Issue 17, 2019

Design for high energy storage density and temperature-insensitive lead-free antiferroelectric ceramics

Abstract

Dielectric capacitors with high power density and excellent temperature stability are highly demanded in pulsed power systems. AgNbO3-based lead-free antiferroelectric ceramics have been proven to be a promising candidate for energy storage applications. Nevertheless, the recoverable energy storage density (Wrec) still needs to be further improved to meet the requirements of the miniaturization and integration of pulsed power systems. In order to significantly increase Wrec, a strategy, by introducing A-site vacancies, stabilizing antiferroelectricity and decreasing the grain size, is proposed in this work. Here, Ag1−2xCaxNbO3 solid solutions were designed for achieving high maximum polarization (Pmax), large antiferroelectric–ferroelectric electric field (EF) and high breakdown electric field (Eb). A high Pmax of 39.6 μC cm−2, a large EF of 179 kV cm−1 and an Eb of 220 kV cm−1 were achieved in Ag0.92Ca0.04NbO3 ceramics, leading to an ultrahigh Wrec of 3.55 J cm−3. The significantly improved Wrec is about 2 times as high as that of the pure AgNbO3 counterpart. Meanwhile, the Ag0.92Ca0.04NbO3 ceramics exhibited temperature-insensitive Wrec with minimal variation less than 1.5% from room temperature up to 100 °C. A Ginzburg–Landau–Devonshire (GLD) phenomenology was proposed to reveal the increased stability of antiferroelectricity and the temperature-insensitive Wrec, which suggested that they are closely associated with the tailoring of free energy barriers for antiferroelectric–ferroelectric phase transition. The excellent energy storage performance makes the Ag1−2xCaxNbO3 system a good candidate for advanced pulsed power capacitors. More importantly, our findings open a new way for developing high performance AgNbO3-based and other lead-free systems for energy storage.

Graphical abstract: Design for high energy storage density and temperature-insensitive lead-free antiferroelectric ceramics

Article information

Article type
Paper
Submitted
26 дек 2018
Accepted
11 фев 2019
First published
14 фев 2019

J. Mater. Chem. C, 2019,7, 4999-5008

Design for high energy storage density and temperature-insensitive lead-free antiferroelectric ceramics

N. Luo, K. Han, F. Zhuo, L. Liu, X. Chen, B. Peng, X. Wang, Q. Feng and Y. Wei, J. Mater. Chem. C, 2019, 7, 4999 DOI: 10.1039/C8TC06549G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements