DOI QR코드

DOI QR Code

A Study on the Deintercalation Reaction of Li-Graphite Intercalation Compounds


Abstract

Li-graphite intercalation compounds (GICs), synthesized at elevated temperature and pressure, were allowed to decompose spontaneously in the atmosphere. The decomposition processes were analyzed by of X-ray diffraction, DSC analysis, FT-IR measurements, UV/VIS spectrophotometry. The deintercalation reaction of the Li-GICs ceased after 6 weeks and only the residual compounds could be observed. A strong exothermic reaction was observed at 300 $^{\circ}C$ in thermal decomposition, and relatively stable decomposition curves were formed. A few endothermic curves have been observed at 1000 $^{\circ}C.$ After 6 weeks deintercalation reaction time of GICs, many exothermic and endothermic reactions were accompanied at the same time. In addition the reactions of the functional groups such as aromatic rings, nitrogen, $-CH_3$, $-CH_2$ etc. of GDIC obtained by the above reaction were confirmed by FT-IR spectrum. UV/VIS spectrophotometric measurement clearly shows the formation of a minimum energy value ($R_{min}$) for the compounds between Li-GICs as a starting material and Li-GDICs obtained until after 3 weeks of the deintercalation reaction, while they were no clear energy curves from 4 weeks of reaction time, because of the formation of the graphite structure, of high stages and of the Li compounds surrounding the graphite in the deintercalation reaction.

Keywords

References

  1. Electrochem. Soc. v.139 Scrosati, B. J.
  2. Plaenary lecture, 22nd Biennial Conference on Carbon Dahn, J. R.
  3. J. Elecrochem. Soc. v.139 Guyomard, D.; Tarascon, J. M.
  4. Elecrochimica Acta v.38 Tarascon, J. M.; Guyomard, D.
  5. Intercalation Chemistry Whittingham, M. S.; Jacobson, A. J.
  6. Intercalated Layered Materials Levy, F.
  7. Carbon v.13 Guerard, D.; Herold, A.
  8. Mat. Res. Bull. v.14 Billaud, D.; McRae, E.; Herold, A.
  9. Carbon v.33 Oh, W. C.; Bae, N. K.; Choi, Y. J.; Ko, Y. S.
  10. Mater. Res. Soc. Ext. Abs.,Graphite Intercalation Compounds: Science and Applications Endo, M.; Dresselhaus, M. S.; Dresselhaus, G.
  11. Ext. Abs., CARBON '95 Oh, W. C.; Cho, S. J.; Choi, Y. J.; Kim, M. K.; Ko, Y. S.
  12. Progress in Intercalation Research Muller-Warmuth, W.; Schollhorn, R.