Preparation of 3D BN-BT/PVDF skeleton structure composites for high thermal conductivity and energy storage

To obtain high energy storage dielectric materials with high thermal conductivity for electronic devices, we designed and constructed three-dimensional (3D) BN-BT/PVDF skeleton structure composites based on the ice template method and freeze-drying technology. Phonon thermal conductivity and intrinsic thermal conductivity can be improved by the hexagonal boron nitride (h-BN) thermal conductive skeleton orientation along the ice crystal on nanoscale. The 3D BN-BT/PVDF skeleton structure composites with high thermal conductivity and high energy storage can be obtained by impregnating the barium titanate (BT) modified polyvinylidene fluoride (PVDF) precursor into a 3D thermal conductive skeleton. When the h-BN content is 25 wt%, the comprehensive performance of BN-BT/PVDF composite are the most excellent with the energy storage density of 2.6355 J/cm3, which is 5.64 times of pure PVDF, and the thermal conductivity can reach 0.302 W/(m·K), an improvement of 152%, showing a promising industrial application prospects.