低共熔溶剂浸出废旧锂离子电池正极材料的机制研究OA

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.