Sodium-ion batteries are an emerging form of electrochemical energy-storage technology. They have an energy density similar to lithium iron phosphate batteries, but they are more cost-effective, making them ideal for use in mid- to low-speed electric transportation and large-scale energy storage. Currently, sodium-ion batteries are in the early stage of industrialisation, with a clear technical roadmap not yet developed. This project proposes using low-cost, iron-based polyanion-type material as the positive electrode material for sodium-ion batteries. This will explore the potential for a reliable, scalable production technology roadmap to develop sodium-ion batteries with both low cost and an ultra-long lifecycle for large-scale energy-storage markets.