We propose to examine the microscopic dynamic properties of a class of solid ion conductors known as ?plastic crystals?. The name ?plastic? reflect the ability of these materials to respond to an applied stress by deforming without breaking, quite like a chewing-gum. This class of ion-conducting materials is particularly interesting for portable battery applications, because the mechanical flexibility of plastic-crystalline ion conductors reduces the problem of poor electrical contact with the electrodes caused by volume changes of conventional solid ion conductors, while eliminating the leakage problems associated with liquid ionic solutions.In particular, our aim is probing, by means of neutron experiments, a possible connection between ion diffusion and molecular dynamics in a particular plastic crystal.