Lithium ion is just one type of battery. There are many including quite a few that don't involve exotic materials. For grid storage, energy density is a lot less important.

Even so, we're on track to produce li on batteries for cars by the twh per year. And most of those will have a second life in grid storage. That's before considering the effects of vehicle to grid storage.

There are no plans for nuclear anywhere close to the same scale. Changing that will require a debate about cost. This article does a great job of avoiding that topic entirely.