614 / 2022-03-30 19:23:20

Study on High-Temperature Energy Storage Performance of  Blended PEI/PI  All-Organic Composite Dielectrics

polyimide,polyetherimide,high temperature energy storage,breakdown strength

Purpose/Aim

The development of high-temperature energy storage dielectrics is critical to the next generation of power electronics for pulsed power systems. Improving the high-temperature breakdown strength is one of the important ways to increase the high-temperature energy storage density. This work utilizes the corona resistance property of polyimide (PI) to improve the energy storage property of polyetherimide (PEI) and obtain the mechanism to enhance the high temperature breakdown, which provides new ideas for designing high temperature resistant energy storage dielectric.

Experimental/Modeling methods

In this paper, the co-blended polymer films with different PI contents were prepared by solution flow casting method. After complete drying in a vacuum oven, the film surface is vaporized with a 3mm diameter aluminum electrical grade and tested in an oil bath for high temperature energy storage performance.

Results/discussion

The results show that PI has a significant enhancement effect on the high temperature breakdown of PEI. In addition to the corona resistance of PI itself, it is also related to the interface formed between PI and PEI. In addition, the composite dielectric high-temperature energy storage density has been improved. The microcrystalline structure and functional group structure of the blend films were characterized by XRD and FTIR, and the effect of PI mixing on the microstructure of PEI was observed.

Conclusions

Incorporating PI into PEI proved to be an effective method to enhance the high-temperature energy storage properties of composite dielectrics. This provides a new idea for the design of high-temperature energy storage composite dielectric.