Tesla are very aware of graphene, but Litium is still the best choice in terms of the price/energy density/power density ratio - doing what you suggest would make the batteries prohibitively expensive, not to mention the range of the cars to be a lot less.
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Tesla are very aware of graphene, but Litium is still the best choice in terms of the price/energy density/power density ratio - doing what you suggest would make the batteries prohibitively expensive, not to mention the range of the cars to be a lot less.