Enhancement of Dielectric Properties and Energy Storage Density in PVDF-Based and Graphene-Nanoplatelets

The heterostructure of composite films filled with conductive fillers can improve the interfacial polarization, which is one of the keywords to enhance the dielectric and ferroelectric properties. In this study, a composite films were created by combining Polyvinylidenefluoride-trifluoroethylenechlorotrifluoroethylene. (PVDF-TrFE-CTFE), Graphene-nanoplatelets (GPN) and Polyvinylidenefluoride-hexafluoropropylene (PVDF-HFP), using the tape casting solution method. The heterostructure of the composite film improved the interfacial polarization, resulting in increased dielectric constant with terpolymer loading and GPN addition. The filled GPN1% film showed a dielectric constant of 21.5 and 13.6 at 100/0 and 70/30, respectively, compared to 17.9 and 11.8 for the 2-phase composite films. Additionally, the terpolymer and GPN loading induced the maximum polarization (Pmax) and changed the PE-loop (hysteresis loop) behavior. The high performance of the PVDF-TrFE-CTFE and GPN composite films in terms of their dielectric constant, dielectric loss, AC conductivity, and polarization performances make them promising materials for electric-capacitor and energy storage applications.