Sure, the "right conditions" being "cheaper than other sources". :-) There are a few things that we extract from seawater right now... common salt, obviously (

Sure, the "right conditions" being "cheaper than other sources". :-) There are a few things that we extract from seawater right now... common salt, obviously (though a lot of that is also mined), magnesium, bromine... It's definitely not a completely cockamamie idea, but I have no idea whether this particular process is enough cheaper than existing sources to make it worthwhile. They claim $5 USD/kg for electrical costs. Capital costs are unspecified. Looks like lithium metal goes for about $80-85/kg, so it seems promising, depending on what kind of capital investment is required.