The Iron-ion Battery From India

Newly developed at the Institute of Technology in Madras, iron-ion batteries are safe, clean and stable. They can’t be recharged as many times as lithium-ion batteries, but for specific uses they offer advantages.

Further Reading

India Develops the World’s First Iron-ion Battery
A room temperature multivalent rechargeable iron ion battery with an ether based electrolyte: a new type of post-lithium ion battery