Determination of the lithium ion content in cathode materials, which is currently performed by inductively coupled plasma mass spectrometry (ICP−MS), involves tedious procedures and error‐prone preparation. This work introduces a new methodology to quickly determine the lithium content in spent cathode materials (LiNi_xMn_yCo_zO₂, x + y + z = 1, NMC) using a thermalgravimetric analysis, which bypasses the use of ICP−MS and significantly reduces the cost and time required for determining the lithium content. Based on this new method, a new approach is developed to identify spent cathode materials suitable for direct relithiation recycling. Finally, these new methods have been applied to investigate the effectiveness of direct electrochemical−relithiation on recycling the spent cathodes, and provide insights for future development of direct battery materials recycling.

中文翻译：

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快速测定废阴极中锂的含量，直接用于电池回收

阴极材料中锂离子含量的测定目前通过电感耦合等离子体质谱法（ICP-MS）进行，涉及繁琐的程序和容易出错的准备工作。这项工作介绍了一种新的方法，可以快速确定废阴极材料中的锂含量（LiNi _x Mn _y Co _z O ₂，x + y + z= 1，NMC）使用热重分析，从而绕过了ICP-MS的使用，并显着降低了确定锂含量所需的成本和时间。基于这种新方法，开发了一种新方法来识别适用于直接再石化回收的废阴极材料。最后，这些新方法已被用于研究直接电化学再结晶对废阴极的回收利用的有效性，并为直接电池材料回收的未来发展提供了见识。