Abstract
In this study, a new type of plate-like boron nitride (BN) and barium titanate (BT) composite nanofiber (BN@BT) was fabricated by an electrospinning technology, and introduced into polyimide (PI) matrix to form nano-composite films by in-situ polymerization method. The composite film with 20 wt% BN@BT-fiber shows a high dielectric constant of εr = 47.57 and a low dielectric loss of tgδ = 0.0334 at room temperature. When the content of BN@BT-fiber is up to 1 wt%, the composite film exhibits a maximum energy storage density of Ue = 7.1 J/cm3 at 3438 kV/cm, which is about three times greater than that of PI (≈2.4 J/cm3 at 3628 kV/cm). Meanwhile, the plate-like boron nitride (BN) also enables the composite film to have an improved heat dissipation and thermal stability, and then improves the breakdown field strength.
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