the amount of energy you can get in a battery depends on the strength of the electron donor and the electron acceptor AND it has to be a reversible reaction. Lithium is about as good an electron donor as you can get, though the much cheaper but heavier sodium could work. Theoretically you could react lithium with fluorine or some compound thereof and get more energy, but then you have a hard time getting the fluorine to give up its electron. It may be possible to get another 10-15% by fiddling with the battery internal structure, but that’s about it. Lion batteries have about 200Whr/kg but gasoline has 9500Whr/kg ie gas carries 47.5 times as much energy as a lithium battery. Battery cars today are just better versions on the battery cars of the late 19th century with the same fundamental limitations.
All good points especially the last...pure fun. That said, the direction of technology is always smaller, faster, cheaper or from a different direction... Years ago a friend who knew a lot about computers for the time he lived in - explained there was an absolute limit to how much data a floppy could hold...which was true and also not relevant today. Maybe a type of 'transformer' is needed to make energy taken from the air convert it to usable energy for a car. Where is Nikola when we need him?