摘要：采用X射线光电子能谱和X射线衍射谱图分析废弃锂离子电池热处理前、后富Co破碎产物中Co元素的化学状态。结果表明,当原样中Co元素以LiCoO2形式存在时,热处理后生成LiCoO₂、Co₃O₄、Co₂AlO₄等较复杂产物,其中Co₃O₄信号较强;当原样中Co元素以Li_1-xCoO₂和LiCoO₂这2种化学态存在时,热处理后主要生成Co₃O₄,此外有未分解的Li_1-xCoO₂、CoF₃和Co金属单质;热处理后Co元素得到进一步富集,部分Co元素的化学态得到有效证明。

关键词：废弃锂离子电池；热处理；化学态

Abstract：The chemical state of Co element from Co-rich crushed products of spent lithium ion batteries after thermal treatment was analyzed by XPS and XRD.The results indicate that Co element exists in the form of LiCoO₂.After thermal treatment,complex products including LiCoO₂,Co₃O₄,and Co₂AlO₄ etc.are generated in which Co₃O₄ has strong signal.Li_1-xCoO₂ and LiCoO₂ are two main chemical states of Co element in the original sample.The chemical state changes to Co₃O₄ after thermal treatment.Besides,there are undecomposed Li_1-xCoO₂,CoF3 and Co.Co element is enriched after thermal treatment and chemical state of Co element have been certified.

Keywords：spent lithium ion battery;thermal treatment;chemical state