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Can Flow Batteries Finally Beat Lithium?
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
I'm not sure on the global percentage, but they're becoming far more common. Most of the top selling EVs where I live (Tesla Model Y/3, BYD Atto 3, BYD Dolphin, MG ZS EV) all use lithium iron phosphate (LFP) batteries.