Figure shows the structure of the center-of-mass RDF for [TFSI] -[TFSI] interactions. Anionanion center-of-mass RDFs exhibit a split but clearly visible broad peak at around 2.9 Å. We can see that the [TFSI] -anions show very clear and visible structure. Similar to the phenomenon observed for [EMI] + ring centers, The intensity (height) of the peak for the [TFSI] -anions center-of-mass increase in the order C 1 > D 1 > E 1 > F 1 > G 1 , indicating that the ordering between the center-of-mass anions is enhanced by the addition of EC/DMC carbonate in the mixture.