Our work on LSTN showed that it exhibits favourable electrochemical properties, i.e. rapid diffusion of lithium into the structure at low temperatures and the ability to reversibly intercalate 0.5 mol of Li+ per formula unit. A sloping discharge profile suggested that the intercalation reaction is a gradual solid solution type reaction toward the lithium rich phase. However, what we observed in both neutron and synchrotron diffraction patterns was instead two phase behaviour. While it was possible to obtain a stable model for the synchrotron diffraction pattern, the resolution of the neutron data was not high enough for a stable refinement. The inherent similarity of the two phases led to peak overlap, even at high diffraction angles, preventing precise analysis of electrochemically intercalated lithium. The resolution and intensity of HRPD is therefore required to solve this problem.