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Cornell Method Restores Aging EV Batteries

Researchers at Cornell University have shown that a chemical bath can restore up to 95 % of the capacity of aging lithium‑ion batteries used in electric vehicles. The technique, called Direct Electrode‑to‑Electrode Regeneration (DEER), removes a thick solid electrolyte interphase (SEI) layer that builds up during repeated charge cycles and replaces it with a thin lithium fluoride coating that slows future SEI growth. In laboratory tests, batteries that had lost 20–30 % of their original range were returned to near‑original performance after a single DMI bath, and a second bath could recover additional capacity, though with diminishing returns. The DEER process costs about $15.25 per kilogram of battery, roughly half the $26.31 per kilogram cost of conventional pyrometallurgical recycling, and could be scaled to a closed‑loop manufacturing model. Cornell’s study, published in Energy and Environmental Science, argues that the method could reduce energy use, greenhouse‑gas emissions, and waste associated with lithium‑ion battery disposal. The authors note that the technique only works when capacity loss is due to SEI buildup, not structural damage or lithium loss. If widely adopted, the approach could extend the useful life of millions of retired EV batteries and lessen the environmental impact of the growing battery waste stream.

· Good News Network

The essential points

  1. 01DEER restores up to 95 % of a battery’s lost capacity by removing the SEI layer with a DMI chemical bath.
  2. 02A single treatment can return batteries that have lost 20–30 % of range to near‑original performance.
  3. 03The process costs roughly $15.25/kg, about half the expense of pyrometallurgical recycling, and can be scaled for closed‑loop manufacturing.
  4. 04The technique only works when degradation is from SEI buildup, not from structural damage or lithium loss.
The full brief

Researchers at Cornell University have shown that a chemical bath can restore up to 95 % of the capacity of aging lithium‑ion batteries used in electric vehicles. The technique, called Direct Electrode‑to‑Electrode Regeneration (DEER), removes a thick solid electrolyte interphase (SEI) layer that builds up during repeated charge cycles and replaces it with a thin lithium fluoride coating that slows future SEI growth. In laboratory tests, batteries that had lost 20–30 % of their original range were returned to near‑original performance after a single DMI bath, and a second bath could recover additional capacity, though with diminishing returns.

The DEER process costs about $15. 25 per kilogram of battery, roughly half the $26. 31 per kilogram cost of conventional pyrometallurgical recycling, and could be scaled to a closed‑loop manufacturing model.

Cornell’s study, published in Energy and Environmental Science, argues that the method could reduce energy use, greenhouse‑gas emissions, and waste associated with lithium‑ion battery disposal. The authors note that the technique only works when capacity loss is due to SEI buildup, not structural damage or lithium loss. If widely adopted, the approach could extend the useful life of millions of retired EV batteries and lessen the environmental impact of the growing battery waste stream.