期刊
NANO ENERGY
卷 31, 期 -, 页码 49-56出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2016.11.008
关键词
Dielectric nanocomposite; Barium titanate; Permittivity; Dielectric strength; Energy storage
类别
资金
- Ministry of Sciences and Technology of China through National Basic Research Program of China (973 Program) [2015CB654604]
- National Natural Science Foundation of China for Creative Research Groups [51221291]
- Ministry of Science and Technology of China [2016YFA0301300]
- National Natural Science Foundation of China [51272123, 51402163, 61574020]
- CBMI Construction Co., Ltd.
Polymer nanocomposite that consists of dispersed particle fillers and a flexible polymer matrix shows comprehensive excellent dielectric properties and thus is considered as promising dielectric layers in high-performance energy-storage capacitors. However, the commonly employed high permittivity particle fillers cause inevitable dielectric strength deterioration and seriously impede the energy density and reliability of the nanocomposite. To solve this problem, ultimate sized ferroelectric nanofillers, 6.9 nm BaTiO3 nanocrystals, are introduced into a poly(vinylidene fluoride-co-hexafluoro propylene) (PVDF-HFP) polymer matrix to realize both the high dielectric constant and enhanced breakdown strength. The influence of nanoparticle fraction on the microstructure and dielectric properties of the composite films is investigated. Compared to the polymer ceramic composites with coarse particle fillers, significantly enhanced breakdown strengths (>= 330 kV/mm) are observed in the nanocomposite films containing 10-40 vol.% BaTiO3 nanofillers. In consequence, a maximal discharged energy density of 9.7 J/cm(3) is obtained, which confirms that these ultimate sized nanocrystals can perform as superior high permittivity fillers in the nanocomposites for energy storage applications.
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