Researchers have made a prototype of an iron-ion battery with a mild steel anode, the capacity of which is reaches the level 55-60% Li-ion.
With the development of electronic devices, the need for their power supplies increases.. Due to limited lithium reserves, scientists are exploring technologies based on alternative materials.
The team from the Indian Institute of Technology Madras based the rechargeable battery on the ignored for many years iron, which has the same physicochemical properties as lithium, but with a higher redox potential of ions.
Vanadium oxide (V2O5) was used as the cathode for the iron-ion battery, due to the large distance between the layers in its structure. This feature allows iron ions to easily move and interact with the cathode, and just as easily return to the anode..
After testing various combinations of electrolytes, the scientists settled on ether containing dissolved iron perchlorate, which turned out to be the best option for an ionic conductive medium..
IIT Madras Team Made World’s First Iron Ion Battery for EVs
The capacity indicator of the prototype created under controlled conditions was 220 Wh / kg or 55-60% of the performance of a lithium-ion battery. When the device was manufactured under ambient conditions, the capacity decreased by 15-20%. The tested prototypes continued to operate for 150 charge and discharge cycles, maintaining 54% capacity and good stability after 50 cycles.
Iron ion battery cannot boast of a high capacity, but it made from the most common metal and has a high enough potential to be a cost-effective and safe alternative to lithium batteries.
A team of physicists is currently working to improve the performance of the device and find the best cathode materials..
We also previously reported on the development of a prototype battery with glass electrolyte, the capacity of which only grows over time.
text: Ilya Bauer photo: Indian Institute of Technology Madras