Multilayer ceramic capacitors (MLCCs) are attracting great interest recently, especially in energy-storage applications due to their high volumetric capacitance, high power density, and fast charge-discharge capability. However, the low dielectric breakdown strength of ferroelectric ceramics always leads to a low discharge energy density, which limits their applications in high-voltage energy-storage systems. In this work, a phase-field electromechanical breakdown model is introduced to give a fundamental understanding of the dielectric breakdown behavior of MLCCs and provide a resource-efficient design strategy for the structure of MLCCs to enhance their dielectric breakdown strength and discharge energy density. Three types of margin lengths of 100 , 200 , and 400 are designed and applied on the MLCCs consisting of ten dielectric layers with the single-layer thickness of 11 , to confirm and practice our phase-field breakdown model. A large discharge energy density of 7.8 J cm−3 can be achieved under the applied electric field of 790 kV/cm, together with a high efficiency of 88% in a 400 -margin-length MLCC.
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8 July 2019
Research Article|
July 09 2019
Significantly enhanced dielectric breakdown strength and energy density of multilayer ceramic capacitors with high efficiency by electrodes structure design
Ziming Cai
;
Ziming Cai
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Hongxian Wang;
Hongxian Wang
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Peiyao Zhao;
Peiyao Zhao
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Lingling Chen;
Lingling Chen
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Chaoqiong Zhu;
Chaoqiong Zhu
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Kezhen Hui;
Kezhen Hui
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Longtu Li;
Longtu Li
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
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Xiaohui Wang
Xiaohui Wang
a)
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University
, Beijing 100084, China
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 115, 023901 (2019)
Article history
Received:
May 17 2019
Accepted:
June 23 2019
Citation
Ziming Cai, Hongxian Wang, Peiyao Zhao, Lingling Chen, Chaoqiong Zhu, Kezhen Hui, Longtu Li, Xiaohui Wang; Significantly enhanced dielectric breakdown strength and energy density of multilayer ceramic capacitors with high efficiency by electrodes structure design. Appl. Phys. Lett. 8 July 2019; 115 (2): 023901. https://doi.org/10.1063/1.5110527
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