A lot going on with salt batteries, it’s hard to say who is going to come out on top/or make significant progress and gains from this technology.
Lithium
Lead
Zinc
Nickel
Cadmium
Silver
Cobalt
Sodium
Sulfur
Alkaline
Nuclear
Water
Aluminum
And that’s not all of the chemistry’s put into a cell(when I say chemistry’s I mean cells made up with materials listed above).
But wherever Sodium ends up, I hope it is in wind, solar, or hydro storage to dump into the grid, on demand.