Achieving ultrahigh energy storage density in super relaxor BCZT-based lead-free capacitors through multiphase coexistence

Author:

Bai Yuhan1ORCID,Ouyang Tao2ORCID,Guo Qing1ORCID,Ning Yating2,Liu Jiaqi3ORCID,Wei Hansong3,Du Kang4,Jing Hongmei5,Tian Ye6ORCID,Pu Yongping2ORCID

Affiliation:

1. School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology 1 , Xi'an 710021, People's Republic of China

2. Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology 5 , Xi'an 710021, People's Republic of China

3. Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Shaanxi University of Science and Technology 6 , Xi'an 710021, People's Republic of China

4. School of Mathematical and Physical Sciences, Wuhan Textile University 7 , Wuhan 430200, China

5. School of Physics and Information Technology, Shaanxi Normal University 8 , Xi'an 710119, People's Republic of China

6. School of Materials Science and Engineering, Shaanxi University of Science and Technology 9 , Xi'an 710021, People's Republic of China

Abstract

Dielectric capacitors own great potential in next-generation energy storage devices for their fast charge-discharge time, while low energy storage capacity limits their commercialization. Enormous lead-free ferroelectric ceramic capacitor systems have been reported in recent decades, and energy storage density has increased rapidly. By comparing with some ceramic systems with fashioned materials or techniques, which lacks repeatability, as reported latterly, we proposed a unique but straightforward way to boost the energy storage capacity in a modified conventional ferroelectric system. Through stoichiometric ratio regulation, the coexistence of the C-phase and T-phase was obtained in 0.85(Ba1-xCax)(ZryTi1-y)O3-0.15BiSmO3-2 wt. % MnO ceramics with x = 0.1 and y = 0.15 under the proof of the combination of Rietveld XRD refinement and transmission electron microscope measurement. The Wrec of 3.90 J/cm3, an excellent value for BCZT-based ceramic at the present stage, was obtained because of the co-contribution of the optimization of electric field distribution and the additional interfacial polarization triggered at the higher electric fields. The finite element simulation and physical deduction, which fits very well with our experimental result, were also performed. As to the practical application, stable performance in a long-time cycle and frequency stability was obtained, and excellent discharge behaviors were also achieved.

Funder

National Natural Science Foundation of China

open foundation of key laboratory of auxiliary chemistry and technology for chemical industry, ministry of education, shaanxi university if science and technology

shaanxi collaborative innovation center of industrial ausiliary chemistry and technology, shaanxi university of science and technology

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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