Professor Wang Hong’s research team at School of Electronic and Information Engineering designed and created ceramic/polymer energy storage dielectric materials with sandwich structures. Through adjusting the volume fraction of organic fillings, the researchers enhanced the middle layer in pressure resistance. Meanwhile, the layers on the two ends are strengthened in polarization. Also through differentiated dielectric layers, the internal electric field distribution was adjusted to effectively decrease the electric field pressure at the two ends and subsequently limit the dielectric piercing to a certain part instead of the whole compound materials. And the research simulation validated the different layers of dielectric materials with the sandwich structures could resist the electrical trees and demonstrated interface effect contributed to improving the materials’ piercing and energy storage performances.

The research produced new dielectric materials, with piercing field as high as 470MV/m. the energy storage density is 18.8J/cm3. The energy storage performance is three times higher than that of the substrate. The findings were published in the internationally prestigious materials science journal Advanced Materials (the impact factor was 17.493).

The first author is the PhD student Wang Yifei of the School of Electronic and Information Engineering. The simulation work was done by another PhD student of the School, Cui Jin. XJTU is the first authoring unit of the paper.

For original paper, read through the linkhttp://dx.doi.org/10.1002/adma.201503186