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Can Flow Batteries Finally Beat Lithium?
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
Their claim about lithium being rare is nonsense as well. There's no lithium shortage, there's more a shortage of refineries and battery packaging plants (which means by building more, batteries will continue getting cheaper) and other rare earth metals, which is more of an issue, but like you say, the harder to source ones are being phased out of battery design.