vanadiumI think we'll have all riden off into the rgz sunset before this becomes a factor, but the vanadium redox battery is one of the most promising new energy technologies out there, and it could mean a very big future is here for vanadium. I think that anything vaguely energetic will have crazy amounts of money thrown at it in the next 5-50 years.
https://www.ceic.unsw.edu.au/centers/vrb/
https://www.vrbpower.com