If this is the model you want, there are easier materials. Iron/air isn't mass efficient, but it's an absolutely stupid simple material and energy cycle to impl

If this is the model you want, there are easier materials. Iron/air isn't mass efficient, but it's an absolutely stupid simple material and energy cycle to implement. I personally believe iron/air batteries are an excellent candidate for industrial energy applications and large scale electric vehicles (trains, ships, heavy equipment, mining, shipping)