The think is, Lithium is really only good for mobile battery applications, because of energy density. For stationary use, other chemistries offer better lifetime, lower cost, better safety, etc., and that is the reason why alternatives matter.
Li-ion batteries should be looking in the rear view mirror, Sodium is catching up, and if energy density is the big thing, "Sugar batteries" that run on maltodextrin as fuels are being developed as well. They use enzymatic catalysts and air that reduce the maltodextrin, which creates a voltage. It is only .5 volts per cell, but the ED and stacking of cells, and the energy density (10X Li-Ion) makes them extremely interesting. non toxic as well.
For stationary grid purposes, I like Nickel-Iron batteries. Seriously tough, they can take a lot of abuse, They don't have super energy retention, but plenty enough to handle grid purposes. Need more? Build a bigger pad. There is a lot of experience with these, NYC uses Nickel-Iron rechargeable in its subway system.