High-entropy relaxor ferroelectric ceramics for ultrahigh energy storage

Haonan Peng, Tiantian Wu, Zhen Liu (), Zhengqian Fu, Dong Wang (), Yanshuang Hao, Fangfang Xu, Genshui Wang () and Junhao Chu
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Haonan Peng: Chinese Academy of Sciences
Tiantian Wu: Chinese Academy of Sciences
Zhen Liu: Chinese Academy of Sciences
Zhengqian Fu: Chinese Academy of Sciences
Dong Wang: Xi’an Jiaotong University
Yanshuang Hao: Chinese Academy of Sciences
Fangfang Xu: Chinese Academy of Sciences
Genshui Wang: Chinese Academy of Sciences
Junhao Chu: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Dielectric ceramic capacitors with ultrahigh power densities are fundamental to modern electrical devices. Nonetheless, the poor energy density confined to the low breakdown strength is a long-standing bottleneck in developing desirable dielectric materials for practical applications. In this instance, we present a high-entropy tungsten bronze-type relaxor ferroelectric achieved through an equimolar-ratio element design, which realizes a giant recoverable energy density of 11.0 J·cm−3 and a high efficiency of 81.9%. Moreover, the atomic-scale microstructural study confirms that the excellent comprehensive energy storage performance is attributed to the increased atomic-scale compositional heterogeneity from high configuration entropy, which modulates the relaxor features as well as induces lattice distortion, resulting in reduced polarization hysteresis and enhanced breakdown endurance. This study provides evidence that developing high-entropy relaxor ferroelectric material via equimolar-ratio element design is an effective strategy for achieving ultrahigh energy storage characteristics. Our results also uncover the immense potential of tetragonal tungsten bronze-type materials for advanced energy storage applications.

Date: 2024
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DOI: 10.1038/s41467-024-49107-1

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