Key Takeaways
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Cornell University scientists created a chemical bath method called DEER that restores aging EV batteries to up to 95 percent of their original capacity.
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The process removes a restrictive buildup on the electrodes, allowing the cleaned batteries to retain their charge longer than factory-new ones.
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The new technique costs $15.25 per kilogram, making it significantly cheaper than traditional recycling methods which cost $26.31 per kilogram.
A cleaner approach to battery restoration
Scientists at Cornell University have developed an innovative chemical bath method that could drastically change how electric vehicle batteries are handled at the end of their lifecycle. Instead of shredding aging batteries through traditional pyrometallurgy, the new process can restore up to 95 percent of a battery’s original charge capacity.
How the regeneration process works
As lithium-ion batteries undergo hundreds of charge cycles, a thick layer known as solid electrolyte interphase (SEI) accumulates on the electrodes, restricting electron flow and reducing overall range. The Cornell team introduced a technique called Direct Electrode-to-Electrode Regeneration, or DEER. By submerging the extracted electrodes in a specialized chemical bath, the restrictive SEI buildup is effectively washed away.
Once cleaned, the rejuvenated electrodes regain nearly all their potential and can be placed back into the battery pack. Surprisingly, batteries treated this way actually maintained their charge longer than brand new batteries fresh from the factory. If the capacity eventually drops again, a second bath can replenish the range, though to a slightly lesser extent.
Lowering costs and emissions
Current recycling methods involve shredding and melting batteries to extract precious metals like cobalt, lithium, and nickel. This pyrometallurgical process is highly corrosive and expensive. The DEER method is significantly more affordable, costing $15.25 per kilogram compared to the $26.31 per kilogram price tag of traditional recycling.
The researchers detailed their findings in the journal Energy and Environmental Science, highlighting the broad environmental and economic benefits. “This electrode-level regeneration framework provides a scalable pathway toward closed-loop battery manufacturing with substantially reduced cost, energy consumption, and greenhouse gas emissions, supporting more sustainable electrification at the system level,” the study authors explained.
