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Giant energy storage efficiency and high recoverable energy storage density achieved in K0.5Na0.5NbO3-Bi(Zn0.5Zr0.5)O3 ceramics

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Abstract

K0.5Na0.5NbO3 (KNN)-based ceramics, as promising candidate materials that could replace lead-based ceramics, exhibit outstanding potential in pulsed power systems due to their large dielectric constant, high Curie temperature and environmental friendliness. Although a large amount of KNN-based ceramics with high recoverable energy storage density (Wrec) have been designed for energy storage applications, the relatively low energy storage efficiency (η) limits their further development. In this work, a record high for η (86.8%) and a giant Wrec (3.50 J cm−3) were simultaneously obtained in the 0.85K0.5Na0.5NbO3-0.15Bi(Zn0.5Zr0.5)O3 (0.85KNN-0.15BZZ) ceramic, thanks to the introduction of Bi(Zn0.5Zr0.5)O3 (BZZ), which increased the relaxation behavior and enhanced the breakdown strength (BDS). Furthermore, desirable Wrec and η with a variation of less than 10% can be accordingly obtained in the temperature range of 20–120 °C. More importantly, it can be confirmed by the first-order reversal curve (FORC) distribution that the outstanding energy storage performances of the 0.85KNN-0.15BZZ ceramic should be ascribed to its desirable relaxor ferroelectric performances. In addition, the 0.85KNN-0.15BZZ ceramic displays excellent pulsed charging–discharging performances with an outstanding power density of 33.76 MW cm−3, a current density of 562.63 A cm−2 and a fast discharge speed (t0.9 = 114.6 ns). The results reveal that the 0.85KNN-0.15BZZ ceramic is an attractive candidate material for next-generation dielectric capacitors.

Graphical abstract: Giant energy storage efficiency and high recoverable energy storage density achieved in K0.5Na0.5NbO3-Bi(Zn0.5Zr0.5)O3 ceramics

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Article information


Submitted
05 Apr 2020
Accepted
23 May 2020
First published
26 May 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Giant energy storage efficiency and high recoverable energy storage density achieved in K0.5Na0.5NbO3-Bi(Zn0.5Zr0.5)O3 ceramics

M. Zhang, H. Yang, D. Li, L. Ma and Y. Lin, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC01711F

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