Engineering relaxors by entropy for high energy storage performance

Bingbing Yang, Qinghua Zhang, Houbing Huang, Hao Pan, Wenxuan Zhu, Fanqi Meng, Shun Lan, Yiqian Liu, Bin Wei, Yiqun Liu, Letao Yang, Lin Gu, Long-Qing Chen, Ce-Wen Nan () and Yuan-Hua Lin ()
Additional contact information
Bingbing Yang: Tsinghua University
Qinghua Zhang: Chinese Academy of Sciences
Houbing Huang: Beijing Institute of Technology
Hao Pan: University of California, Berkeley
Wenxuan Zhu: Beijing Institute of Technology
Fanqi Meng: Tsinghua University
Shun Lan: Tsinghua University
Yiqian Liu: Tsinghua University
Bin Wei: Tsinghua University
Yiqun Liu: Tsinghua University
Letao Yang: Tsinghua University
Lin Gu: Tsinghua University
Long-Qing Chen: The Pennsylvania State University
Ce-Wen Nan: Tsinghua University
Yuan-Hua Lin: Tsinghua University

Nature Energy, 2023, vol. 8, issue 9, 956-964

Abstract: Abstract Relaxor ferroelectrics are the primary candidates for high-performance energy storage dielectric capacitors. A common approach to tuning the relaxor properties is to regulate the local compositional inhomogeneity, but there is a lack of a quantitative evaluation way for compositional fluctuation in relaxors. Here we propose configurational entropy as an index for the quantitative evaluation of local compositional inhomogeneity. Our results reveal that the local inhomogeneity increases with the entropy via scanning transmission electron microscopy, and relaxor features are accordingly modulated. With the deliberate design of entropy, we achieve an optimal overall energy storage performance in Bi4Ti3O12-based medium-entropy films, featuring a high energy density of 178.1 J cm−3 with efficiency exceeding 80% and a high figure of merit of 913. By using the medium-entropy films as dielectric layers, we demonstrate a multilayer film capacitor prototype that outperforms conventional multilayer ceramic capacitors.

Date: 2023
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DOI: 10.1038/s41560-023-01300-0

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