A novel poly(vinylidene fluoride)/exfoliated graphite nanoplate (PVDF/xGnP) nanocomposite was successfully fabricated by a solution-cast and hot-press method. It was found that the homogenous dispersion of xGnP in the PVDF matrix could significantly improve the dielectric constant of PVDF/xGnP nanocomposite with extremely low percolation threshold. The high dielectric constant of more than 200 and 2700 could be obtained in the PVDF/xGnP nanocomposite near the percolation threshold (1.01 vol%) at 1000 Hz and 100Hz, respectively, which is 20 and 270  times more than that of PVDF matrix. When above the percolation threshold, the dielectric constant kept on increasing and the maximum value was as high as 4.5×10⁷ with a high dielectric loss of 229 at 1000 Hz (2.34 vol%).The giant increment of dielectric permittivity can be explained by the combination of the micro-capacitance structure model and MWS effect. These flexible PVDF/xGnP nanocomposites with such high dielectric performance make them potential materials for practical applications in high charge-storage capacitors and electromagnetic­wave absorption.

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