It's not directly covered in the article but LiFePO4 which are the new popular cells for most things don't require manganese or cobalt so they are much cleaner

It's not directly covered in the article but LiFePO4 which are the new popular cells for most things don't require manganese or cobalt so they are much cleaner than older lithium cells. So I can't directly answer your question, but there is no doubt that CO2 production for lithium cell manufacturing is much lower now than it was in 1990 and it should keep dropping as car manufacturer flip to LiFePO4.