Selective lithium recovery from black powder of spent lithiumion batteries via sulfation reaction:phase conversion and impurities influence  

作　　者：Hao Liu Jia-Liang Zhang Guo-Qiang Liang Meng Wang Yong-Qiang Chen Cheng-Yan Wang 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing,100083,China [2]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing,100083,China [3]Beijing Key Laboratory of Green Recycling and Extraction of Metals,Beijing,100083,China

出　　处：《Rare Metals》2023年第7期2350-2360,共11页稀有金属（英文版）

基　　金：financially supported by the Key R&D Program of Zhejiang(No.2022C03074);the National Natural Science Foundation of China(Nos.51834008 and 51874040)。

摘　　要：The aim of this study is to present a new understanding for the selective lithium recovery from spent lithium-ion batteries(LIBs)via sulfation roasting.The composition of roasting products and reaction behavior of impurity elements were analyzed through thermodynamic calculations.Then,the effects of sulfuric acid dosage,roasting temperature,roasting time,and impurity elements were assessed on the leaching efficiency of valuable metals.Characterization methods such as X-ray diffraction(XRD),scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS),and X-ray photoelectron spectroscopy(XPS)were employed to analyze the phase transformation mechanism during roasting process.The results indicate that after sulfation roasting(n(H_(2)SO_(4)):n(Li)=0.5,550℃,2 h),94%lithium can be selectively recovered by water leaching and more than 95%Ni,Co,and Mn can be leached through acid leaching without the addition of reduction agent.During the sulfation roasting process,the lithium in LiNi_(x)Mn_(y)Co_zO_(2)is mainly converted to Li_(2)SO_(4),while the Ni,Co and Mn are first transformed to sulfate and then converted into oxide form.In addition,impurity elements such as Al and F will combine with lithium to form LiF and LiAlO_(2),which will reduce the leaching rate of lithium.These results provide a new understanding on the mechanisms of phase conversion during sulfation roasting and reveal the influence of impurity elements for the lithium recovery from spent LIBs.

关 键 词：Spent lithium-ion batteries(LIBs) Thermodynamic calculations Sulfation roasting Impurity elements Conversion mechanism 

分 类 号：TF826.3[冶金工程—有色金属冶金] X705[环境科学与工程—环境工程]