Toyota may be making a bet on the future of the batteries in its electric cars as well. Tin is an alternative to graphite in Lithium-Ion battery cell anodes - it is 2 to 3 times better at storing energy.
See the wikipedia entry on Lithium-Ion batteries as well as
http://www.forbes.com/sites/uciliawang/2012/05/23/tin-the-secret-to-improving-lithium-ion-battery-life/
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