Porous Anodes for Iron-Air BatteriesCopyright: O. Bakirmann
Among metal-air batteries, iron-based rechargeable batteries are of particular interest because they possess a variety of desirable features, including inexhaustible raw materials, low costs (<100$/kWh), high robustness and environmental friendliness. These properties make the iron-air battery ideally suited for applications in grid-scale electrical energy storage systems. However, iron-based rechargeable batteries suffer from multiple limitations like the wasteful evolution of hydrogen during charging, poor rate capability and a relatively low material utilization.
In order to overcome the limitations mentioned before, this work will be concerned with the development of porous iron-anodes for operation in alkaline electrolyte. For this goal, a production process has to be developed in order to produce stable electrodes. The process development is likewise accompanied by an investigation of the influence of important process parameters like the manufacturing pressure and the binder material on the mechanical stability as well as the electrochemical performance of the electrode. Iron-anodes that emerge from this work are meant to provide the basis for future attempts on mitigating the parasitic evolution of hydrogen and the passivation of iron in alkaline solution which can be achieved by addition of bismuth salts into the electrode.