Preparation and properties comparison of ZIF-67/PVDF and SiCNWs/PVDF composites for energy storage

With the rapid development of electronic industry, dielectric capacitors are widely used. Polyvinylidene fluoride (PVDF)-based composites have become facilitated dielectric energy storage materials. Improving the performance of PVDF-based composites is hotspot in recent years. In this paper, ZIF-67, a typical metal-organic frameworks (MOFs) material, was selected as the nano fillers to prepare ZIF-67/PVDF nanocomposites, and SiCNWs/PVDF nanocomposites containing silicon carbide nanowires (SiCNWs) with high dielectric constant were controllable prepared as the control. The effects of different types of fillers on the mechanical properties, dielectric properties and energy storage properties of PVDF-based composites were investigated, and the performance between ZIF-67/PVDF and SiCNWs/PVDF was compared. ZIF-67 and SiCNWs affect the crystallization process of PVDF matrix and promote the transformation from alpha-phase to beta-phase, which contributes to improve the mechanical properties and dielectric properties of PVDF-based composites. At the same time, ZIF-67 can improve the breakdown field strength of the ZIF-67/PVDF composites. Finally, 5 wt% ZIF-67/PVDF nanocomposites delivered 0.97 J/cm(3) energy storage density (at 130 kV/mm), which was increased by 97.96% compared with the pure PVDF.

Automated summary

With the rapid development of electronic industry, dielectric capacitors are widely used. Polyvinylidene fluoride (PVDF)-based composites have become facilitated dielectric energy storage materials. In this study, ZIF-67 and SiCNWs were used as fillers to enhance the mechanical, dielectric, and energy storage properties of PVDF-based composites. ZIF-67/PVDF nanocomposites showed improved performance compared to SiCNWs/PVDF, with increased energy storage density of 97.96%.