Say Lithium becomes essentially free because we find so much of it…would that drastically lower battery costs? Is our current supply of lithium limiting production?
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As proof of that there are sodium-ion batteries on the market right now, but they're not price-competetive yet[0] despite using largely the same infrastructure.
[0] The potential is there though as they have an important advantage: you can safely discharge a sodium-ion battery to 0V for storage/transportation.