And how do you cool the battery during such a fast charge? what % of the energy is lost in heat from the chemical reaction - even Tesla has to obey the laws of thermo dynamics.
Thinking about it from a thermofluids angle You could I suppose have a complex system of heat exchangers built in to the the battery pack and hook the car up to a water connection and flush chilled water (or better some non conductive fluid) through whilst charging but water and high voltage and amps are not the best of friends.
Now where did i put my steam tables :-)