Significantly improved energy storage performance of polyetherimide based composite materials by introducing Na 0.5 Bi 0.5 TiO 3 filler surface-modified with organic molecular semiconductors

, exhibiting an improvement of 59% compared to pure PEI. It is worth noting that the energy efficiency of the composites in both cases reached more than 90%, which is very beneficial for practical applications. This work provides a feasible way to develop high quality dielectric materials at high temperature.