Polymer-based film storage capacitors have high functional density and ultra-fast charge-discharge response time and are irreplaceable core energy storage devices for pulsed power technology, electromagnetic guns and lasers, and other high-energy weapon systems, as well as renewable energy sources. Transformation and storage, hybrid vehicles and other fields have also been widely used. However, the polymer itself has low dielectric constant and low polarization, which limits its ability to store electrical energy. At present, scientists use high dielectric constant inorganic fillers in high breakdown field strength polymers to prepare composite dielectric materials with high energy density, but the introduction of high volume fraction ceramic particles will increase the Loss of energy, reduced breakdown field strength and service life. Therefore, how to ensure that the breakdown field strength can be further improved while increasing the dielectric constant is one of the difficulties in obtaining high dielectric energy density dielectric materials.
At present, Ruan Jiwei's research group of the School of Materials Science and Engineering regulates the morphology of inorganic fillers and the interface between inorganic fillers and polymers. Progress has been made in composite dielectric materials with high energy density. The localized electric field strength of the polymer composite dielectric material is improved by the morphology of the inorganic filler (ACS Appl. Mater. Interfaces 9, 4024 (2017); ACS Sustain. Chem. Eng. 5, 4707 (2017)); using interface control Improve the polarization strength and breakdown field strength of composites (ACS Appl. Mater. Interfaces 9, 14337 (2017); J. Mater. Chem. A 4, 13259 (2016); J. Mater. Chem. A 5, 15217 (2017)). The research group is studying doctoral student Pan Zhongbin as the first author of the above paper.
In order to achieve high energy density at low voltages, the research group also made a phased progress in the ordering of inorganic fillers (ACS Appl. Mater. Interfaces 8, 26343 (2016); Nanoscale, 9, 4255 (2017). )), Yao-Min Wei, a doctoral student jointly trained by Prof. Ji Weiwei and Professor Cheng Haidong of the University of Macau, was the first author of these two papers.
Recently, the research group used the “Topochemical†method to prepare a 2D NaNbO3 template as an inorganic filler to introduce a polymer matrix, and designed and prepared a sandwich structure polymer composite high energy storage density. Dielectric material. In the sandwich structure, the upper and lower layers are polarized layers and the middle layer is a pressure-bearing layer; the intermediate layer has higher pressure resistance by adjusting the volume fractions of the upper and lower two layers of inorganic filler, and at the same time, the two layers have larger poles Intensity to achieve a high energy density. Simulation simulations verify the influence of the interface density between the 2D NaNbO3 template and sandwich structure on the leakage current density and the local electric field strength of the composite material on the polarization and breakdown field strength of the composite material, revealing the interface effect on the breakdown of the material. Field strength and the role of energy density increase. The research was published in the journal Nano Energy (https://doi.org/10.1016/j.nanoen.2017.09.004). The first author of this paper is Pan Zhongbin, Ph.D. student of this research group.
This research work was funded by the National 973 Project “Key Issues of High Energy Storage Density Inorganic Dielectric Materials (2015CB654600)â€.
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