Lithium is a crucial element in the clean energy supply chain, but the US currently imports about 99% of its lithium supply. Work under the prize helps support access to cost-effective, domestic sources of this critical mineral for batteries for stationary storage and electric vehicles - crucial to meet the Biden-Harris Administration's goals of 50% electric vehicle adoption by 2030 and a net-zero emissions economy by 2050.

"Lithium is an important part of the nation's energy future and our ability to decarbonise the economy," Jeff Marootian, principal deputy assistant secretary for energy efficiency and renewable energy, said. "We are excited about the innovations these three winners and all of the prize competitors achieved and look forward to what they do next to advance this technology and help us realise a secure domestic source of this critical mineral."

Geothermal brines often have high concentrations of minerals like lithium, salt, and zinc. While exact concentrations of these minerals depend on the location and surrounding geology, the use of direct lithium extraction (DLE) in geothermal brines offers a promising opportunity to source domestic lithium - while also generating clean electricity from geothermal resources. DOE's Geothermal Technologies Office (GTO) launched the Geothermal Lithium Extraction Prize to help cost-effectively advance and scale DLE technologies and techniques.

Over the course of two years, Geothermal Lithium Extraction Prize competitors advanced through three competition phases, moving from concepts developed in phase 1 through a design stage in phase 2 and finally to fabricating and testing prototypes in the third and final phase.

The winners are:

• Winning Team ($1 million): University of Illinois Urbana-Champaign―Team SelectPureLi, a Redox membrane for lithium hydroxide extraction
• Runner-Up ($500,000): University of Virginia―Team TELEPORT, targeted extraction of lithium with electroactive particles for recovery technology (TELEPORT)
• Runner-Up ($500,000): George Washington University―Team Ellexco, chemical-free extraction of lithium from brines

Funded by the Geothermal Technologies Office (GTO) and administered by the National Renewable Energy Laboratory, the American-Made Geothermal Lithium Extraction Prize is part of DOE's portfolio researching lithium extraction from geothermal brines. The portfolio also includes a joint $11 million funding programme by GTO and the Advanced Manufacturing and Materials Technologies Office to innovate technologies for extracting and converting battery-grade lithium from geothermal brines.

Got a story? Email: duncan.moore@aspermont.com