Lithium ions diffuse within the pink-grey region of the ordered fulleride polymer Li₄C₆₀, allowing high ionic conductivity at room temperature. See article 145901 and the Physical Review Focus story.

From the article:

Superionic Conductivity in the ${\mathrm{Li}}_4{\mathbf{C}}_{60}$ Fulleride Polymer
M. Riccò, M. Belli, M. Mazzani, D. Pontiroli, D. Quintavalle, A. Jánossy, and G. Csányi
Phys. Rev. Lett. 102, 145901 (2009)

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