Novel BaTiO3-based, Ag/Pd compatible lead-free relaxors with superior energy storage performance

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YANG, Hui-Jing, LU, Zhilun, LI, Linhao, BAO, Weichao, JI, Hongfen, LI, Jinglei, FETEIRA, Antonio, XU, Fangfang, ZHANG, Yong, SUN, Huajun, HUANG, Zhichao, LOU, Weichao, SONG, Kaixin, SUN, Shikuan, WANG, Ge, WANG, Dawei and REANEY, Ian M (2020). Novel BaTiO3-based, Ag/Pd compatible lead-free relaxors with superior energy storage performance. ACS Applied Materials and Interfaces. [Article]

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Abstract

Ceramic dielectrics are reported with superior energy storage performance for applications, such as power electronics in electrical vehicles. A recoverable energy density (Wrec) of ∼4.55 J cm–3 with η ∼ 90% is achieved in lead-free relaxor BaTiO3-0.06Bi2/3(Mg1/3Nb2/3)O3 ceramics at ∼520 kV cm–1. These ceramics may be co-fired with Ag/Pd, which constitutes a major step forward toward their potential use in the fabrication of commercial multilayer ceramic capacitors. Compared to stoichiometric Bi(Mg2/3Nb1/3)O3-doped BaTiO3 (BT), A-site deficient Bi2/3(Mg1/3Nb2/3)O3 reduces the electrical heterogeneity of BT. Bulk conductivity differs from the grain boundary only by 1 order of magnitude which, coupled with a smaller volume fraction of conducting cores due to enhanced diffusion of the dopant via A-site vacancies in the A-site sublattice, results in higher breakdown strength under an electric field. This strategy can be employed to develop new dielectrics with improved energy storage performance.

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Official URL:

https://pubs.acs.org/doi/10.1021/acsami.0c13057

Open Access URL:

https://pubs.acs.org/doi/pdf/10.1021/acsami.0c1305...

Open Access Version:

Published version

Uncontrolled Keywords:

03 Chemical Sciences; 09 Engineering; Nanoscience & Nanotechnology

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Identification Number:

10.1021/acsami.0c13057