Sodium-ion batteries are real in China. BYD to build 30 GWh sodium battery plant

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Can reject/waste from desalination plants be used for sodium batteries?

Would have to do extra refining, since there are other dissolved things besides table salt.

Still, they'd likely have to separate out impurities from mined sodium deposits as well, so it sounds like a good use of the by-product from the desalination process where possible

Exactly, it's just being dumped right now as a pollutant.