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Lithium Ion Diffusion Through Glassy Carbon Plate

Published online by Cambridge University Press:  10 February 2011

M. Inaba ,
S. Nohmi ,
A. Funabiki ,
T. Abe  and
Z. Ogumi
M. Inaba
Affiliation:
Dept. of Energy and Hydrocarbon Chem., Graduate School of Engineering, Kyoto Univ., Sakyo- ku, Kyoto 606–01, Japan
S. Nohmi
Affiliation:
Dept. of Energy and Hydrocarbon Chem., Graduate School of Engineering, Kyoto Univ., Sakyo- ku, Kyoto 606–01, Japan
A. Funabiki
Affiliation:
Dept. of Energy and Hydrocarbon Chem., Graduate School of Engineering, Kyoto Univ., Sakyo- ku, Kyoto 606–01, Japan
T. Abe
Affiliation:
Dept. of Energy and Hydrocarbon Chem., Graduate School of Engineering, Kyoto Univ., Sakyo- ku, Kyoto 606–01, Japan
Z. Ogumi
Affiliation:
Dept. of Energy and Hydrocarbon Chem., Graduate School of Engineering, Kyoto Univ., Sakyo- ku, Kyoto 606–01, Japan
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Abstract

The electrochemical permeation method was applied to the determination of the diffusion coefficient of Li+ ion (DLi+) in a glassy carbon (GC) plate. The cell was composed of two compartments, which were separated by the GC plate. Li+ ions were inserted electrochemically from one face, and extracted from the other. The flux of the permeated Li+ ions was monitored as an oxidation current at the latter face. The diffusion coefficient was determined by fitting the transient current curve with a theoretical one derived from Fick's law. When the potential was stepped between two potentials in the range of 0 to 0.5 V, transient curves were well fitted with the theoretical one, which gave DLi+ values on the order of 10−8 cm2 s−1. In contrast, when the potential was stepped between two potentials across 0.5 V, significant deviation was observed. The deviation indicated the presence of trap sites as well as diffusion sites for Li+ ions, the former of which is the origin of the irreversible capacity of GC.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 493
Copyright
Copyright © Materials Research Society 1998

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References

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