Beyond suggesting further work on grain-boundary simulations, we demonstrate the potential to access motion even in single pristine crystalline Li-ions, by deriving hACF C Q i and calculating a corresponding ⌧ , which does exhibit a decay at 300 K for -LPS. Furthermore, we show that the Li hopping rate predicted by ⌧ 1 from hACF C Q i is comparable with that calculated from the -LPS MSD.