pseudo plug in?

While I'm not quite sure exactly what you're describing keep in mind that there are no "free lunches" in the realm of physics/natural law. Conservation of energy dictates that if such a system were capable of capturing substantial quantities of energy from the motion of a vehicle that the vehicle would be required to expend more energy to accomplish the same amount of work. So no, generators on the wheels, no wind mills, etc, etc... The best solution is to waste as little of the original energy as possible by using the most efficient technologies available. Turns out that plugging into recharge a battery is the most efficient, furthermore electricity can be generated from a variety of localized sustainable sources such as wind and PV. Even when generated from a centralized coal plant it turns out that using that power in an EV/PHEV is cleaner than our gas cars.

 

I think you are talking about a motorised roller built into the floor, it would be cheaper to make a charger and connections to the battery. The range of the standard battery is very small and would make it uneconomical to charge it from mains power.