I'm not trying to be mean, but do you even understand what you're talking about? Do you understand how nitrous works? Nitrous only works on combustion engines, not electric motors.
I don't want to dog on you, just suggest that you do a little research before you put an idea forward.
I recommend you go to a few sites:
How engines work
how nitrous oxide works
how electric motors work
Read through that site and you'll understand why nitrous is not applicable for these cars.
EDIT: nvm. I didn't realize you were posting about CO2, not N2O. I still don't think it would be a very worthwhile idea. It would be a pain to rig up, a pain to buy new bottles, and the speed would be very short-lived and only suitable for drag races.