Recently, Indian researchers announced the development of a rechargeable iron-ion battery, which uses low-carbon steel as the anode, and has the advantages of high cost performance and high storage capacity.
Related research results were recently published in the journal Chemical Communications of the Royal Society of Chemistry. According to the paper, the iron-ion battery developed by the research team of the Indian Institute of Technology Madras Branch uses low carbon steel as the anode and vanadium pentoxide as the cathode. The electrolyte is an ether-based electrolyte containing iron perchlorate.
Studies have shown that this battery can perform 150 cycles of charge and discharge, and can maintain 54% of electricity at the end of 50 cycles of charge and discharge, showing good stability. When such a cell is fabricated under certain conditions, its energy density can reach 220 watt-hours per kilogram, which is about 60% of that of a lithium-ion battery. The energy density of such a battery fabricated in a general environment is close to 40% of that of a lithium ion battery.
The researchers say that if pure iron is used as the anode, iron ions do not easily move from the anode to the cathode and return to the anode during charging, but the small amount of carbon present in the low carbon steel promotes this cycle. They believe that iron-ion batteries are more stable during charging, prevent battery short-circuits, and are less expensive than conventional lithium-ion batteries.
The team's next step is to try different cathode materials to further improve the performance of the iron-ion battery.