High-temperature dielectric polymers with high breakdown strength and energy density via constructing the electron traps in blends

The n-type semiconductive polymer with perylene diimide (PTCBI) filler can immobilize electrons to reduce charge transport in the blends. In this paper, the influence of PTCBI loading on the dielectric and energy storage performances of PTCBI/PEI blends was studied. The results showed that the highest dielectric constant of 7 at 1 KHz was found in 4 wt% PTCBI/PEI blends. Importantly, PTCBI/PEI blends presented excellent temperature stability of dielectric properties from 25 degrees C to 150 degrees C. The breakdown strength of PTCBI/PEI blends improved from 359 kV/mm to 485 kV/mm when the increased content of PTCBI filler was below 1 wt%. The eta of 86% and the maximal discharge energy density (Ud) of 8.0 J/cm(3) were achieved at 540 kV/mm in 1 wt% PTCBI/PEI blends. Meanwhile, the eta of 82% and the Ud of 5.12 J/cm(3) at 500 kV/mm at 100 degrees C was obtained.

Automated summary

The study found that the highest dielectric constant was observed in the 4 wt% PTCBI/PEI blends, which also exhibited excellent temperature stability from 25 degrees C to 150 degrees C. In the 1 wt% PTCBI/PEI blends, an eta of 86% and a maximal discharge energy density of 8.0 J/cm(3) were achieved.