氨基磺酸溶液浸出废锂离子电池负极活性材料中的锂

Leaching lithium from anode active material of spent lithium ion batteries with sulfaminic acid solution

随着锂离子电池的广泛应用,产生了大量废锂离子电池,其负极活性材料中积累了高品位的锂。锂作为一种稀有金属,对其进行回收利用很有意义。选取了无毒、稳定性好的氨基磺酸作为浸出剂,浸取废锂离子电池负极活性材料中的锂,考察了预处理方式对负极活性材料成分和结构的影响以及浸出条件对锂浸出率的影响。结果表明:600℃下煅烧4 h,可完全去除附着在负极活性材料表面的有机物;在氨基磺酸浓度0.75 mol/L、固液比5 g/L、浸出温度40℃、浸出时间45 min的最佳浸出条件下,负极活性材料中锂浸出率达97.2%。

A large number of spent lithium-ion batteries(LIBs)were produced with the widely application of LIBs.The anode active materials of spent LIBs accumulated high grade lithium.It was worthy of recycling the rare metal lithium for its valuable.Due to the advantages of non-toxicity and good chemical stability,sulfaminic acid was used as leaching agent to leach Li+from anode active materials of spent LIBs.The effects of pretreatment process on composition and structure of anode active materials and the effects of leaching conditions on Li+leaching rate were investigated.The results showed that:The organic matters on the surface of anode active materials could be removed by calcination at 600℃for 4 h;The Li+leaching rate was 97.2%under the optimum leaching conditions of sulfaminic acid concentration 0.75 mol/L,solid-to-liquid ratio 5 g/L,leaching temperature 40℃and leaching time 45 min.