High Energy Storage of PLZT/PVDF Nanocomposites with a Trilayered Structure

Designing a multilayer structure is an efficient strategy to synthesize dielectric nanocomposite films with excellent dielectric properties and energy density. In this study, lead lanthanum zirconate titanate (PLZT)/poly(vinylidene fluoride) (PVDF) films with good dielectric properties and boron nitride nanosheet (BNNS)/PVDF films with high breakdown strength were prepared using the casting method. Then, a trilayer-structured film with a PLZT/PVDF layer sandwiched between two BNNS/PVDF layers was fabricated using the hot-pressing method. The effect of PLZT fillers with different dimensions on the electrical properties of the trilayer nanocomposites has been investigated. The results show that (BNNS/PVDF)–(PLZT/PVDF)–(BNNS/PVDF) nanocomposite films containing PLZT nanowires have excellent dielectric properties and energy density, with a dielectric constant of 10.34, a breakdown strength of 429.03 MV/m, and the maximum energy storage density nearly 5 J/cm 3, far more than those of the biaxially oriented polypropylenes.