The predicted D cation for the rest of the IL's studied are reported in the Supplementary Information. are smaller. This trend is followed by all the IL's studied in this work and it is slightly improved after using the correction formula to take into account the finite-size effect. Underestimation of self-diffusion coefficients may be due to short production times, or because the parameters for IL's in this work resulted in stronger attractive interactions in the bulk between cations and anions, or a combination of both. In all cases, the calculated values follow a similar expected trend to the experimental diffusion coefficients, with increasing D cation as the temperature increases.