Can anyone comment on the feasibility/state of the art for extracting lithium from seawater? I've found an article [0] which describes a specially made membran

Can anyone comment on the feasibility/state of the art for extracting lithium from seawater? I've found an article [0] which describes a specially made membrane which allows lithium ions to pass, but nothing larger. If it's really possible to scale this up cheaply, the supply of lithium will be constrained by the supply of power, not scarce mineral deposits. [0] http://www.sciencedirect.com/science/article/pii/S0011916414006560 http://www.sciencedirect.com/science/article/pii/S0011916414...