Good news!
"The big picture: Cornell University researchers have developed a way to recycle lithium-ion batteries without breaking them down into raw materials first. Their method, called Direct Electrode-to-Electrode Regeneration, or DEER, restores worn battery electrodes so they can be used again. The results suggest that some EV batteries could be refurbished at lower cost and with less energy than conventional recycling methods, though the process will not work for every degraded cell. ...
In the Cornell process, researchers take apart used cells and place the electrodes in an electrochemical bath containing 1,3-dimethyl-2-imidazolidinone, or DMI. The treatment removes the thicker SEI layer without destroying the electrode itself. The renewed electrodes can then be used to build new battery cells.
The researchers reported that regenerated cells recovered up to 95% of their original capacity. They also found that treated batteries degraded more slowly than untreated ones. ...
Cornell estimates that DEER-recycled cells could cost $15.25 per kilogram, compared with $26.31 per kilogram for recycling through pyrometallurgy or hydrometallurgy. ..."
From the abstract:
"Lithium-ion battery recycling remains constrained by processes that recover metals at the expense of electrode integrity, while even direct recycling typically requires shredding to black mass followed by binder removal, separation, and full electrode refabrication.
Here, we introduce direct electrode-to-electrode regeneration (DEER), a simultaneous electrochemical regeneration of used NMC and graphite electrodes from end-of-life batteries in their intact form by dissolving the passivating electrode–electrolyte interphase (EEI).
DEER employs 1,3-dimethyl-2-imidazolidinone (DMI), a high donor number solvent that creates a thermodynamic environment favorable for solubilizing redox inactive EEI components. DEER dissolves the thick EEI on both used electrodes while preserving electrode integrity, enabling up to 95% capacity regain and improved cycling stability with a residual LiF-rich interphase.
Operando Raman, operando IR, and post-mortem NMR directly track the electrochemically driven dissolution of carbonate-derived EEI species in the used DMI-based recycling electrolyte. Technoeconomic and life-cycle analyses show that DEER reduces the cost of recycled cell manufacturing by 56% relative to pyro- and hydrometallurgy, while lowering energy use and greenhouse gas emissions. Overall, DEER establishes the first validated pathway to directly regenerate and reuse electrodes harvested from truly end-of-life batteries, converting the key interfacial bottleneck into a controllable dissolution process and opening a practical route toward electrode level circularity."
Electrochemical bath recycles critical minerals in batteries (original news release, dated 9/6/2026)
Direct electrode-to-electrode regeneration of end-of-life batteries via electrode–electrolyte interphase dissolution (open access)
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