Does a 2 yro need 20kg of lithium? Which translates into does every single person on earth need 20kg of lithium at the same time? What if 30 people rids a bus?

Besides, lithium can be recycled and if for some reason we're still short, it's a good thing we're starting to build sodium ion batteries, as there's over 283x that amount available.

And true, we can't mine asteroids yet. But the earth receives terawatts of power from the sun, daily.