废旧锂离子电池三元正极材料酸浸研究

采用有机苹果酸(C_4H_6O_5)和还原剂H_2O_2作为浸出剂,对废旧锂离子电池三元正极材料的酸浸过程进行研究,从苹果酸浓度、还原剂用量、固液比、浸出时间和浸出温度等5个方面对浸出条件进行优化,并对浸出机理进行探讨。当酸的浓度为1.25 mol/L、还原剂的体积分数为1%、固液比为30 g/L时,在80℃条件下水浴80 min,Li、Ni、Co和Mn等4种元素的浸出率最高,都达到95%以上。

Study on the acid leaching of ternary anode materials in spent Li-ion battery

Organic malic acid (C4 H6O5) and reducing agent of H2O2 were used as leaching agent to leaching the ternary anode materials of spent Li-ion battery.Five aspects of experimental condition,such as the concentration of malic acid,reducing agent,solid-liquid ratio,leaching time and leaching temperature were optimized,the mechanism of the malic acid leaching was discussed.The experimental results showed that when the concentration of acid was 1.25 mol/L,the volume quantity of reducing agent was 1％,solid liquid ratio was 30 g/L,bathed the materials in water for 80 min under the condition of 80 ℃,the leaching rate of four elements (Li,Ni,Co and Mn) were optimal,all above 95 ％.