A research team based at Technion-Israel Institute of Technology has reported the development of a new class of batteries that have greater capacity, a faster discharge rate and are rechargeable. The difference is in the cathode, which is made from unusual iron-based molecules known as iron (VI) or "super-iron" compounds that absorb more electrons than manganese dioxide currently used in most batteries. These batteries have a 50 per cent energy advantage over commercially-available alkaline and metal hydride batteries ( Science , Vol 285, August 13, 1999).
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