期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 54, 期 12, 页码 1160-1169出版社
WILEY
DOI: 10.1002/polb.24023
关键词
carboxylic polystyrene nanoparticles; crosslinked nanocomposites; dielectric permittivity; high-power-density capacitor; poly(vinylidene fluoride-chlorotrifluoroethylene)
资金
- National Natural Science Foundation of China [21274057, 21274061, 21303111]
- Program for Changjiang Scholars and Innovative Research Team in University
High-capacity or high-power-density capacitors are being actively investigated for portable electronics, electric vehicles, and electric power systems. The dielectric nanocomposite with a small loading of carboxylic polystyrene (PS-COOH) nanoparticles in poly(vinylidene fluoride-chlorotrifluoroethylene) [ P(VDF-CTFE)] matrix, followed by chemical crosslinking has been described. Combination of these two methods significantly improved the capacity of electric energy storage at low electric field. Specially, the nanocomposite with 2 wt % nanoparticles and 15 wt % crosslinking agent achieved a dielectric constant of 17.2 and a discharged energy density of 17.5 J/cm(3) (4.9 Wh/L) at an electric field as high as 324 MV/m, while corresponding values for pristine P(VDF-CTFE) are 9.6 and 13.3 J/cm(3) (3.7 Wh/L), respectively. Fundamental physics underlying the enhancement in the performance of the nanocomposites with respect to P(VDF-CTFE) is illustrated by solidstate F-19 nuclear magnetic resonance of direct excitation or F-19{H-1} cross polarization. It revealed different dynamics behavior between crystalline/amorphous regions, and PS-COOH nanoparticles favored the formation of polar c-form crystals. Small-angle X-ray scattering studies revealed the contribution of the interface to the extraordinary storage of electric energies in the nanocomposites. This approach provided a facile and straightforward way to design or understand PVDF-based polymers for their practical applications in high-energy-density capacitors. (C) 2016 Wiley Periodicals, Inc.
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