In this work, homogeneous ceramics-polymer nanocomposites consisting of surface treated BaTiO₃ (BT) particles as fillers and poly(vinylidene fluoride) polymer as matrix have been prepared using a solution casting process. The nanocomposites exhibit enhanced dielectric permittivity and reduced loss tangent. The frequency and temperature dependencies of the dielectric permittivity and loss tangent of the nanocomposites suggest that the introduced BT phase and interface areas contribute to the improvement of the dielectric responses. Meanwhile, the X-ray diffraction patterns and Differential Scanning Calorimetry (DSC) curves indicate that the incorporation of ceramic particles contributes to the decrease of the crystallite size, the increase of the crystallinity, and the shift of the crystallization temperature of the polymer matrix. Furthermore, the dielectric displacement and energy density of the nanocomposites are significantly enhanced and an energy density of 3.54 J/cm³ was obtained under an electric field of 200 MV/m with the BT concentration of 20 vol. %. The results indicate that the introduced ceramic fillers and interface areas have positive influences on the structure of the polymer matrix and contribute to the enhancement of the dielectric responses and energy storage properties of the nanocomposites.

Homogeneous ceramics-polymer nanocomposites comprising core-shell structured BaTiO₃/SiO₂ nanoparticles and a poly(vinylidene fluoride) polymer matrix have been prepared. The nanocomposite of 2 vol. % BaTiO₃/SiO₂ nanoparticles exhibits 46% reduced energy loss compared to that of BaTiO₃ nanoparticles, and an energy density of 6.28 J/cm³, under an applied electric field of 340 MV/m. Coating SiO₂ layers on the surface of BaTiO₃ nanoparticles significantly reduces the energy loss of the nanocomposites under high applied electric field via reducing the Maxwell–Wagner–Sillars interfacial polarization and space charge polarization.