Lithium Ion Battery: What the hell does the cobalt do? (and why is it evil)

This is a follow up Quick Topic to answer a question that has gotten some traction on a previous video reply thread.
It's a question I'm asked once in a while so I thought I'd address it.

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Видео Lithium Ion Battery: What the hell does the cobalt do? (and why is it evil) канала Twelve Wing Productions