Li 4 C 60 Fulleride Polymer Displays Superionic Conductivity
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Li 4C60 Fulleride Polymer Displays Superionic Conductivity Typical solid-phase ionic conductors, called superionic conductors, are disordered or glassy materials with interstitial sites due to defects or imperfect stoichiometry, and not intrinsic to the crystalline structure. Ions diffusing within the unoccupied sites give rise to ionic conductivities comparable to those observed in the molten state. Despite the large free volume in their crystal structure, fullerides have not (and would not be expected to, except at high temperatures) displayed ionic conductivity because the interstitial sites are connected by narrow channels. Recently, however, M. Riccò and co-workers at the University of Parma, Italy; D. Quintavalle and A Jánossy at Budapest University of Technology and Economics, Hungary; and G. Csányi of the University of Cambridge, UK, showed that Li 4C 60 forms a twodimensional polymer with extraordinary superionic conductivity at temperatures
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