Two Dimensional High k Nanosheets for Dielectric Polymer Nanocomposites with Ultrahigh Discharged Energy Density
Flexible dielectric materials with high electrical energy densities are of crucial importance in advanced electronics and electric power systems. The conventional methods for fabricating flexible dielectric materials with high electrical energy densities are introducing zero one and three dimensional high k inorganic nanofiller into a dielectric polymer matrix while less two dimensional high k nanofillers were included. Herein, two dimensional (2D) high k titanium dioxide nanosheets prepared by a one step hydrothermal reaction were utilized to boost the energy storage performance of dielectric polymer nanocomposites. It was found that compared with the polymer matrix the nanocomposites not only exhibit an enhanced dielectric constant but also show suppressed dielectric loss, which is desirable for energy storage applications. The nanocomposite with 5 wt 2D nanosheets exhibits a superhigh discharged energy density of 13.0 J/cm3 at 570 MV/m, which is nearly four times greater than that of commercializ.