We propose to study the crystal structure of the inverse spinel Li3CrV2O8 using variable temperature powder neutron diffraction. By conducting these neutron experiments, we will be able to determine where Li resides within the crystal structure, and from this we will be able to determine the lithium diffusion pathway in this promising Li-ion battery material. We will also be able to use the data to determine the oxygen site positions and thermal parameters, and how any cation mixing present in the material may vary with temperature.This information will allow us to better understand the functional properties of the inverse spinel Li3CrV2O8, and how to optimise these to improve performance.