期刊
CHEMICAL ENGINEERING JOURNAL
卷 422, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130130
关键词
Lead-free capacitor; NaNbO3-based; Relaxor antiferroelectric; Energy storage properties
资金
- National Key R&D Program of China [2020YFA0711504]
- Natural Science Foundation of China [12004181, 52073144]
- Natural Science Foundation of Jiangsu Province [BK20200473, BK20201301]
- Major Program for Science and Technology of Inner Mongolia Autonomous Region [2019ZD12]
- Support Program for Grassland Talents Innovation Team of Inner Mongolia
- Fundamental Research Funds for the Central Universities [30919011298]
- Large Instruments Open Foundation of Nanjing University of Science Technology
Lead-free ceramic-based dielectric capacitors with Bi3+ and Mg2+ solid solutions in the NaNbO3 matrix demonstrate high breakdown strength, ultrahigh recoverable energy density, efficiency, superior frequency, cycling, thermal stability, and ultrafast discharge rate. These results suggest their potential as promising candidates for energy storage applications.
Lead-free ceramic-based dielectric capacitors have attracted extensive investigation due to their potential applications in pulsed power devices. However, the main drawback of dielectric ceramics is the relatively low energy storage density. Herein, Bi3+ and Mg2+ with different ionic radius and valence are introduced into antiferroelectric NaNbO3 matrix to form (Na1-3/2xBi3/2x)(Nb1-xMgx)O3 solid solutions, where the antiferroelectric phase is stabilized and the relaxor behavior is also improved. Of particular importance is that a large breakdown strength (Eb) of 78.3 kV/mm, an ultrahigh recoverable energy density (Wrec) of 10.9 J/cm3 and efficiency (eta) of 83% are simultaneously achieved in (Na0.91Bi0.09)(Nb0.94Mg0.06)O3 ceramic. Moreover, the energy storage properties of (Na0.91Bi0.09)(Nb0.94Mg0.06)O3 ceramic also reveals superior frequency (1-100 Hz), cycling (100-105) and thermal (30 degrees C-100 degrees C) stability, together with the ultrafast discharge rate (<25 ns). These results demonstrate the NaNbO3-based lead-free relaxor antiferroelectric ceramics is a promising candidate for energy storage application.
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