I can't understand why Tesla doesn't seem to pay attention to graphene, which is just as efficient and plentiful, not scarce like lithium. Quote: Graphene can improve such battery attributes as energy density and form in various ways. Li-ion batteries can be enhanced by introducing graphene to the battery’s anode and capitalizing on the material’s conductivity and large surface area traits to achieve morphological optimization and performance. See http://www.graphene-info.com/graphene-batteries