The use of ionic liquids for electrochemical devices such as supercapacitors, dye sensitised solar cells and lithium ion batteries has led to significant advances in technology. In lithium ion battery technology, the fact that ionic liquids are inherently conducting and have a wide electrochemical window and low flammability makes them an ideal electrolyte medium. Despite the significant advantages of the ionic liquid based electrode, the structure of the lithium solvation in the system is still widely debated. A range of structures have been proposed for the lithium including solvation complexes containing pairs of Li+ (Li+¿¿¿O=S=O¿¿¿Li+) as well as more extensive chains/aggregates. We aim to study the dissolution of Li(NTf2) in [C2mim][NTf2] using isotopically labelled ionic liquid and Li to understand the structure as a function of the Li concentration.