期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202000191
关键词
all-inorganic nanocomposites; bioinspired hierarchical structures; breakdown strength; energy storage; polarization
Lead-free dielectric ceramics have been the spotlight in the search for environmentally benign materials for electrostatic energy storage because of the ever-increasing environmental concerns. However, the inverse correlation between the polarization and dielectric breakdown strength is the major barrier hindering the provision of sufficient energy densities in lead-free dielectric ceramics and practical applications thereof. Herein, a rational structure design inspired by nature is demonstrated as an effective strategy to overcome these challenges. Bioinspired raspberry-like hierarchically structured all-inorganic nanocomposites have been prepared by enclosing microsized BaTiO3-Bi(Mg0.5Zr0.5)O-3 (BT-BMZ) relaxor ferroelectrics using core-shell BT-BMZ@SiO2 nanoparticles. The synergistic effects of the bioinspired hierarchical structure and insulating SiO2 nano-coating result in significantly improved dielectric breakdown strength and sustained large polarization in the nanocomposites, as corroborated by experimental characterizations and theoretical simulations. As a result, an ultrahigh energy density of 3.41 J cm(-3) and a high efficiency of 85.1%, together with outstanding thermal stability within a broad temperature range, have been simultaneously achieved in the hierarchically structured nanocomposites. This contribution provides a feasible and paradigmatic approach to develop high-performance dielectrics for electrostatic energy storage applications using bioinspired structure design.
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