期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 8, 期 7, 页码 2258-2264出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc06218a
关键词
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资金
- National Natural Science Foundation of China [51572159]
- Shaanxi Science & Technology Co-ordination & Innovation Project of China [2017TSCXL-GY-08-05]
- Science Fund for Distinguished Young Scholars of Shaanxi Province [2018JC-029]
The design of ceramic dielectrics with high energy-storage properties and outstanding temperature stability is an important but challenging topic in advanced electronic and electrical power systems. Here, we utilized a strategy to achieve synergistic enhancement of energy density and energy efficiency in the (1 - x)(Na0.5Bi0.5)(0.7)Sr0.3TiO3-xBi(Mg2/3Nb1/3)O-3 systems based on refined grain size and the introduction of Bi3+'s lone pair electron 6s(2) configuration, respectively. As a result, a giant discharge energy density of 3.45 J cm (3) and a high energy efficiency of 88.01% were simultaneously achieved in the 0.85NBST-0.15BMN ceramic, which precede those of recently reported lead-free dielectric ceramic materials. Meanwhile, excellent temperature (30-150 degrees C) and frequency (1-100 Hz) stability were also observed at 200 kV cm(-1). Moreover, an outstanding power density (P-D) of 38.47 MW cm(-3) and an ultrafast discharge rate (t(0.9)) of 52.8 ns were also achieved in the 0.85NBST-0.15BMN ceramic at 120 kV cm(-1). These results may provide a feasible approach to develop more NBST-based lead-free ceramics with vastly improved energy-storage properties.
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