Researchers from the Biotechnology Group at Tarbiat Modares University in Tehran, Iran, have developed a groundbreaking method for recovering lithium (Li) and manganese (Mn) from spent lithium-ion batteries (LIBs) that could reshape the recycling landscape. Led by Tannaz Naseri, the study published in the journal Heliyon presents an environmentally friendly bioleaching technique that leverages the natural capabilities of a sulfur-oxidizing bacterium, Acidithiobacillus thiooxidans, to produce biogenic sulfuric acid.
Traditional recycling methods often rely on harsh chemicals that pose significant environmental risks. In contrast, this innovative approach introduces biogenic sulfuric acid in a step-wise manner, enhancing the metal recovery process. The researchers found that this gradual addition significantly improved the leaching efficiency of Li and Mn, achieving recovery rates of 93% and 53%, respectively, at a high pulp density of 60 g/L. Notably, the leaching time was cut in half, dropping from 16 to just 8 days.
“This study shows that gradually adding biogenic sulfuric acid can efficiently recover Li and Mn from waste LIBs,” Naseri stated, emphasizing the dual benefits of the method. Not only does it enhance recovery rates, but it also minimizes the generation of hazardous byproducts typically associated with conventional recycling processes.
The implications of this research extend beyond environmental benefits. The reduction in chemical usage and processing time can lead to significant cost savings for companies involved in battery recycling. By lowering energy needs and decreasing greenhouse gas emissions, this method positions itself as a sustainable alternative to traditional recycling methods. The potential for high-purity product recovery—over 90% for manganese hydroxide and lithium carbonate—further enhances its commercial viability.
As the demand for lithium-ion batteries continues to rise, driven by electric vehicles and renewable energy storage, the need for efficient and sustainable recycling solutions becomes increasingly critical. This innovative bioleaching technique not only addresses environmental concerns but also opens up new economic opportunities in the recycling sector, making it an attractive option for companies looking to enhance their sustainability practices.
The research by Naseri and her team marks a significant step forward in the quest for greener battery recycling methods. As industries seek to minimize their environmental footprint while meeting growing resource demands, this study published in Heliyon highlights a promising pathway for the future of lithium and manganese recovery from spent batteries.