The Tesla apparently uses LiNiCoAlO2 (NCA lithium ion). So just starting from the chemistry gets you to less than 4% lithium by weight (~3.8%). Throw in packaging and such and really, the individual cells are more like 2%. The cells apparently weigh ~50 grams, so 7000 of them weigh ~350 Kg (7000 is the Tesla cell count, really 6,831).
2.5% of 350 Kg is 8.75 Kg. So a slightly less conservative estimate scales your figures by a factor of 22.
Edit: The Model S probably uses NCA batteries (it's hard to say). Lithium is still only 7% by weight of LiCoO2 (Leaving at least a factor of 10).
2.5% of 350 Kg is 8.75 Kg. So a slightly less conservative estimate scales your figures by a factor of 22.
Edit: The Model S probably uses NCA batteries (it's hard to say). Lithium is still only 7% by weight of LiCoO2 (Leaving at least a factor of 10).