Specifically, a significant reduction of D is seen near the surface when smaller (vs larger) tethered anions are present (Figure ), an effect attributable to the stronger ion-pair electrostatic interactions at play in the former case. The parameters considered for the above results clarify mechanistic underpinnings for the conductivity behavior in nanoparticle-based single-ion conducting electrolytes and help to explain the experimental results reported by Schaefer et al. However, there has also been significant recent interest in developing single-ion conducting batteries based on alkali metals other than Li such as Na, K, etc. These works have further inspired other studies which have suggested the size of the mobile charged carrier to be a critical parameter influencing the conductivity. Motivated by such developments, we used our multiscale strategy to predict the influence of mobile cation size on conductivity. To model a range of cation sizes while mimicking the size disparity between Na + , K + , and Li + ions, we considered four additional cation sizes σ cat = 0.25 σ, 0.75 σ, 0.85 σ, and 1.0 σ, while the anion size was fixed to be σ anion = 2.0 σ.