A multiple-quantum nuclear magnetic resonance study of interstitial Li clusters in LixC60

We characterize the local Li structure in the low-temperature phase of LixC60 with 6⩽x⩽15 using single and multiple-quantum Li7 nuclear magnetic resonance spectroscopy. We find clear evidence for Li cluster intercalated structures in all compositions. The inferred cluster sizes are significantly smaller than those suggested by the stoichiometry and could be explained by a more disordered LixC60 low-temperature phase than expected from the current models.