Scientists turn PFAS pollutants into lithium for greener batteries

Scientists at Rice University have developed a new method for extracting lithium using PFAS pollutants. The technique, detailed in Nature Water, could turn hazardous waste into a valuable resource for battery production. It also offers a way to tackle the growing problem of PFAS-contaminated materials while cutting energy and water use in lithium mining.

The research team, led by postdoctoral researcher Yi Cheng and professor James Tour, focused on repurposing PFAS-loaded waste. Their process involves mixing contaminated granular activated carbon with brine. Electrothermal heating then releases fluorine, which reacts with lithium ions to form lithium fluoride.

Distillation separates the lithium fluoride at a lower temperature than other fluoride salts, allowing for selective recovery. The recovered material was successfully tested in lithium-ion battery electrolytes, maintaining stability and performance. This suggests the method could provide a reliable alternative to traditional brine extraction, which often demands large amounts of water and energy. Beyond lithium production, the approach addresses a pressing environmental issue. PFAS—persistent pollutants found in filtration materials—are typically difficult to dispose of safely. By integrating them into lithium recovery, the team aims to reduce waste while improving the sustainability of battery supply chains. Similar efforts are underway globally. In Germany, the AGR Gruppe and Hochschule Ruhr-West have explored using sorption mats to safely deposit PFAS waste. Australian researchers, including Dr. Xuemei Li and Associate Professor Cheng Zhang, are collaborating with Chemours and Advanced Nanomaterials to convert PFAS into battery components through mechano-chemical processes. Meanwhile, the Fraunhofer-Institut ISC in Germany focuses on PFAS-free alternatives, though their work centres on avoidance rather than direct recycling.

The new method could reshape both lithium extraction and waste management. By turning PFAS-contaminated materials into a useful resource, it may lower the environmental impact of battery production. Further development will determine whether the process can be scaled for industrial use.