The low temperature Arrhenius behavior can be attributed to the prominence of Li + migration in the one-dimensional channels found in the structure of Li10SnP2S12. This explanation is in accordance with that of isostructural Li10GeP2S12 reported by Liang et al. At intermediate temperatures, the decrease of 𝜏 SAE -1 with increasing temperature may be explained by a fast exchange of the Li + ions in the tunnels. This makes all Li + sites magnetically equivalent, causing a rapid decrease of the apparent 𝜏 SAE -1 , as also explained by Liang et al. At even higher temperatures, Li + migration between the tunnels can occur, leading to quasi-3D transport. As a result, the inverse correlation time 𝜏 SAE -1 again increases with temperature. However, this transport regime is characterized by a relatively slow Li + jump rate and a higher activation energy than the tunnel transport that dominates at low temperatures.