Large Energy Capacitive High-Entropy Lead-Free Ferroelectrics

Liang Chen; Huifen Yu; Jie Wu; Shiqing Deng; Hui Liu; Lifeng Zhu; He Qi; Jun Chen

doi:10.1007/s40820-023-01036-2

Large Energy Capacitive High-Entropy Lead-Free Ferroelectrics

Nanomicro Lett. 2023 Mar 10;15(1):65. doi: 10.1007/s40820-023-01036-2.

Authors

Liang Chen¹, Huifen Yu^{1

2}, Jie Wu^{1

2}, Shiqing Deng^{1

2}, Hui Liu^{1

2}, Lifeng Zhu³, He Qi⁴, Jun Chen⁵

Affiliations

¹ Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
² School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
³ School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China.
⁴ Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China. qiheustb@ustb.edu.cn.
⁵ Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China. junchen@ustb.edu.cn.

Abstract

Advanced lead-free energy storage ceramics play an indispensable role in next-generation pulse power capacitors market. Here, an ultrahigh energy storage density of ~ 13.8 J cm^-3 and a large efficiency of ~ 82.4% are achieved in high-entropy lead-free relaxor ferroelectrics by increasing configuration entropy, named high-entropy strategy, realizing nearly ten times growth of energy storage density compared with low-entropy material. Evolution of energy storage performance and domain structure with increasing configuration entropy is systematically revealed for the first time. The achievement of excellent energy storage properties should be attributed to the enhanced random field, decreased nanodomain size, strong multiple local distortions, and improved breakdown field. Furthermore, the excellent frequency and fatigue stability as well as charge/discharge properties with superior thermal stability are also realized. The significantly enhanced comprehensive energy storage performance by increasing configuration entropy demonstrates that high entropy is an effective but convenient strategy to design new high-performance dielectrics, promoting the development of advanced capacitors .

Keywords: Capacitors; Energy storage; High-entropy; Lead-free; Relaxor ferroelectrics.