Energy storage plays a key role in distinct fields such as smart grid systems, portable electronics, space technology, telecommunication industry and so on. However, in order to meet the rising requirements of next-generation technologies and ensure sustainable development, the limitations of energy storage devices such as—low lifespan, insufficient efficiency and limited energy density—must be overcome. For this purpose, BT/PVDF nanocomposites are considered very suitable and promising materials, with high dielectric constant and electrical breakdown strength and reduced loss tangent leading to advanced energy storage potential. BT/PVDF nanocomposites can be synthesized with various methods such as solvent-casting, electrospinning, and spin coating. The structural, morphological, and functional properties of BT/PVDF nanocomposites are defined with XRD, SEM, and FTIR techniques.

It has been demonstrated that various factors influence the dielectric properties of BT/PVDF nanocomposites, thereby increasing energy density. Previous studies have been reported that the consolidation of BT nanoparticles into polymer matrix can significantly enhance the dielectric permittivity and power density of the nanocomposite because of increased interface areas. On the other hand, it has been shown that the thermal treatment advances the dielectric and energy storage properties of BT/PVDF nanocomposite by enhancing compatibility of BT and PVDF. At the same time, thermal treatment results in the limitations of movements of the molecular chains of PVDF and BT nanoparticles, which further increase the energy storage performances. Thus, BT/PVDF nanocomposites with substantial dielectric properties and energy density, high power density, and good processing performance have promising potential in energy storage applications as capacitors and electronic devices.