Researchers at Princeton University and the U.S. Department of Energy’s Argonne National Laboratory have published results from a new electrochemical recycling process that achieves 99.2% recovery of lithium, 99.4% recovery of cobalt, and 99.1% recovery of nickel from spent lithium-ion battery cathodes—rates that significantly exceed current commercial recycling benchmarks. The peer-reviewed study, published in the journal Nature Energy in late November 2025, describes a low-temperature, acid-free technique that the team says could dramatically reduce the cost and environmental footprint of battery material recovery.
The process, which the researchers have termed “selective electrodissolution,” operates at under 80°C and uses a water-based electrolyte solution rather than the concentrated sulfuric or hydrochloric acid baths employed in conventional hydrometallurgical recycling. In laboratory-scale tests on cathode materials from NMC-622 and NMC-811 batteries, the method recovered individual metals in battery-grade purity (above 99.5%) without the need for extensive downstream purification steps.
How It Works
Conventional hydrometallurgical recycling dissolves cathode materials in strong acid solutions, producing a mixed metal leachate that must then be separated through solvent extraction, precipitation, and filtration—a multi-step process that generates significant chemical waste and consumes substantial energy. Pyrometallurgical approaches, used by companies like Umicore and Glencore, smelt batteries at temperatures exceeding 1,400°C, which recovers cobalt and nickel effectively but typically loses lithium and manganese to slag.
The Princeton-Argonne technique takes a different approach. Spent cathode material is placed in an electrochemical cell where a controlled voltage selectively dissolves one metal at a time from the cathode structure. By tuning the voltage and electrolyte composition, the researchers can extract lithium first, followed by cobalt, then nickel and manganese—each into a separate solution stream. This eliminates the need for post-dissolution separation and dramatically reduces chemical reagent consumption.
“The key insight is that different metals in a layered oxide cathode have different electrochemical dissolution potentials. By operating at the right voltage window, we can pull them out one at a time, as if peeling back layers of an onion. The result is near-complete recovery with minimal waste.” — Dr. Meng Li, Principal Investigator, Princeton Department of Chemical and Biological Engineering
Scaling Challenges and Industry Response
The results have generated significant attention from both the research community and the recycling industry, but observers caution that translating laboratory performance to commercial scale involves substantial technical and economic hurdles. The published experiments were conducted on gram-scale cathode samples under controlled conditions, and the researchers acknowledged that processing whole battery cells—which require disassembly, shredding, and black mass separation before cathode material can be isolated—introduces additional complexity.
Energy consumption is another open question. While the process avoids high-temperature smelting, the electricity required for electrodissolution at industrial throughputs has not yet been characterized. The team estimates that a commercial-scale system processing 10,000 tonnes of cathode material per year could be operational within five to seven years, contingent on securing development funding and an industry partner.
- Lithium recovery: 99.2%, compared to 50–70% in pyrometallurgy and 80–90% in conventional hydrometallurgy
- Cobalt recovery: 99.4%, comparable to best-in-class hydrometallurgical processes
- Nickel recovery: 99.1%, with battery-grade purity achieved without additional refining
- Acid consumption: Zero—the process uses a neutral electrolyte solution
- Operating temperature: Below 80°C, compared to 1,400°C+ for pyrometallurgy
Outlook and Implications
Several established recycling companies have expressed interest in the technology. Redwood Materials, founded by former Tesla CTO JB Straubel, has an existing research partnership with Argonne and has previously licensed Argonne-developed recycling intellectual property. Li-Cycle and Ascend Elements, two other major North American recyclers, have also referenced electrochemical recovery in their technology development roadmaps.
If the process proves commercially viable, it could address one of the persistent economic challenges in battery recycling: the cost of lithium recovery. Under current methods, lithium recycling is often marginally profitable or unprofitable, particularly when lithium carbonate prices are below $15,000 per tonne—as they were for much of 2025. A low-cost, high-yield lithium recovery technique makes recycling economically attractive across a wider range of market conditions.
The Princeton-Argonne research represents a decisive step toward what the battery industry has long pursued: a recycling process that is simultaneously clean, efficient, and economically competitive with virgin material extraction. The technology’s path from laboratory to factory floor will be closely watched as the first major wave of end-of-life EV batteries arrives later this decade.
