title: Ultrafast Discharge and Enhanced Energy Density of Polymer Nanocomposites Loaded with 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O3One-Dimensional Nanofibers.
abstract: One-dimensional (1D) materials as fillers introduced into polymer matrixes have shown great potential in achieving high energy storage capacity because of their large dipole moments. In this article, 1D lead-free 0.5(Ba0.7Ca0.3)TiO3-0.5Ba(Zr0.2Ti0.8)O3nanofibers (BCZT NFs) were prepared via electrospinning, and their formation mechanism was systematically studied. Polypropylene acyl tetraethylene pentamine (PATP) grafted into the surface of BCZT NFs was embedded in the polymer matrixes, which effectively improved the distribution and compatibility of the fillers via chemical bonding and confined the movement of the charge carriers in the interface filler-matrix. The energy density at a relatively low electric field 380 MV m-1was increased to 8.23 J cm-3by small loading of fillers, far more than that of biaxially oriented polypropylene (BOPP) (≈ 1.2 J cm-3at 640 MV m-1). Moreover, the nanocomposite loaded with 2.1 vol % BCZT@PATP NFs exhibits a superior discharge speed of ≈0.189 μs, which indicates the potential application in practice. The finite element simulation of electric potential and electric current density distribution revealed that the PATP grafted into the BCZT NFs surface could significantly improve the dielectric performances. This work could provide a new design strategy for high-performance dielectric polymer nanocomposite capacitors.
authors.affiliation: School of Materials Science & Engineering, Tongji University , 4800 Caoan Road, Shanghai 201804, China.
authors.forename: Zhongbin
authors.identifier: http://orcid.org/0000-0002-7522-5840
authors.initials: Z
authors.lastname: Pan
authors.affiliation: School of Physics and Electronic Engineering, Guangzhou University , Guangzhou, 510006, China.
authors.forename: Lingmin
authors.initials: L
authors.lastname: Yao
authors.affiliation: School of Materials Science & Engineering, Tongji University , 4800 Caoan Road, Shanghai 201804, China.
authors.forename: Jiwei
authors.initials: J
authors.lastname: Zhai
authors.affiliation: School of Materials Science & Engineering, Tongji University , 4800 Caoan Road, Shanghai 201804, China.
authors.forename: Haitao
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Materials Science & Engineering, Tongji University , 4800 Caoan Road, Shanghai 201804, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Shen
keywords: capacitors; dielectric properties; energy density; lead-free; nanocomposites