期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 39, 页码 43942-43949出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c13057
关键词
energy storage; capacitors; lead-free; BaTiO3; dielectric; ceramics
资金
- Engineering and Physical Sciences Research Council [EP/L017563/1, EP/N010493/1]
- Henry Royce Institute for Advanced Materials
- EPSRC [EP/R00661X/1, EP/S019367/1, EP/P02470X/1, EP/P025285/1]
- National Natural Science Foundation of China [51602060, 51402005]
- Functional Materials and Devices group from The University of Sheffield
- EPSRC [EP/L017563/1, EP/S019367/1, EP/N010493/1, EP/P02470X/1, EP/P015859/1] Funding Source: UKRI
Ceramic dielectrics are reported with superior energy storage performance for applications, such as power electronics in electrical vehicles. A recoverable energy density (W-rec) of similar to 4.55 J cm(-3) with eta similar to 90% is achieved in lead-free relaxor BaTiO3-0.06B(i2/3)(Mg1/3Nb2/3)O-3 ceramics at similar to 520 kV cm(-1). These ceramics may be co-fired with Ag/Pd, which constitutes a major step forward toward their potential use in the fabrication of commercial multilayer ceramic capacitors. Compared to stoichiometric Bi(Mg2/3Nb1/3)O-3-doped BaTiO3 (BT), A-site deficient Bi-2/3(Mg1/3Nb2/3)O-3 reduces the electrical heterogeneity of BT. Bulk conductivity differs from the grain boundary only by 1 order of magnitude which, coupled with a smaller volume fraction of conducting cores due to enhanced diffusion of the dopant via A-site vacancies in the A-site sublattice, results in higher breakdown strength under an electric field. This strategy can be employed to develop new dielectrics with improved energy storage performance.
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