Nanonet-/fiber-structured flexible ceramic membrane enabling dielectric energy storage

Ceramics are considered intrinsically brittle at macro scale due to the lack of slip mechanism and pre-existing defects, which greatly limits their potential applications in emerging fields including wearable electronic devices flexible display. In this contribution, we developed BiFeO3/SiO2 dual-networks with exceptional flexibility through a coupled electronetting/electrospun method. The hybrid nanostructured networks endow material high tensile strength (2.7 MPa), excellent (80% recoverable deformation), robust fatigue resistance performance (maintain after 1000-cyclic compress test). After in-situ compounded dielectric polymer via layer-by-layer solution casting method, resultant three-dimensional (3D) composite film exhibits twice higher constant (εr) than polyether imide (PEI) film. More importantly, breakdown 3D is almost same as that PEI film, resulting an enhanced energy density ~6.0 J/cm3 efficiency 80% 4.58 MV/cm. unique structure, combined balance between mechanical properties structures, critical significance design functional ceramics broadening electric devices.