Preparation of 3D BN-BT/PVDF skeleton structure composites for high thermal conductivity and energy storage
Lizhu Guan, Xuemin Zhao, Zengren Ji, Mengyuan Jiang, Yongai Cui, Ling Weng, Xuan Wang, Junwang Liu
Abstract
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.