[jdlshore]

The linked article addresses that. Modern batteries are lithium-iron, without the rare cobalt and nickel. Sodium batteries are also in development, but lithium is turning out to be so cheap and abundant that investment in the sodium batteries isn’t economical.

[defrost]

Grid storage batteries don't have the same weight constraint as vehicle batteries which opens the door to many other combinations that have a lower energy density but are cheaper per GW despite weighing more per GW.

[throwaway473825]

Sodium-ion batteries have extreme good performance in low-temperature environments. CATL is working on sodium-LFP dual-power batteries to get the best of both worlds:

https://www.catl.com/en/news/6401.html

That's mainly for EVs though.