Electrochemical lithium extraction from geothermal brines

Salty water brought up by some geothermal wells contains lithium, a battery ingredient. An electrically controlled electrode can take up lithium and then release it into a separate liquid. Can larger electrodes keep selecting lithium after long use with hot, dirty brine?[1] [2]

In a demonstrated extraction cell, brine flows past an iron-phosphate electrode. Applied potential drives lithium ions into its crystal structure; reversing the potential and changing the feed releases them into a separate solution. The target is to preserve that lithium selectivity and capacity in industrially manufactured electrodes during sustained hot-brine exposure. The complete process also includes purification and conversion to a battery raw material.[2]

Success with a synthetic feed does not establish long life in real brine.[2]

The January 2025 demonstration identifies these commercialization gaps. Treatment-train reviews and July 2026 economic assumptions do not validate an electrode’s field lifetime.[1] [2] [3]

Geothermal brines could add another source of lithium for batteries. But an electrode that needs frequent replacement can make recovery expensive. Reliable capture and release would help turn a promising feedstock into a continuing supply.[1] [2]

Lithium recovery could use a resource associated with geothermal energy production, widening the sources available to battery manufacturing. The 2025 cell study’s economic model is sensitive to electrode lifespan, while a separate facility model identifies substantial costs elsewhere in the treatment train. Improving a selective electrode is therefore valuable when the improvement survives repeated operation and the surrounding processing costs. Neither model demonstrates a field lifetime.[1] [2] [3]