Significantly improved energy storage performance of polyetherimide-based dielectric composites via employing core-shell organic-semiconductor@BaTiO3 nanoparticles

With fast development of modern industries and electrical systems, polymer dielectrics are urgently demanded to have high discharged energy density (Ud) in elevated temperature. In this paper, novel core-shell poly [2((3,6,7,10,11-pentakis (hexyloxy) triphenylene-2-yl) oxy) ethyl methacrylate] (PHT) coated barium titanate nanoparticles (BT) (denoted as PHT@BT) are prepared, and then incorporate into polyetherimide (PEI) matrix via solution blending method. Semi-conductive organic shell layer can not only promote the dispersion and compatibility of BT nanoparticles but also construct deep trap. As a result, 0.3 wt% PHT@BT/PEI composites achieve maximal Ud of 7.62 J cm-3 at 641 MV m -1 and room temperature, which is 1.93 times that of pure PEI film (3.93 J cm-3 at 461 MV m-1 ). Importantly, the Ud of 4.86 J cm-3 is obtained at 150 degrees C. This work provides superior interfacial modifier for inorganic nanofiller, which is of great significance for the fabrication of polymer- based nanocomposites with superior U d .