Energy storage performance of topological functional gradient composite dielectric

The excellent properties of natural biomaterials can provide useful inspiration for the optimal design of artificial materials. Inspired by the distribution of vascular bundles in the cross-section of bamboo, this work designs a series of topological functional gradient composite dielectric with insulating fillers or polarized fillers, and analyzes the breakdown path evolution by stochastic breakdown simulation. Experimental results demonstrate that the topological functional gradient can regulate the breakdown strength and polarization strength of the composite dielectric, and then obtain an enhanced energy storage density. However, the effect of structural regulation on the improvement of polymer performance varies depending on the material combination, and in this experiment, structural regulation can play the most positive role when the selected filler has similar dielectric properties to the matrix. This work supplies a useful reference for the construction of functional gradient structures and material system combinations.