Iron-air batteries are considered as another candidate for electric vehicles currently being developed. Rechargeable metal-air batteries have an advantage over conventional batteries systems as only one reactant need to be contained within the battery. It has a lower specific energy than mechanically rechargeable cells but has the advantage of lower life cycle costs. Unlike zinc anodes the iron electrodes do not suffer gross shape change or redistribution of its active material upon prolonged cycling. However because of the lower specific energy of this cell most work on iron-air has been discontinued in favor of Zinc-Air.
