Phys. Rev. Lett. 102, 145901 (2009) [4 pages]Superionic Conductivity in the Li4C60 Fulleride Polymer
See accompanying Physics Focus We report on the extraordinary superionic conductivity in the fulleride polymer Li4C60, a crystalline material with no disorder. 7Li, NMR, and dc frequency dependent conductivity show uncorrelated ionic hopping across small energy barriers (ΔEa∼200 meV) and an ionic conductivity of 10-2 S/cm at room temperature, higher than in “standard” ionic conductors. Ab initio calculations of the molecular structure find intrinsic unoccupied interstitial sites that can be filled by Li+ cations in stoichiometric Li4C60 even at low temperatures. The low energy required for the occupation of these sites allows a sizable Li+ diffusion above 130 K. The results suggest novel application of lithium intercalated fullerides as electrodes in Li ions batteries. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.145901
DOI:
10.1103/PhysRevLett.102.145901
PACS:
66.30.H−, 72.20.−i, 81.05.Tp, 82.35.Lr
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