Tesla
In Larry's last podcast he says We are working on the Cobalt-Nickel-Aluminum battery chemistry right now That's a chemistry Tesla is definitely involved in and maybe there are some scraps from Tesla in there, I couldn't say
https://www.howestreet.com/2019/08/15/american-manganese-ceo-discusses-the-unrecognized-value-in-amys-patents/
Sure sounds like there is a NDA with Tesla to me.