The commercial graphite is purchased from the market. And the recycled graphite is simply and mechanically recycled from the copper foil of a spent lithium-ion battery. There is no leaching or any other purity removal process on it. Does anyone could help to analyze these two spectra?
Hi Zhao Hua Li The raman of your commercial graphite powder tells you that most of the carbon atoms present in the powder are arranged in layer-by-layer configuration (i.e. the G-band at ~1550 cm-1 is dominating). Moreover, in each of the interlayers; the carbon atoms (in your commercial graphite powder) are also forming hexagonal rings (i.e. the 2D band at ~2800 cm-1 is clearly present). However, some small defects in the atomic orientation are also present (i.e. D band at ~1450 cm-1 is also present).
I hope now you can use the above explanation to analyze your "recycled graphite powder". You may note that the D-band has appeared also most equivalent to the G-band (i.e. the intensity ratios of D and G band is almost 0.8-0.9) which means that there are alot of defects in the layer-by-layer orientation of the carbon atoms. The disorientation has also damaged the hexagonal rings (i.e. the 2D band is very shallow).
Hi Zhao Hua, the intensity ratio of D band (ca. 1350 cm-1) to G dand (ca. 1560 cm-1) for the recycled graphite powder is increased compared to the commercial graphite powder, which indicates that the defect degree of graphite powder is increased after cycling. In addition, the intensity of 2D band (ca. 2700 cm-1) for the recycled graphite powder is decreased compared to the commercial graphite powder, suggesting the partial destruction of the hexagonal ring structure.
Would you help me to further analyze the XRD pattern of these two samples? Gangyong Li Syed Waqar Hasan
Hi Zhao Hua, the diffraction peak intensity of the commercial graphite powder is stronger than that of the recycled graphite powder, indicating the decreased graphitization degree for the recycled graphite powder. The XRD result is consistent well with the Raman result.
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