模拟废旧锂离子电池湿法冶金浸出液再生铝掺杂LiNi0.5Co0.2Mn0.3O2正极材料

采用共沉淀法制备均相Al掺杂的LiNi0.5Co0.2Mn0.3O2正极材料,以利用Al对再生镍钴锰(NCM)正极材料的正面改性作用,并改善锂离子电池回收过程中繁琐和高成本的除杂过程.当浸出液中的Al3+含量为过渡金属(Ni、Co和Mn)总量的1％(摩尔分数)时,制备的Al掺杂NCM正极材料中晶格氧和Ni2+的浓度增加...

Regeneration of Al-doped LiNi0.5Co0.2Mn0.3O2 cathode material by simulated hydrometallurgy leachate of spent lithium-ion batteries

A uniform Al-doped LiNi_0.5Co_0.2Mn_0.3O₂ cathode material was prepared using a coprecipitation method to take advantage of the positive effect of Al on regenerated NCM (Ni, Co, Mn) cathode materials and ameliorate cumbersome and high-cost impurity removal processes during lithium-ion battery recycling. When the Al³⁺ content in the leachate was 1 at.% with respect to the total amount of transition metals (Ni, Co, and Mn), the produced Al-doped NCM cathode material increased concentrations of lattice oxygen and Ni²⁺. The initial specific capacity at 0.1C was 167.4 mA·h/g, with a capacity retention of 79.1% after 400 cycles at 1C. Further, this Al-doped sample showed improved rate performance and a smaller electrochemical impedance. These findings provide a reference for developing industrial processes to resynthesize cathode materials with improved electrochemical performance by incorporating Al³⁺ impurities produced during lithium-ion battery recycling.