Abstract
Recent research in the development of flexible polymer dielectric materials for the conversion of electrical energy is springing up. A state-of-the-art energy-storage polymer-based composite with the potential of improving the performances (energy-storage density and efficiency) at the low electric field strength is proposed here. The ferroelectric polymer P(VDF-TrFE-CFE) (PVTC) blending with linear polymethyl methacrylate (PMMA) is used as the matrix to ensure higher polarization and lower energy loss. Meanwhile, the inorganic 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BZCT) nanofibers work as the filler, and the double transition layers of core-shell structure (Al2O3+SiO2) serve as the interface. Finally, P(VDF-TrFE-CFE)-based composites with double-shell structured BZCT nanofibers of parallel and orthogonal configurations were fabricated. The effects of microstructure information (matrix, filler, interface) together with different configurations (parallel and orthogonal configurations) of BZCT@Al2O3@SiO2 nanofibers on the performances of nanocomposites were systematically and primarily discussed. Importantly, the Orthogonal BZCT@A@S⊥PVTC + PM composite with 3 vol% BZCT@A@S NFs possessed an excellent discharged energy density (~20.1 J/cm3) with charge-discharge efficiency of ~58.6% at ~440 kV/mm; meanwhile, the in-plane thermal conductivity of it reaches to ~0.33 W/(m·K). Referring to the experimental findings and simulation results, a mechanism related to rapidly polarized ferroelectric filler was proposed.
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