The growing implementation of renewable resources has placed increased demand for cheap, safe and efficient means of storing the energy generated. Lithium and sodium ion batteries based on iron containing materials are most cost effective and promising technologies that can successfully fill this demand. However, despite the large number of candidates, no iron based electrodes exhibit improved performance over the existing material LiFePO4, first investigated ~20 years ago. This experiment aims to investigate several extremely promising and structurally interesting positive electrode materials for sodium and lithium ion batteries, such as LiFeSO4F (tavorite and triplite), Li2FeP2O7 and NaFe[Fe(CN)6]. By developing a complete understanding of how the structural changes influence the volumetric and gravimetric energy densities, higher performing materials can be designed.