Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-29T12:33:33.026Z Has data issue: false hasContentIssue false
  • English
  • Français

The kinetic and thermodynamic analysis of Li+ in multi-walled carbon nanotubes

Published online by Cambridge University Press:  01 February 2011

Kezhi Lin ,
Yanhui Xu  and
Xiaolin Wang
Kezhi Lin
Affiliation:
Department of Chemical Engineering, Tsinghua University Beijing, 100084, P. R., China
Yanhui Xu
Affiliation:
Department of Chemical Engineering, Tsinghua University Beijing, 100084, P. R., China
Xiaolin Wang
Affiliation:
Department of Chemical Engineering, Tsinghua University Beijing, 100084, P. R., China
Get access

Abstract

The multi-walled carbon nanotubes (MWNTs) prepared by CVD were used in electrochemical intercalation reaction with Li+. The results of the first several charge-discharge cycles showed that the reversible capacity of the MWNTs was larger than the theoretical capacity of graphitized carbon. The equivalent circuit of the Li+ intercalated into the MWNTs was simulated The diffusion coefficient calculated based on the results of the impedance was in the range between 1 ∼ 4×10−10 cm2s−1. The diffusion coefficient calculated based on the technique of the chronoamperometery was 3.5×10−10 cm2s−1. The diffusion coefficients of the Li+ reacted with MWNTs was in the range of that of the most carbon materials. Using EMF method the partial molar entropy (ΔSx) and partial molar enthalpy (ΔHx) of the Li+ intercalated into the MWNTs were calculated as a function of × in Lix C6 at different temperatures. The values of ΔSx were in the range of 150 ∼ 550 J mol-1K-1. The values of ΔHx at 35 °C were in the range of 40∼110 kJ mol−1. Both of the ΔSx and ΔHx were lower and the changes were smaller than the values of some other carbonaceous materials. By analyzing the results conclusion is obtained that Li+ exist in MWNTs with different types which include adsorption and intercalation types.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K6.8
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Iijima, S.. Nature, 56, 11 (1991).Google Scholar
2. Qin, L.C., Iijima, S., Mater Lett, 311, 30 (1997).Google Scholar
3. Yang, Z., WU, H., Chem Phys Lett, 235, 343 (2001).Google Scholar
4. Braidy, N., Khahani, M.A.E., Botton, G.A., Carbon, 2835, 40 (2002).Google Scholar
5. Yudasaka, M., Zhang, M., Iijima, S., Chem Phys Lett, 549, 323 (2000).Google Scholar
6. Frackowiak, E., Gautier, S., Gaucher, H., Bonnamy, S., Beguin, F., Carbon, 61, 37 (1999).Google Scholar
7. Frackowiak, E., Gautier, S., Gaucher, H., Bonnamy, S., Beguin, F., Carbon, 61, 37 (1999).Google Scholar
8. Popov, A.V., Metlin, Y.U.G., Tretyakov, Y.U.D., J Solid State Chem, 23, 31 (1980).Google Scholar
9. Ho, C, Raistrick, ID, Huggins, R. A., J Electrochem Soc, 343, 127 (1980).Google Scholar
10. Bard, A. J., Faulkner, L. R., Electrochemical Methods Fundamentals and Applications. John wiley &Sons, Inc 1980.Google Scholar
11. Gao, J., Wu, H., Electrochim Acta, 1753, 45 (2000).Google Scholar