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 process or any other purity removal process on it. Does anyone could help to analyze the Raman spectra and XRD pattern of these two materials?
Usually one compares the position and intensity of the D (~1350cm-1) and G (~1570cm-1) bands. The intensity ratio I(D)/I(G), typically measured by height of the peaks, is correlated with the degree of crystallinity. The D band is associated with defects of the graphite lattice. Both a perfect graphite crystal and a purely amorphous carbon show no D band. The G band on the other hand is associated with ring vibrations in the graphite lattice.
From what I see, I would say that the commercial graphite has a much higher degree of crystallinity and less defects.
I hope that helps ;)
Check out: Ferrari, A. C., & Robertson, J. (2000). Interpretation of Raman spectra of disordered and amorphous carbon. Physical review B, 61(20), 14095.
Regarding the XRD pattern: The main diffraction peak refers to the (002) plane (interlayer scattering). Using the Bragg equation, you can easily calculate the interlayer distance d002 and the Scherrer equation gives you a lower boundary for the mean size of the crystalline domains (see wikipedia). The former might give you hints about impurites (atoms between layers) and the latter might be used to correlate to the I(D)/I(G) ratio.
Martin Wortmann Are there any impurities on the spent graphite based on these figures? I would be grateful if you could tell me more findings on these figures.
@ Zhao Hua Li Sorry, I dont think that I could tell from these diagrams.
- Badges
- Science method
- Similar topics
- Methodology
- Crystallography
- X-ray Diffraction