废锂离子电池负极活性材料的分析测试

目前关于废锂离子电池资源化的研究主要集中在正极贵金属和负极铜材料的分离回收和精制方面，但对负极活性材料的资源化研究很少。本文采用XRD、SEM、GC-MS、ICP-AES等检测手段对废锂离子电池负极活性材料中石墨的结构、有机物的种类以及Li、Gu等金属的含量进行测试分析。结果显示，其主要组分石墨的本体结构基本无变化，仍保持完整的层状结构，但是其中含有一定量的有机物质，如有机电解质及增塑剂等。经过提纯，可以将其作为石墨原料进行资源化再利用；此外，稀有金属Li含量较高，为31.03 mg/g，分离回收的价值较高。

Characterization and analysis of the negative electrode active materials in spent lithium-ion secondary batteries

At present，the research on spent lithium-ion secondary batteries is mainly focused on the separation recovery and refinery of precious metals in positive materials and copper in negative materials. But the research on negative active materials is rare. In this paper，the negative electrode active materials in spent lithium-ion secondary batteries are tested by XRD、SEM、GC-MS、ICP-AES，including the structure of graphite，the kinds of organic matter，and metal contents. The results show that there is basically no change in the graphite material body structure，it still keeps the complete layer structure. However，it contains a certain amount of organic material，such as organic electrolyte and plasticizer，etc. It can be reused after purification. What is more，the concentration of Li is high，with the value of 31.03 mg/g. Regarding the recovery of negative electrode active materials，the separation recycling of Li also should be concerned.