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Polymer nanocomposite dielectrics with high electrical energy density are critical for a number of modern electronic and electrical power systems,such as such as hybrid electric vehicles(HEV),medical defibrillators,and power regulations in smart grid.The energy density of a dielectrics is Ue=∫EdD,which indicates that the electric displacement(D)and the breakdown strength have to be enhanced simultaneously in order to realize high energy density.