Really? How do you know that? I’m not saying you’re wrong, it’s just surprising. Cell formulation is complex chemistry and physics. I know Tesla built a world class cell testing facility and have contracted with a world class cell testing professor (Jeffrey Dahn), but actually doing lab experiments on cell chemistry, that’s a different ball of wax. I find it very hard to believe Tesla had such a lab in 2011 when the Model S 18650 cell was being formulated.
I suppose it could be their IP in that they paid Panasonic to do the R&D work to formulate the cell, that would be possible...