Enhanced energy-storage in lead-free multilayer capacitors via entropy-assisted polymorphic domain engineering

Jiaqi Li, Yibing Zhang, Zhen Liu (), Lingling Wei, Haonan Peng, Minghao Liu, Shiguang Yan, Kunyu Zhao, Huarong Zeng (), Zupei Yang () and Genshui Wang ()
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Jiaqi Li: Shaanxi Normal University
Yibing Zhang: Shaanxi Normal University
Zhen Liu: Chinese Academy of Sciences
Lingling Wei: Shaanxi Normal University
Haonan Peng: Chinese Academy of Sciences
Minghao Liu: Chinese Academy of Sciences
Shiguang Yan: Chinese Academy of Sciences
Kunyu Zhao: Chinese Academy of Sciences
Huarong Zeng: Chinese Academy of Sciences
Zupei Yang: Shaanxi Normal University
Genshui Wang: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Lead-free multilayer ceramic capacitors with high energy storage performance are essential components in environmentally sustainable and miniaturized pulsed power systems. However, their practical application is limited by inherently low energy density and suboptimal energy efficiency. In this study, a stepwise dual-site entropy increase strategy is introduced to simultaneously modulate relaxor behavior and enhance the breakdown strength of Bi0.5Na0.5TiO3-based capacitors. Atomic-scale structural analyses reveal that the coexistence of rhombohedral, tetragonal, and cubic polymorphic domains effectively prevents premature polarization saturation while maintaining high maximum polarization. Additionally, the high configurational entropy induces non-periodic lattice distortions, promoting grain refinement and improving electrical resistance, which collectively enhance breakdown endurance. Consequently, an enhanced energy density of 17.8 J cm−3 with a high efficiency of 97.6% is achieved in the high-entropy capacitors. Furthermore, the high-entropy capacitors exhibit excellent thermal and fatigue stability, along with superior charge-discharge performance. This study provides a viable structural design approach for developing high-performance relaxor ferroelectric materials and devices with optimized energy storage characteristics.

Date: 2025
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DOI: 10.1038/s41467-025-63584-y

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