Re: Reaction!
What could possibly go wrong?
All risks are relative. If you had ten times the energy density of a current lithium battery you'd be around the energy density of gunpowder. But that's still in very rough terms a tenth of the energy density of petrol or diesel, which is a risk most people seem happy with, so for automotive use I think we can say that a worst case accident with this speculative battery technology is still going to be a whole lot safer than the worst case car accident for existing liquid or gas fuel technologies.