Abstract
Lithium insertion reactions carried out on the potassium silicophosphates, KT 3P 6Si 2O 25, KMo 3P 6Si 2O 25. KMo 2TiP 6Si 2O 25 and KSn 2TiP 6Si 2O 25 show the formation of Li xM 3P 6Si 2O 25 phases with optimal stoichiometries of x = 2, 2, 2 and 1, respectively. These compounds exhibit 3D intersecting tunnel structures. Lithiation does not result in any observable changes in the electronic conductivity of the hosts which remain electronic insulators. Complex impedance measurements confirm that these compounds have relatively low activation energies for ionic conduction in agreement with the observed ion-exchange properties.
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