| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Improved energy storage performance by doping linear dielectrics into lead-free NaNbO3-based ceramics |
| Yunfeng Guo(郭云凤), Junxian Wang(王俊贤), Xiangkai Zhu(朱香开), Yuxuan Ren(任宇轩), Liming Chen(陈立明), and Jiamao Li(李家茂)† |
| Advanced Ceramics Research Center, School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243032, China |
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Abstract NaNbO$_{3}$-based lead-free dielectric ceramics possess significant application prospects in the field of dielectric capacitors. However, their development is hindered by low recoverable energy storage density ($W_{\rm rec}$) and energy storage efficiency ($\eta $). Herein, novel NaNbO$_{3}$-based ceramics, ($1-x$) [0.7Na$_{0.97}$Sm$_{0.01}$NbO$_{3}$-0.3(Sr$_{0.7}$Bi$_{0.2}$)(Ti$_{0.8}$Zr$_{0.2}$)O$_{3}$]-$x$CaTiO$_{3}$, were created by adding CaTiO$_{3}$ linear dielectric, aiming to improve their energy storage performance (ESP). The phase structure, microstructure, dielectric properties, energy storage and charge-discharge performances of the ceramics were methodically analyzed. All components of the ceramics exhibit a perovskite structure consisting of two phases: antiferroelectric $P$-phase (AFE $P$) and antiferroelectric $R$-phase (AFE $R)$, with the AFE $R$ phase increasing as $x$ rises. All ceramic surfaces exhibit clear grain morphology. The resultant ceramics have an appropriate dielectric constant and a small dielectric loss, which are beneficial for improving breakdown field strength ($E_{\rm b}$). Finally, at an $E_{\rm b}$ of 470 kV/cm, 0.85[0.7Na$_{0.97}$Sm$_{0.01}$NbO$_{3}$-0.3(Sr$_{0.7}$Bi$_{0.2}$)(Ti$_{0.8}$Zr$_{0.2}$)O$_{3}$]- 0.15CaTiO$_3$ ceramic achieves optimal ESP: $W_{\rm rec} = 3.9 $ J/cm$^{3}$, $\eta = 72.49$%. In addition, it has remarkable stability with temperature and frequency in energy storage and displays ultrafast speed in the charge-discharge process ($t_{0.9} = 27$ ns).
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Received: 24 April 2025
Revised: 15 June 2025
Accepted manuscript online: 15 July 2025
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PACS:
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77.84.-s
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(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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77.22.-d
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(Dielectric properties of solids and liquids)
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| Fund: Project supported by the Natural Science Foundation of Anhui Provincial Education Department (Grant No. KJ2019A0054). |
Corresponding Authors:
Jiamao Li
E-mail: lijiamao@ahut.edu.cn
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Cite this article:
Yunfeng Guo(郭云凤), Junxian Wang(王俊贤), Xiangkai Zhu(朱香开), Yuxuan Ren(任宇轩), Liming Chen(陈立明), and Jiamao Li(李家茂) Improved energy storage performance by doping linear dielectrics into lead-free NaNbO3-based ceramics 2026 Chin. Phys. B 35 027703
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