Enhanced dielectric tunability and energy storage properties of plate-like Ba0.6Sr0.4TiO3/poly(vinylidene fluoride) composites through texture arrangement

Publication date: 12 April 2018 Source:Composites Science and Technology, Volume 158 Author(s): Li Wang, Feng Gao, Jie Xu, Kena Zhang, Jie Kong, Mike Reece, Haixue Yan Plate-like (Ba0.6Sr0.4)TiO3 (P-BST) particles were synthesized via topochemical microcrystal conversion using a two-step molten salt method. In addition, P-BST/poly(vinylidene fluoride) (PVDF) textured composites were fabricated using a tape casting and hot pressing method. The influence of the P-BST particle size on the microstructure, dielectric tunability, and energy storage properties of the P-BST/PVDF textured composites was investigated. The results revealed that P-BST/PVDF textured composites can be obtained with preferred orientation of plate-like particles, which exhibit uniform directionality in the PVDF matrix. The dielectric properties of these composites increased with increasing P-BST particle size. A new criterion EP 80 was proposed for evaluating the dielectric tunability of composites. The optimal properties of the P-BST/PVDF textured composite (minimum threshold electric field: 14 kV/mm, minimum EP 80: 29 kV/mm, and maximum energy storage density: 6.36 J/cm3) were realized at a P-BST particle size of 11.47 μm. A dielectric tunability model for inorganic/organic composites with respect to the shape factor (n) of the inorganic fillers was proposed and used to simulate the dielectric tunability of the textured composites. For the P-BST/PVDF composite, n of 4–5 in the model cor...
Source: Composites Science and Technology - Category: Science Source Type: research