1. Enhanced energy-storage performances in lead-free ceramics via the Co-modulation by conduction effect and domain engineering.
- Author
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Wu, Jianhua, Zhang, Tiantian, Zhao, Hengtong, Han, Pei, Sun, Ningning, Du, Jinhua, Zhang, Liwen, Zhao, Ye, Li, Yong, and Hao, Xihong
- Subjects
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LEAD-free ceramics , *ELECTRIC breakdown , *ENERGY storage , *FERROELECTRIC ceramics , *ENERGY density , *ELECTRIC fields - Abstract
The main factors that limit the practical application of bismuth ferrite-based energy storage ceramics are their low breakdown electric field strength and large remnant polarization. Here, we achieve high energy storage behavior in (0.72-x)BiFeO 3 -0.28BaTiO 3 -xLa(Mg 1/2 Zr 1/2)O 3 (BF-BT-xLMZ) ferroelectric ceramics through directional defect modulation based on a transformation of the conductance mechanisms. The systematic experimental analysis coupled with the vacancy sink model suggests that the introduction of LMZ changes the trap-filled-limit conduction mode dominated by oxygen vacancy, leading to 4 times enhancement of the breakdown electric field in BF-BT-0.2LMZ. Meanwhile, the induced nanodomains create a size effect that effectively reduces the remnant polarization, resulting in an increase in efficiency by 3.5 times. As a result, the recoverable energy storage density of the ceramic reaches an outstanding 4.2 J/cm3, together with a high efficiency of 75.2%. This work provides a feasible strategy for the development of ferroelectric family in the field of high-energy storage. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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