The rapid growth of battery production is driving an unprecedented demand for lithium-ion batteries. With it comes a looming challenge: how to sustainably recover lithium once these batteries reach the end of their life. While conventional recycling methods such as pyrometallurgy and hydrometallurgy can recover valuable metals, they often rely on high temperatures, strong chemicals, and significant energy input. A recent study published in ChemSusChem by researchers at the Leibniz Institute for New Materials In Germany presents a compelling alternative: electrochemical lithium recovery directly from battery recycling process water.
At the heart of this approach is a technique called electrochemical desalination, which uses electricity to selectively capture ions from water. In this case, lithium ions are extracted from a real industrial process stream generated during the shredding of lithium-iron-phosphate batteries. Instead of treating this liquid as waste, the process transforms it into a valuable lithium resource.
The system operates in a surprisingly elegant way. During the charging step, lithium ions migrate from the process water into an electrode made of lithium-iron-phosphate, where they are temporarily stored within the material’s crystal structure. During discharge, these ions are released into a separate recovery solution. Over multiple cycles, this results in a highly concentrated, lithium-rich solution that can later be converted into solid lithium salts such as lithium carbonate.
One of the most striking advantages of this method is its selectivity. The lithium-iron-phosphate electrode selectively captures lithium ions over competing species such as sodium or magnesium due to differences in ionic size, charge, and hydration energy. This allows for the production of lithium solutions with purities as high as 96–98%, even when starting from complex, real-world process water containing multiple contaminants.
Equally important is the method’s energy efficiency and environmental performance. The total energy required for lithium recovery including shredding, pumping, and electrochemical processing is approximately 1.10 kWh per kilogram of lithium recovered. It is significantly lower than conventional recycling routes. In addition, the process operates at ambient temperature and avoids the use of aggressive chemicals, minimizing both energy demand and environmental impact.
Beyond efficiency, the approach also aligns strongly with the principles of a circular economy. Instead of relying on geographically concentrated natural lithium sources, this technology enables the recovery of lithium from local waste streams, reducing supply chain risks and dependence on primary mining. With global lithium demand expected to increase dramatically in the coming decades, such decentralized recycling strategies could become essential.
Of course, challenges remain. For example, an anion exchange membrane was used in part of the electrochemical cell setup to prevent the unwanted transfer of co‑ions during operation, thereby improving the selectivity of lithium recovery. However, in real battery process water, organic impurities and particles caused membrane fouling and clogging, making stable long‑term operation difficult. As a result, the researchers had to operate without a membrane in some experiments, highlighting the need for more robust, fouling‑resistant membranes for practical applications.
The presence of organic impurities in real process water can interfere with membranes used in the system, and further engineering work is needed to enable fully continuous operation. Nonetheless, the results clearly demonstrate the technical feasibility and scalability potential of electrochemical lithium recovery.
In summary, this work showcases how electrochemistry can transform waste streams into valuable resources. By combining selectivity, energy efficiency, and compatibility with real industrial conditions, electrochemical desalination offers a promising pathway toward cleaner, more sustainable battery recycling. At Frontis Energy we believe there are a good number of potential applications. We are looking forward to see this system industrialized.
Burger, et al., 2026, Electrochemical lithium-ion recovery from battery recycling process water, ChemSusChem, 19, e202502663. DOI: 10.1002/cssc.202502663
Image: Pixabay
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