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Research Article | Open Access

Structure, dielectric and relaxor properties of Sr0.7Bi0.2TiO3-K0.5Bi0.5TiO3 lead-free ceramics for energy storage applications

Peng Zhaoa,b, Bin Tanga,b, Zixuan Fanga,b(), Feng Sia,b, Chengtao Yanga,b, Gang Liuc(), Shuren Zhanga,b
National Engineering Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu, 610054, China
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China
School of Materials and Energy, Southwest University, Chongqing, 400715, China

Peer review under responsibility of The Chinese Ceramic Society.

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Highlights

• Pmax can be greatly improved with increasing KBT content.

• The introduction of KBT with large band gap compensates the deterioration of BDS.

• 0.62SBT-0.38KBT shows high W (2.21 J/cm3) and η (91.4%) at high BDS (220 kV/cm).

• 0.62SBT-0.38KBT exhibits both high Wd (1.81 J/cm3) and PD (49.5 MW/cm3).

• 0.62SBT-0.38KBT shows excellent stability of temperature, frequency and cycling.

Graphical Abstract

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Abstract

Sr0.7Bi0.2TiO3 (SBT) by increasing the proportion and size of polar nano-region. Meanwhile, the BDS remains a high level with x ≤ 0.38 attributed to the addition of KBT with a large band gap. As a result, the 0.62SBT-0.38KBT exhibits a high energy storage density of 2.21 J/cm3 with high η of 91.4% at 220 kV/cm and superior temperature stability (−55 ~ 150 °C), frequency stability (10 ~ 500 Hz) and fatigue resistance (105 cycles). Moreover, high pulsed discharge energy density (1.81 J/cm3), high power density (49.5 MW/cm3) and great thermal stability (20 ~ 160 °C) are achieved in 0.62SBT-0.38KBT. Based on these excellent properties, the 0.62SBT-0.38KBT are suitable for pulsed power systems. This work provides a novel strategy and systematic study for improving energy storage properties of SBT.

Keywords

Energy storage(Sr0.7Bi0.2)TiO3K0.5Bi0.5TiO3Lead-freeRelaxor ferroelectricsMaximum polarization

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Journal of Materiomics
Volume 7 Issue 1,
January 2021
Pages 195-207
DOI: 10.1016/j.jmat.2020.07.009
Cite this article:
Zhao P, Tang B, Fang Z, et al. Structure, dielectric and relaxor properties of Sr0.7Bi0.2TiO3-K0.5Bi0.5TiO3 lead-free ceramics for energy storage applications. Journal of Materiomics, 2021, 7(1): 195-207. https://doi.org/10.1016/j.jmat.2020.07.009
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