High-Energy-Density Ferroelectric Polymer Nanocomposites for Capacitive Energy Storage: Enhanced Breakdown Strength and Improved Discharge Efficiency

Emerging dielectric composites consisting of polymer and ceramic nano-inclusions or several polymers facilitate the development of capacitive energy storage materials, as they can preserve high breakdown strength and exhibit enhanced dielectric constant. Ferroelectric poly(vinylidene fluoride) (PVDF) and its copolymers have been intensively studied as the matrices because of their high intrinsic dielectric constant and breakdown strength. Here, we review the recent advances on improving the energy density of PVDF-based composite dielectrics. It is concluded that, promotion of energy density is mainly established on enhanced breakdown strength and improved discharge efficiency. The microstructure design, material performance, and mechanism associated with these parameters are described. Perspectives for future development on PVDF-based nanocomposites and application of other potential polymer matrices are presented at last.