It's much cheaper to buy NiMH cells than lithium. Electric vehicles are expensive as they are already. Lithium would just make the price too unattractive, even by tree-hugger standards.
No tree hugger here buuuuut...
Not if everyone ONLY produced Lithium Ion Batteries. The only reason why it is expensive is due to the Battery Manufacturers having their teeth into the public. It is just like Fuel and the Oil industry. Why would they upgrade to anything better when they only make half as much money? Not that it will ever happen but... If the World as a whole would pull their heads out of their asses, only use the best available product, then sink more money into development of the best product, our world would run exponentially more efficient. This would allow us to learn and progress instead of just giving all of our efforts to the entity that can pump our world dry of resources that will not replenish themselves for millions of years.
Think of it this way...Why in the hell are there more than say 100 Wheel Bearings? If you really believe that the standard DOT approved vehicle could not cut it down to 100 different Wheel Bearings that are proven to last, not fail, that Automotive manufacturers MUST use in production of said DOT approved vehicles? If one lasts longer than the others at a rated load the weaker one gets removed. Vehicles can still retain their originality but only have the BEST of the BEST Wheel Bearings that are good for a million miles. Our world is asinine. Think of how much production goes into SOLELY the production of MILLIONS of different Wheel Bearings for road going Cars/Trucks.
Of course this is just is an example. There are a plethora of these comparisons in every day life. It really is sad that we as Human Beings are this incompetent especially with our population growing out the wazoo daily.
Thus starts the endless discussion...