Citation: Kun Wei, Jianhong Duan, Linzhao Ma, Qianbiao Du, Huifen Yu, Xuefan Zhou, Hao Li, He Qi, Dou Zhang. Superior comprehensive performance in sodium niobate-based high-entropy relaxors[J]. Chinese Chemical Letters, ;2026, 37(3): 110728. doi: 10.1016/j.cclet.2024.110728 shu

Superior comprehensive performance in sodium niobate-based high-entropy relaxors

Kun Wei ^a ,
Jianhong Duan ^a ,
Linzhao Ma ^a ,
Qianbiao Du ^a ,
Huifen Yu ^b ,
Xuefan Zhou ^c ,
Hao Li ^{a, *,} ,
He Qi ^{b, *,} ,
Dou Zhang ^{c, *,}

a.
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
b.
Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
c.
Powder Metallurgy Research Institute, State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

hli@hnu.edu.cn

qiheustb@ustb.edu.cn

dzhang@csu.edu.cn

Received Date: 7 November 2024
Revised Date: 5 December 2024
Accepted Date: 5 December 2024
Available Online: 6 December 2024

Figures(5)

Cutting-edge high/pulsed power capacitors with satisfactory power density are fundamental units in modern power storage systems. However, a persistent challenge is how to overcome the trade-off between recoverable energy storage density (W_rec) and efficiency (η) for meeting the miniaturization and integration of advanced applications. Here, multiple local distortions including inhomogeneous functional nanoclusters, (anti)ferro-distortions and highly dynamic polar nanoregions are modulated through a high-entropy strategy to design a stable ergodic-relaxor-state-dominated structure. Of great importance, this strategy delay polarization saturation, reduces hysteresis and improves breakdown strength, so that an ultrahigh W_rec ~11.94 J/cm³ with a η ~ 82.4% is realized in Pb-free ergodic-relaxors. Moreover, a significant Vickers hardness of 10.04 GPa as well as superior temperature, cycling and frequency stabilities are also obtained. This work demonstrates that designing multiple local distortions via a high-entropy strategy is a promising way to realize superior comprehensive energy storage properties in high/pulsed power capacitors.
- Sodium niobate,
- Pb-free,
- Ergodic relaxor state,
- Oxygen octahedral tilt,
- Energy storage performance
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