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Japan finds a way to recover 90% of lithium from old EV batteries
(www.techspot.com)
This is a most excellent place for technology news and articles.
More my comment was an extreme oversimplification. The point is more so that every type of battery chemistry has pros and cons and there's no silver bullet "better" battery. Every application has different demands and constraints and must be looked at individually, as you iterated on regarding grid storage.