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Electrochemical Properties of Nitrogen-Substituted Carbon and Organofluorine Compounds

Published online by Cambridge University Press:  10 February 2011

T. Nakajima ,
M. Koh  and
K. Dan
T. Nakajima
Affiliation:
Division of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto, 606–01, Japan
M. Koh
Affiliation:
Division of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto, 606–01, Japan
K. Dan
Affiliation:
Division of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto, 606–01, Japan
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Abstract

The CxN samples(C14N-C62N) prepared with a nickel catalyst had the higher crystallinity and less pyridine-type nitrogens existing at the edge of graphene layers than CxN prepared in the absence of a catalyst. With increase in the deposition temperature of CxN, the cy-cleability for electrochemical intercalation-deintercalation of lithium ions was improved and the profile of the charge-discharge curve approached that of graphite due to increase in the crystallinity and decrease in the incorporated nitrogens. CxN-coated graphites demonstrated gradual increase in the potential at the last stage of lithium ion deintercalation process.

The effect of fluoroester-mixing in 1 M LiClO4-EC/DEC was also investigated at a low temperature. It was found that CHF2COOCH3 with a low molecular weight and a small number of fluorine atoms was effective as a mixing agent.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 581
Copyright
Copyright © Materials Research Society 1998

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References

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