the need to enhance high-temperature energy storage remains particularly urgent. In this work, we employ a strain modulation strategy by enhancing configuration entropy within bismuth sodium titanate-based ceramics. This approach enhances relaxor behavior, suppresses electron migration, and improves structural stability and breakdown strength at elevated temperatures. Notably, the resulting multilayer ceramic capacitors exhibit a substantial recoverable energy density of 19.0 J cm−3 and an impressive efficiency of 90% under an electric field of 1320 kV cm−1. Furthermore, these capacitors sustain a high energy density above 11.0 J cm−3 even at 200 °C. This extraordinary high-temperature energy storage performance surpasses those of recently reported multilayer ceramic capacitors. Our findings underscore the significant potential of strain modulation as a strategy for designing high-temperature energy storage materials.