Sodium ion batteries[1] are another promising one for stationary batteries that pop up from time to time. Sodium is obviously abundant and cheap, and has simila

Sodium ion batteries[1] are another promising one for stationary batteries that pop up from time to time. Sodium is obviously abundant and cheap, and has similar properties to lithium. For grid storage, it’s heavier weight and less energy density isn’t a big issue. However like many alternative battery solutions it it’s the there yet for whatever reason. 1 https://spectrum.ieee.org/energywise/energy/batteries-storage/sodium-ion-batteries-poised-to-pick-off-large-scale-lithium-applications https://spectrum.ieee.org/energywise/energy/batteries-storag...