We have recently presented a novel method to study ion-dynamics in solids using muSR via the hopping rate (nu). We have previously and successfully applied this method to study ion-diffusion in battery-type materials LixCoO2, LixNiO2, LiCrO2 and finally also NaxCoO2. In this proposal we aim to study potassium dynamics in the related KxCoO2 compound. This compound is well known to display exotic potassium vacancy ordering as a function of K-content (x). In analogy with the closely related NaxCoO2 we believe that a detailed understanding of K-dynamics is needed in order to disentangle this compounds low-temperature magnetic properties. To the best of our knowledge, no previous attempts have been made to study ion-dynamics in KxCoO2.