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New 7Li-NMR Evidence for Lithium Insertion in Disordered Carbon

Published online by Cambridge University Press:  10 February 2011

S. Wang ,
H. Matsui ,
Y. Matsumura  and
T. Yamabe
S. Wang
Affiliation:
Fundamental Research Laboratories, Osaka Gas Co., Ltd., Osaka, Japan
H. Matsui
Affiliation:
Fundamental Research Laboratories, Osaka Gas Co., Ltd., Osaka, Japan
Y. Matsumura
Affiliation:
Fundamental Research Laboratories, Osaka Gas Co., Ltd., Osaka, Japan
T. Yamabe
Affiliation:
Division of Molecular Engineering, Faculty of Engineering, Kyoto University, Kyoto, Japan
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Abstract

In fully-charged carbon materials, we tried to determine the nature of the interaction between Li species and carbon using variable temperature measurements of the Li Knight shift Only one interaction between the Li species and graphite carbon was observed from room temperature to -10°C. However, while only one average interaction between the Li species and the disordered carbon was observed at room temperature, three kinds of interactions were observed at low temperature. These results provide direct evidence for the model which explains why the discharge capacity of the carbon electrode with a disordered structure as an anode can exceed the theoretical capacity of a graphite anode in lithium ion rechargeable batteries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 545
Copyright
Copyright © Materials Research Society 1998

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References

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