Chem. J. Chinese Universities

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Studies on Graphite Anode During Electrochemical Scan Cycles by EIS, Raman Spectroscopy and XRD

ZHUANG Quan-Chao1,2, XU Jin-Mei1, TIAN Jing-Hua1, FAN Xiao-Yong1, DONG Quan-Feng1, SUN Shi-Gang1*   

    1. State Key Lab of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemial Engineering, Xiamen University, Xiamen 361005, China;
    2. School of Materials Science and Engineering, China University of Mining & technology, Xuzhou 221116, China
  • Received:2007-09-27 Revised:1900-01-01 Online:2008-05-10 Published:2008-05-10
  • Contact: SUN Shi-Gang

Abstract: The graphite anode during electrochemical scan cycles in 1 mol/L LiPF6-EC-DEC-DMC electrolyte solutions was investigated by EIS, Raman spectroscopy and XRD. It was found that the resistance of the SEI film increases almost linearly during the prolonged cycling in the 4—10 electrochemical scan cycles. However, the interface resistance between the graphite anode and the electrolyte solution decreases due to the decrease of the charge transfer resistance. After the electrochemical scan cycles, the active material on the surface of graphite anode is exfoliated and pulverized, and become amorphous, while the bulk of the active material remains unchanged.

Key words: Graphite anode, EIS, Raman spectroscopy, XRD, SEI film

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