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Nano energy v.31, 2017년, pp.49 - 56   SCIE
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Significantly enhanced energy storage performance promoted by ultimate sized ferroelectric BaTiO3 fillers in nanocomposite films

Hao, Yanan (State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China ); Wang, Xiaohui (State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China ); Bi, Ke (State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China ); Zhang, Jiameng (State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China ); Huang, Yunhui (State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China ); Wu, Longwen (State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China ); Zhao, Peiyao (State Ke ); Xu, Kun ( ); Lei, Ming ( ); Li, Longtu ( );
  • 초록  

    Abstract 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, 6.9nm BaTiO 3 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 (≥330kV/mm) are observed in the nanocomposite films containing 10–40 vol.% BaTiO 3 nanofillers. In consequence, a maximal discharged energy density of 9.7J/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. Highlights For the first time, ultimate sized BaTiO 3 nanocrystals (~6.9nm) serve as fillers of nanocomposite films for energy-storage applications. Significantly high breakdown strengths ( E b ≥330kV/mm between 10–40vol%, E b = 133kV/mm at 80vol%) and enhanced energy density (maximal U dis =9. 9.7J/cm 3 ) are obtained. Graphical abstract PVDF/BT nanocomposite films composed of ultimate sized ferroelectric BaTiO 3 nanocrystals are fabricated by spin-coating of the highly dispersed nanocomposite sol. Remarkable energy storage performance and significant high breakdown strength are obtained in the dense and uniform nanocomposite films containing 10–40 vol.% BT. [DISPLAY OMISSION]


  • 주제어

    Dielectric nanocomposite .   Barium titanate .   Permittivity .   Dielectric strength .   Energy storage.  

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