I've mentioned it here and it seems to upset some peeps but battery technology is the primary roadblock to EV. a tesla s needs 1000s of l-i computer batteries, there is nothing hi-tech about that. that's a go-around.
but things are changing:
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From an research perspective, the drive to build high-density batteries for electric vehicles is just starting. Sure, research on better batteries has been going on for years, but until the last year or two the electric-vehicle market was so small that universities, much less large battery manufacturers, didn't see it as a priority.
That's why Tesla Motors essentially stuffed a bunch of computer batteries into a car -- it was the best option available. A decade or two from now we may look back on the lithium ion-fueled Model S as a stepping stone to a more electrified world, one that is powered by the next generation of battery technology.
Research that could make lithium ion batteries obsolete
Scientists at the University of Waterloo in Ontario announced this week that they have made a breakthrough in lithium-sulfur battery technology that could increase an EVs range by 3 times with the same weight and a lower cost.
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The Scientific Breakthrough That Will Completely Change The Electric Vehicle Market