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Issue 9, 2020
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Superior energy density through tailored dopant strategies in multilayer ceramic capacitors

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Abstract

The Gerson–Marshall (1959) relationship predicts an increase in dielectric breakdown strength (BDS) and therefore, recoverable energy density (Wrec) with decreasing dielectric layer thickness. This relationship only operates however, if the total resistivity of the dielectric is sufficiently high and the electrical microstructure is homogeneous (no short circuit diffusion paths). BiFeO3–SrTiO3 (BF–ST) is a promising base for developing high energy density capacitors but Bi-rich compositions which have the highest polarisability per unit volume are ferroelectric rather than relaxor and are electrically too conductive. Here, we present a systematic strategy to optimise BDS and maximum polarisation via: (i) Nb-doping to increase resistivity by eliminating hole conduction and promoting electrical homogeneity and (ii) alloying with a third perovskite end-member, BiMg2/3Nb1/3O3 (BMN), to reduce long range polar coupling without decreasing the average ionic polarisability. These strategies result in an increase in BDS to give Wrec = 8.2 J cm−3 at 460 kV cm−1 for BF–ST–0.03Nb–0.1BMN ceramics, which when incorporated in a multilayer capacitor with dielectric layers of 8 μm thickness gives BDS > 1000 kV cm−1 and Wrec = 15.8 J cm−3.

Graphical abstract: Superior energy density through tailored dopant strategies in multilayer ceramic capacitors

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Supplementary files

Article information


Submitted
02 Jul 2020
Accepted
20 Aug 2020
First published
21 Aug 2020

This article is Open Access

Energy Environ. Sci., 2020,13, 2938-2948
Article type
Paper

Superior energy density through tailored dopant strategies in multilayer ceramic capacitors

Z. Lu, G. Wang, W. Bao, J. Li, L. Li, A. Mostaed, H. Yang, H. Ji, D. Li, A. Feteira, F. Xu, D. C. Sinclair, D. Wang, S. Liu and I. M. Reaney, Energy Environ. Sci., 2020, 13, 2938
DOI: 10.1039/D0EE02104K

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