Lithium is only created in stellar events (Big Bang, super novas). There’s no natural way for it form on Earth.

As a result all lithium deposits we’re created during the formation of the planet as it coalesced out of interstellar dust. Consequently the distribution of Lithium around the planet is pretty even. There’s no “hot spots” of high concentration, and every country has a supply proportional to its land mass.

That, plus the relative abundance of Lithium, means it’s unlikely that fighting a war for Lithium will ever make sense. Much easier and cheaper to just dig in your own backyard, than fight for someone’s backyard that has the same dirt in it.