Citation: Bo Hua DENG, Yong Fang LI, Hua Quan YANG. Impedance Characterization of the Film Formation Process at the Graphite Anodes[J]. Chinese Chemical Letters, ;2000, 11(10): 915-918. shu

Impedance Characterization of the Film Formation Process at the Graphite Anodes

1.
Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080;
2.
Department of Chemistry, Peking University, Beijing 100875

Received Date: 16 March 2000

Fund Project: This work was financially supported by the National 863 project (KJ951-A1-501). The authors thank Dr. Yuping Wu and Wenfeng Huang of Tsinghua University for their useful discussions.

In this paper, the formation mechanism of the passive SFI film at the natural graphite anodes was investigated with the electrochemical impedance spectroscopy (EIS). A characteristic semicircle was observed in the lower frequency range of the EIS spectrum for the irreversible charge process (lithium intercalation) at ca. 0.75V, 0.40V and 0.20V.
- Electrochemical impedance spectroscopy,
- surface film,
- graphite anodes,
- Li-ion battery
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