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Mechanism of Extracting Cathode Materials from Spent Lithium-ion Batteries Using Deep Eutectic Solvents
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Peng SHEN1, Quanmin DING1, Yuekun WANG1, Hu LIU2, Xiangyang LOU2, Suyun LIU2, Yongmei LIANG1
Hydrometallurgy of China | 2026, 45(2) : 161 - 169
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Hydrometallurgy of China | 2026, 45(2): 161-169
• Experiment Research •
Mechanism of Extracting Cathode Materials from Spent Lithium-ion Batteries Using Deep Eutectic Solvents
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Peng SHEN1, Quanmin DING1, Yuekun WANG1, Hu LIU2, Xiangyang LOU2, Suyun LIU2, Yongmei LIANG1
Affiliations
  • 1.School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang　050018, China
  • 2.Institute of Technology for Future Industry, Shenzhen University of Information Technology, Shenzhen　518000, China
Published: 2026-04-20 doi: 10.13355/j.cnki.sfyj.2026.02.004
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The recycling of valuable metals from spent lithium-ion batteries has significant economic and environmental benefits. The preparation of a low-viscosity eutectic solvent (DES) with excellent reducing properties using choline chloride, citric acid and ethylene glycol was studied. The DES was characterized by FT-IR, NMR and TG, and was used for the leaching of ternary lithium (NCM) cathode materials. The coordination dissolution mechanism of DES leaching NCM cathode materials was investigated by XRD, UV-Vis and FT-IR spectra. The results show that under the optimal leaching conditions of ethylene glycol addition of 30%, leaching temperature of 100 ℃, leaching time of 90 min, and liquid-solid mass ratio of 50/1 for DES, the leaching rates of Li, Mn, Co, and Ni in the cathode material are 95.98%, 96.73%, 98.58%, and 96.31%, respectively. The metal ions in the leachate can be efficiently recovered through the co-precipitation of anhydrous oxalic acid, and the precipitation rate of transition metal ions such as Mn, Co and Ni can reach over 95%. This recycling method can provide certaion technical reference for the green recycling of used lithium-ion batteries.

deep eutectic solvents  /  spent lithium-ion batteries  /  cathode materials  /  valuable metals  /  green recycling  /  dissolution mechanism
申鹏, 丁全民, 王越坤, 刘虎, 娄向阳, 刘素云, 梁永梅. 低共熔溶剂浸出废旧锂离子电池正极材料的机制研究. 湿法冶金, 2026 , 45 (2) : 161 -169 . DOI: 10.13355/j.cnki.sfyj.2026.02.004
Peng SHEN, Quanmin DING, Yuekun WANG, Hu LIU, Xiangyang LOU, Suyun LIU, Yongmei LIANG. Mechanism of Extracting Cathode Materials from Spent Lithium-ion Batteries Using Deep Eutectic Solvents[J]. Hydrometallurgy of China, 2026 , 45 (2) : 161 -169 . DOI: 10.13355/j.cnki.sfyj.2026.02.004
Appendix
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Year 2026 volume 45 Issue 2
127
31
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Article Info
doi: 10.13355/j.cnki.sfyj.2026.02.004
  • Receive Date：2025-11-05
  • Online Date：2026-09-28
  • Published：2026-04-20
Article Data
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History
  • Received：2025-11-05
  • Revised：2025-12-15
Funding
Affiliations
    1.School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang　050018, China
    2.Institute of Technology for Future Industry, Shenzhen University of Information Technology, Shenzhen　518000, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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