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Enhanced energy storage properties in sodium bismuth titanate-based ceramics for dielectric capacitor applications

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Abstract

There are imperious demands for developing eco-benign energy storage materials with high-performance in a sustainable society. In this paper, we introduce Sr0.85Bi0.1□0.05TiO3 (SBT) and NaNbO3 (NN) into Bi0.5Na0.5TiO3 (BNT) ceramics through compositional design. The introduction of Sr2+ ions and vacancies at the A-sites constructs relaxor ferroelectrics according to order–disorder theory. The introduction of Nb5+ ions at the B-sites is confirmed to have two major implications. In one way, it boosts a higher induced polarization due to its intrinsic larger polarizability and overall stronger degree of diffuseness. In another, it contributes to forming a core–shell microstructure, as proven using transmission electron microscopy, promoting the breakdown strength (BDS) to a higher level. With the above strategies, our BNT–SBT–4NN ceramics demonstrate excellent energy storage performances with simultaneously ultrahigh energy storage density (W ∼ 3.78 J cm−3), recoverable energy storage density (Wrec ∼ 3.08 J cm−3) and efficiency (81.4%). Furthermore, the ceramics possess excellent discharge energy density (Wd = 0.854 J cm−3) and rapid discharge speed (t0.9 ∼ 100 ns) in a wide temperature range, proving their high application potential. Our results break through the bottleneck of BNT-based ferroelectrics with a general recoverable energy storage density of lower than 3 J cm−3, making the BNT–SBT–4NN ceramic a powerful candidate material for use in energy storage applications.

Graphical abstract: Enhanced energy storage properties in sodium bismuth titanate-based ceramics for dielectric capacitor applications

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Publication details

The article was received on 06 Mar 2019, accepted on 23 Apr 2019 and first published on 24 Apr 2019


Article type: Communication
DOI: 10.1039/C9TC01239G
J. Mater. Chem. C, 2019, Advance Article

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    Enhanced energy storage properties in sodium bismuth titanate-based ceramics for dielectric capacitor applications

    Y. Wu, Y. Fan, N. Liu, P. Peng, M. Zhou, S. Yan, F. Cao, X. Dong and G. Wang, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC01239G

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