[bryanlarsen]

Lithium can be pulled from seawater. Japan might have to pay more for their lithium, but they can never be cut off from it.

[alephnerd]

Seawater based lithium extraction is very cost inefficient as it's basically just electrolysis.

This means the only options long term are Hydrogen and Sodium Solid State.

I'd recommend reading the Japanese government docs and presentations I linked above as they explain why Japan and it's companies are doing what they are doing.

[bryanlarsen]

$5/kg, 10-50 kg per vehicle. Not an obstacle.

https://cen.acs.org/materials/inorganic-chemistry/Can-seawat...