Superionic conductivity in the Li4C60 fulleride polymer

M. Riccò, M. Belli, M. Mazzani, D. Pontiroli, D. Quintavalle, A. Jánossy, G. Csányi

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Abstract

We report on the extraordinary superionic conductivity in the fulleride polymer Li4C60, a crystalline material with no disorder. Li7, NMR, and dc frequency dependent conductivity show uncorrelated ionic hopping across small energy barriers (ΔEa∼200meV) and an ionic conductivity of 10-2S/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.

Original languageEnglish
Article number145901
JournalPhysical review letters
Volume102
Issue number14
DOIs
Publication statusPublished - Apr 6 2009

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Riccò, M., Belli, M., Mazzani, M., Pontiroli, D., Quintavalle, D., Jánossy, A., & Csányi, G. (2009). Superionic conductivity in the Li4C60 fulleride polymer. Physical review letters, 102(14), [145901]. https://doi.org/10.1103/PhysRevLett.102.145901