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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
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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

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References

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