Superior energy density through tailored dopant strategies in multilayer ceramic capacitors

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.

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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.

Item Type: Article
Uncontrolled Keywords: Energy
Identification Number:
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 10 Sep 2020 16:10
Last Modified: 17 Mar 2021 23:00

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