Superior energy density through tailored dopant strategies in multilayer ceramic capacitors

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LU, Zhilun, WANG, Ge, BAO, Weichao, LI, Jinglei, LI, Linhao, MOSTAED, Ali, YANG, Huijing, JI, Hongfen, LI, Dejun, FETEIRA, Antonio, XU, Fangfang, SINCLAIR, Derek C., WANG, Dawei, LIU, Shi-Yu and REANEY, Ian M (2020). Superior energy density through tailored dopant strategies in multilayer ceramic capacitors. Energy & Environmental Science. [Article]

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27191:557233
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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.
More Information
Open Access URL:
https://pubs.rsc.org/en/content/articlelanding/202...
Uncontrolled Keywords:
Energy
Related URLs:

Identifiers

Identification Number:
10.1039/d0ee02104k
ORCID for Zhilun Lu: ORCID iD orcid.org/0000-0002-9967-5221
ORCID for Ge Wang: ORCID iD orcid.org/0000-0003-1842-8067
ORCID for Linhao Li: ORCID iD orcid.org/0000-0002-9565-9830
ORCID for Ali Mostaed: ORCID iD orcid.org/0000-0002-2443-7819
ORCID for Antonio Feteira: ORCID iD orcid.org/0000-0001-8151-7009
ORCID for Fangfang Xu: ORCID iD orcid.org/0000-0002-0827-4562
ORCID for Derek C. Sinclair: ORCID iD orcid.org/0000-0002-8031-7678
ORCID for Dawei Wang: ORCID iD orcid.org/0000-0001-6957-2494
ORCID for Ian M Reaney: ORCID iD orcid.org/0000-0003-3893-6544

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Item Type:
Article
SWORD Depositor:
Symplectic Elements
Depositing User:
Symplectic Elements
Date Deposited:
10 Sep 2020 16:10
Last Modified:
20 Dec 2024 08:05
Date of first compliant deposit:
10 September 2020
Date of first compliant Open Access:
10 September 2020
Version of first compliant deposit:
Version of Record
URI:
https://shura.shu.ac.uk/id/eprint/27191
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