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Samsung delivers 600-mile solid-state EV battery as it teases 9-minute charging and 20-year lifespan tech
(www.notebookcheck.net)
This is a most excellent place for technology news and articles.
And if I understand correctly, they are safer because there is less chance of parts touching inside. I don't know the correct t terminology, but one of the big problems with current li-ion batteries is that if they get physically damaged, parts inside can touch, which basically starts a short/chain reaction that turns into a dangerous thermal runaway.
Also if I remember correctly the guy that invented li-ion invented some kind of solid state battery with glass right before he died. I'm assuming this technology stems from that.
Please correct me if I'm wrong on any of this. Knowledge is power.