The current episode of EVTV had mention of improvements from 24m (which rose from the ashes of A123) and Samsung. 24m has a way of layering the electrolyte and Samsung had something to do with the electrodes. Now I need to watch it again.
Irrespective of heating, a fast recharge of a massive battery must be like a mini-lightning bolt passing through a cable you can grasp in your hand.
