The ten year old link states up to 80% efficiency as a possibility. Nothing in this current configuration literature on hydrogen production.Chalo wrote: ↑Aug 03 2021 2:08amhttps://www.alexhsain.org/blog/ironair
https://patents.google.com/patent/US20120187918A1/enI think the "less than 65%" charge efficiency I found was in an online discussion of iron air batteries, but actually referred to iron-nickel batteries. It looks like iron-air is even worse in that regard.Efficiency. An iron-air battery has an open circuit cell voltage of about 1.28V and a theoretical energy density of 764 Wh/kg. While the current densities are at least an order of magnitude higher than would be used for discharge of batteries for grid-scale electrical storage, there is a 0.5V difference between the charge and discharge voltages. This difference in charge/discharge voltages arises mainly from the poor performance of the air electrode. This voltage loss contributes significantly to the low round-trip efficiency of 50% of current iron-air batteries, 20% loss of capacity in 14 days, and 10% loss of faradic charge efficiency.
Regardless, they are some two years away (claimed) from having some production samples. I expect a wholesale shit storm for them if they come up with something useful.