关键词: 锂离子电池, 负极活性材料, 分析测试

Abstract: 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.

Key words: lithium-ion secondary batteries, negative electrode active materials, analytical test