I don't think you realize how much lithium there is in the Earth's crust. I'll copy in something I wrote a while back...
The 100 mile Nissan Leaf uses 4kg of lithium in its batteries. Let’s say magic happens and between 2015 and 2035 we put 1.2 billion 200 mile range EVs on the world’s roads, each using 8kg of lithium in their batteries. (And that's if range increase comes only from more batteries rather than the more likely improved anodes and cathodes.)
That would mean that in that 20 year period we would need to produce 480,000 metric tons of lithium per year.
At 20 mg lithium per kg of Earth's crust, lithium is the 25th most abundant element. Nickel and lead have about the same abundance. There are approximately 39 million tonnes of accessible lithium in the Earth’s crust. An 81 year supply.
Argentina, Australia, Bolivia, Brazil, Canada, China, Portugal and Zimbabwe have roughly 13,000,000 metric tons of lithium that can be extracted. That's a 27 year supply.
Bolivia has 5.4 million of the 13 million tons. Over 11 years.
There are approximately 230,000,000,000 tons of lithium in seawater. A 479,167 year supply.
http://en.wikipedia.org/wiki/Lithium#TerrestrialAnd after that we could just recycle what we've already extracted.
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Since I wrote that we've discovered couple large finds in the US...
Western Lithium claims the Humboldt County (Nevada) site's deposits represent the fifth-largest lithium resource in the world. The Nevada Governor's Office of Economic Development says the state's overall lithium portfolio is even bigger.
"Nevada is lithium rich — second only to the size of deposits found in Chile," said Steve Hill, executive director of the Governor's Office of Economic Development.
http://www.therepublic.com/view/story/f899396a31a348f29371b83482f527b0/NV--Lithium-Production-NevadaA big find was recently announced in Wyoming. The find could contain as much as 118 million tons of lithium. That would be enough for 59 billion Nissan Leafs. (If I didn't experience a math failure.)
http://missoulian.com/news/state-and-regional/lithium-discovery-could-be-new-industry-for-wyoming/article_46d9c438-add8-11e2-be38-0019bb2963f4.html