Enhanced dielectric properties of polyvinylidene fluoride-based composite films with layered perovskite KCa.sub.2Na.sub.3Nb.sub.6O.sub.19-derived fillers

A polyvinylidene fluoride (PVDF)-based composite film embedded with plate-like fillers was investigated as a novel dielectric composite material that can serve as a candidate film capacitor. Plate-like particles of the dielectric Ca.sub.2Na.sub.3Nb.sub.6O.sub.19 (CNN6) filler material were prepared...

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Bibliographic Details
Published inJournal of materials science Vol. 55; no. 34; pp. 16247 - 16254
Main Authors Inagaki, Yumi, Kozawa, Takahiro, Yano, Kazuhisa, Nakamura, Tadashi
Format Journal Article
LanguageEnglish
Published Springer 01.12.2020
Subjects
Analysis
Capacitors
Dielectrics
Electrical conductivity
Fluorine compounds
Founding
Perovskite
Polyvinylidene fluoride
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Summary:A polyvinylidene fluoride (PVDF)-based composite film embedded with plate-like fillers was investigated as a novel dielectric composite material that can serve as a candidate film capacitor. Plate-like particles of the dielectric Ca.sub.2Na.sub.3Nb.sub.6O.sub.19 (CNN6) filler material were prepared through liquid-phase exfoliation of KCa.sub.2Na.sub.3Nb.sub.6O.sub.19 synthesized by a conventional solid-state reaction method. CNN6 fillers with an average aspect ratio of 2.0 were successfully dispersed in a PVDF matrix without large aggregation using a solution blending and casting method. The resultant CNN6/PVDF composite film exhibited higher breakdown strength than a dielectric PVDF-based composite embedded with spherical BaTiO.sub.3 fillers. The superiority of the plate-like filler particles over spherical filler particles was qualitatively confirmed by finite element simulation using a simplified filler/matrix model. A CNN6/PVDF composite film with a thickness of 3.8 [micro]m exhibited a high capacitance density of 10.1 F m.sup.-3, which was three times higher than that of a biaxially oriented polypropylene film currently used for film capacitors in the power control units of hybrid vehicles.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-020-05169-2