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Enhanced energy storage properties in lead-free BaTiO3@Na0.5K0.5NbO3 nano-ceramics with nanodomains via a core–shell structural design

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Abstract

Achieving lead-free bulk ceramics with high energy storage densities has been a long-term goal pursued by researchers. Using a core–shell structural strategy, we achieved high comprehensive energy storage properties in relaxor ferroelectric BaTiO3@Na0.5K0.5NbO3 (BT@KNN) nano-ceramics (194 nm) with rhombohedral and tetragonal nanodomains. The breakdown field strength (211 kV cm−1) was effectively enhanced by ultrafine-grains. Maximum polarization (21.3 μC cm−2) was increased and remanent polarization (3.3 μC cm−2) was reduced by the nanodomain. As a result, the polarization difference reached 18.0 μC cm−2, thus achieving a large energy storage density of 2.24 J cm−3 and a recoverable energy storage density of 1.90 J cm−3 with a high energy storage efficiency of 84.8%. The ceramics exhibit excellent dielectric properties and temperature stability over a wide temperature range (−60–130 °C). This work may provide a theoretical basis for the realization of next generation BT-based lead-free energy storage ceramics in the future.

Graphical abstract: Enhanced energy storage properties in lead-free BaTiO3@Na0.5K0.5NbO3 nano-ceramics with nanodomains via a core–shell structural design

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Article information


Submitted
12 Jan 2020
Accepted
29 Feb 2020
First published
03 Mar 2020

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

Enhanced energy storage properties in lead-free BaTiO3@Na0.5K0.5NbO3 nano-ceramics with nanodomains via a core–shell structural design

Q. Jin, L. Zhao, B. Cui, J. Wang, H. Ma, R. Zhang, Y. Liu and X. Zhang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00179A

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