Improved energy storage performance of sandwich-structured P(VDF-HFP)-based nanocomposites by the addition of inorganic nanoparticles

The sandwich-structured KNN-BZT/P(VDF-HFP) nanocomposites were prepared by solution casting method. When the breakdown strength reached 565 MV m −1 , the excellent energy storage performance ( U d = 21.39 J cm −3 , η = 70.54%) was obtained.