N.R. Pradhan
Jackson State University,
United States
Keywords: dielectric capacitors, 2D nanofillers, high energy density, high breakdown strength
Summary:
Developing a thin polymer based dielectric film with ultra-high energy density is one of the emerging fields of interest to create next generation high power density energy-storage device. Here, we will present remarkably enhanced dielectric constant and energy density of a polymer nanocomposite film based on PVDF, PMMA polymers with incorporated an exfoliated layered 2D dielectric materials Mica or h-BN as fillers in a stratified heterostructure stacking geometry. The dielectric constant of this 2D filler incorporated polymer heterostructures shows >100% enhancement over the pristine polymer (PVDF), achieved using an ultra-low loading (~1 vol%) of 2D Mica nanofillers. A dramatic enhancement of breakdown voltage is also measured in these 2D-Mica or h-BN interfaced stratified heterostructure assembly (1021-1200 MV/m) compared to the pristine polymer heterostructure film (558-700 MV/m). We observed an energy density as high as 75 J/cm3 from the 2D-Mica interfaced polymer heterostructure construct, which is the highest among the observed energy density of the polymer-nanocomposite based dielectrics. Our computational study using density function theory supports our experimental finding. A detail multi-layers 2D fillers stacked thin film capacitors will be presented for developing high energy density energy storage applications for flexible electronics.