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Critical metalsCritical metals recoveryRecovery from waste lithium-ion batteries (LIBs)Lithium-Ion Batteries (LIBs) is vital for advancing energy technologies. This study investigates the leachingLeaching performance of a deep eutectic solvent (DES)Deep eutectic solvent, namely choline chloride (ChCl):L-ascorbic acid (LAA):H2O (2:1:6), for the selective extractionExtraction of Li, Co, Ni, and Mn from NMC811 cathodeNMC811 cathode materials. To the best of our knowledge, this DES has not previously been utilized for leaching NMC811, although it has shown promise in related systems. A design of experiments methodology was employed to systematically assess the effects of leaching temperature, solid-to-liquid ratio, and leaching duration. The ChCl:LAA:H2O (2:1:6) system achieved leaching efficiencies of 83.8% for Li, 100% for Co, 100% for Ni, and 94.5% for Mn. Thorough material characterization was performed before and after leachingLeaching to develop a deeper understanding of reaction mechanisms, phase transformations, and surface chemistry evolution. These findings demonstrate the efficacy of ChCl:LAA:H2O as a green and effective leachant for NMC811.

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Leaching of NMC811 Cathode Materials Using Deep Eutectic Solvent

  • 会议论文

  • 发表日期：

    2026年

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  • Rejwanur Rahman,
  • Andreas Schwetter,
  • Samantha Oakes,
  • Jihye Kim

摘要

Critical metalsCritical metals recoveryRecovery from waste lithium-ion batteries (LIBs)Lithium-Ion Batteries (LIBs) is vital for advancing energy technologies. This study investigates the leachingLeaching performance of a deep eutectic solvent (DES)Deep eutectic solvent, namely choline chloride (ChCl):L-ascorbic acid (LAA):H2O (2:1:6), for the selective extractionExtraction of Li, Co, Ni, and Mn from NMC811 cathodeNMC811 cathode materials. To the best of our knowledge, this DES has not previously been utilized for leaching NMC811, although it has shown promise in related systems. A design of experiments methodology was employed to systematically assess the effects of leaching temperature, solid-to-liquid ratio, and leaching duration. The ChCl:LAA:H2O (2:1:6) system achieved leaching efficiencies of 83.8% for Li, 100% for Co, 100% for Ni, and 94.5% for Mn. Thorough material characterization was performed before and after leachingLeaching to develop a deeper understanding of reaction mechanisms, phase transformations, and surface chemistry evolution. These findings demonstrate the efficacy of ChCl:LAA:H2O as a green and effective leachant for NMC811.