模拟废旧锂离子电池湿法冶金浸出液再生铝掺杂LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)正极材料

Regeneration of Al-doped LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode material by simulated hydrometallurgy leachate of spent lithium-ion batteries

采用共沉淀法制备均相Al掺杂的LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)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Al^(3+)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Ni^(2+)的浓度增加。在0.1C下的初始比容量为167.4 mA·h/g,在1C下循环400次后容量保持率为79.1%。此外,这种Al掺杂样品具有更高的倍率性能和更小的电化学阻抗。这些发现为工业上通过掺入锂离子电池回收过程中产生的Al^(3+)杂质,重新合成具有更好电化学性能的正极材料的工艺开发提供了参考。

A uniform Al-doped LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) 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 Al^(3+) 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 Ni^(2+).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 Al^(3+) impurities produced during lithium-ion battery recycling.