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 ( U d ) 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 U d 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 U d of 4.86 J cm −3 is obtained at 150 °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 . • The core-shell BaTiO 3 nanoparticles is prepared via using polymer semi-conductive modifier. • The enhancement mechanism of energy storage performance is studied. • The discharge energy density of PEI-based nanocomposites at 150 °C is 4.86 J cm −3 .