I’m pretty sure lithium can be found in plenty of other places, it’s just that lithium mines aren’t established for them. I remember reading stories about large lithium deposits being found in Europe.

Apparently Australia actually extracts the vast majority of the world’s lithium, roughly twice that of China: https://ourworldindata.org/data-insights/the-worlds-lithium-is-mined-in-just-a-handful-of-countries