We wish to perform muon spectroscopic experiments on materials from two ceramic systems that are of interest for possible solid electrolyte applications in lithium-ion battery devices: (i) Li2NiGe3O8 and (ii) N-doped Li3+xVO4-xNx. Muon spectroscopy will provide us with a means of determining the key parameters of Li diffusion (Li-ion diffusion rates and activation energies) in our paramagnetic ion-containing systems. Similar data cannot be obtained using any other technique. We request 5 days of beamtime on the EMU beamline to perform these experiments.