In addition to changes in Nernst-Einstein transport, the role of non-ideal contributions to transport arising from ion-ion correlations also changes as a function of the degree of electrolyte confinement. The collective impact of these non-ideal contributions to transport can be quantified via the ionicity (also known as the inverse Haven ratio), which is defined as the ratio of the total conductivity and the Nernst-Einstein conductivity, i.e., κ/(e 2 L ++ self +e 2 L -- self ). An electrolyte obeying ideal solution or Nernst Einstein transport would have an ionicity value of one. As shown in Fig. , the bulk electrolyte exhibits an ionicity of 0.71, while the ionicity decreases in confined systems down to a value of 0.46 for the bilayer electrolyte. This change reflects the trends in the non-ideal transport coefficients shown in the right panel of Our results suggest that such assumptions would give rise to significant error, in this case a 52% overestimation of the conductivity in the monolayer electrolyte.