This tbh. Also, you can totally make batteries without lithium, they're just not going to be as light. Which isn't really an issue for stationary storage. As an example, Nickel-Iron also has the advantage of not being flammable - which is kinda desirable for home applications anyway.

Edit: Also also, on extremely productive days in terms of renewable energy, you can just make hydrogen. Not the most efficient but that you can simply burn or turn back into electricity again.