. This measurement technique assesses the Li + correlation time 𝜏 SAE as a function of temperature. The measured correlation times specify the probability of a change of the quadrupolar frequency, corresponding to a lithium jump rate proportional to 𝜏 SAE -1 . Generally, SAE probes ion dynamics on the timescale of ~10 -4 to 10 1 seconds, or jump rates in the sub-Hz to low kHz range. Consequently, multiple jump events by the same ion may occur over the course of the measurement. The activation barrier for ion transport on this timescale can be obtained from the Arrhenius relation of 𝜏 SAE -1 with temperature (Figure ).