Fig. 4: Capacitive energy storage and electric performance of PC/BMI PNDs.

a Field-dependent energy density and discharge efficiency. b Weibull breakdown strength (Eb) of pristine PC and the PC/BMI PND with composition of PC/BMI 80/20 at 150 °C. c Electric field-dependent conduction current density, and (d) TSDC spectra of pristine PC and the PC/BMI PND with composition of PC/BMI 80/20 measured at different temperatures.