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CaptainNegative
Not only is this not a question but the numbers given don't add up to nearly half a million pounds.
Tade0
Also that weight is not "typical". That's roughly the weight of the larger (77kWh) battery pack of a Kia EV6 - a somewhat large vehicle.
Tagbert
Also, saying “must process ~25,000 pounds of brine“ suggests something much more intensive than “drying a saline solution in the sun”.
natch
Or it can be extracted from sea water, or it can be extracted from used batteries that are being recycled.

As the tech scales up worldwide, recycling will be a major factor in creating a closed loop (i.e. sustainable) system with the resources that are extracted.

One company working on the recycling end of this is Redwood Materials: https://en.wikipedia.org/wiki/Redwood_Materials,_Inc.

Tagbert
Have you looked at the numbers for an ICE vehicle?
D-Coder
One does not "dig up" brine. And I'm pretty sure most of it gets recycled.

How does this compare to a non-EV?

ianbutler
Sorry, to clarify where are you getting your numbers? I've no horse in this race but I'd like to follow along.