Research on Reductive Acid Leaching and Precipitation Regeneration of Spent LiNi_0.5Co_0.2Mn_0.3O₂ Cathode Material AITranslate

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Chinese Library Classification Number:TM910.4[电气工程—电力电子与电力传动]

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A new scheme of reduction leaching with malic acid and sodium bisulfite followed by carbonate precipitation to regenerate cathode materials in spent lithium-ion batteries was proposed.The effects were investigated of stirring speed, organic acid concentration, sodium bisulfite dosage, leaching temperature and leaching time on the leaching rates of Li, Co, Ni and Mn.The results show that the optimum leaching conditions are as follows: stirring speed of 400 r/min, malic acid concentration of 2.5 mol/L,sodium bisulfite dosage of 1.25 mol/L,leaching temperature of 90 ℃ and leaching time of 120 min.Under the above conditions, the leaching rates of Li, Co, Ni and Mn reach 99.91%,98.14%,99.27% and 98.43%,respectively.The performance of the regenerated cathode material was analyzed by XRD,SEM and electrochemical test.The results show that the first cycle discharge specific capacity of the regenerated LiNi_0.5Co_0.2Mn_0.3O₂ cathode material is 175.5 mA·h/g, and its capacity retention rate is up to 71.96% after 200 cycles.The performance of the regenerated cathode material is relatively excellent.