I think it is a voltage issue. To recharge fast you need really high voltages which are unsafe to deal with.
Well,,,, are the voltages unsafe to deal with in a car wreak?
I think that you don't know what you are talking about.
The electric vehicle and it's charging device use pretty much the same voltage (likely 12 volts.) The charger is biased a little higher to give positive Amp flow to the battery. Slower deep charging uses low Amps, where as a quick charge would use higher Amps. The downside of high Amp quick charge is that the equipment is going to get damn hot from the parasitic resistance of the wire cable.
With advanced technology batteries the charge time can be greatly decreased, but you still have the waste heat to deal with.
Low temperature superconductive materials can help with minimizing the waste heat inducing resistance, but that's still in the labs.