Scientists develop method to restore aging EV batteries without raw material breakdown

Cornell University researchers developed the DEER method that restores worn lithium-ion battery electrodes without recycling into raw materials. Treatment in an electrolytic bath with DMI removes excess SEI layer: restored cells recovered up to 95% capacity and degrade slower (0.042% vs 0.072% per cycle).

• Restored cells recovered up to 95% of original capacity
• Degradation cut from 0.072% to 0.042% per cycle, effect lasts about 800 cycles
• Repeat treatment returned battery to 90% capacity
• Cost estimate: $15.25/kg vs $26.31/kg for pyro- and hydrometallurgy