Lemon-powered breakthrough recovers 95% metals from battery waste

Researchers at Rice University have developed an innovative method to recover up to 95% of valuable metals from discarded lithium-ion batteries using a microwave-induced plasma pretreatment followed by a mild acid wash with citric acid—commonly found in lemons. This approach addresses critical supply chain vulnerabilities for battery minerals, which are limited and unevenly distributed globally, while also mitigating environmental risks posed by battery waste often ending up in landfills. The plasma treatment alters the structure of metal compounds in shredded battery material ("black mass"), making metals like lithium easier to extract at room temperature without harsh chemicals or high energy inputs. A significant advancement of this method is the efficient recovery and restoration of graphite, which constitutes about 22% of a battery’s weight but is rarely reclaimed due to damage during conventional recycling. The plasma process cleans and repairs graphite, enabling it to perform effectively as an anode when reused in batteries. This contrasts with traditional industrial recycling, which typically focuses on cathode materials and uses energy-intensive, chemically harsh processes