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The crystal structure of the inorganic surface films formed on Mg and Li intercalation compounds and the electrode performance

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Abstract

A crystallographic approach was applied to elucidate the influence of the nature of the surface films on the electrochemical behavior of Li and Mg intercalation compounds. This paper presents two examples: (1) protection of graphite electrodes by Li2CO3 surface films, and (2) the unique electrochemical behavior of Mg-containing Chevrel phases (MgCP) obtained by different synthetic routes. In the former case, the elucidation of the protection mechanism and the explanation of the high performance of such protected electrodes are based on the analysis of possible Li-ion motion in the carbonate crystal structure. In the latter case, a combination of synthesis, electrochemistry and XRD analysis was used to explain an unusual phenomenon: the difference between the excellent electrochemical behavior of the Chevrel phase (CP) based on Cu-leached Cu2Mo6S8 (CuCP), and the poor electrochemical activity of the high-temperature synthesized MgCP, with the same phase composition. It is shown that this phenomenon is caused by MgO formation on the surface of the latter material. The different surface chemistry of the MgCPs obtained by the two different synthetic routes was substantiated by revealing the correlation between the electrochemical activity and the chemical stability of these materials under ambient atmosphere conditions.

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Acknowledgments

Partial support for this work was obtained from the ISF, Israel Science Foundation and ATU Ltd/Israel. This paper is a part of Ph.D. thesis of E. Lancry in BIU.

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Authors and Affiliations

  1. Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel, 52900

    Elena Levi, Eli Lancry, Yossi Gofer & Doron Aurbach

Authors
  1. Elena Levi
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  2. Eli Lancry
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  3. Yossi Gofer
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  4. Doron Aurbach
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Correspondence to Elena Levi.

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Dedicated to Prof. Mikhail A. Vorotyntsev on the occasion of his 60th birthday.

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Levi, E., Lancry, E., Gofer, Y. et al. The crystal structure of the inorganic surface films formed on Mg and Li intercalation compounds and the electrode performance. J Solid State Electrochem 10, 176–184 (2006). https://doi.org/10.1007/s10008-005-0060-4

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  • DOI: https://doi.org/10.1007/s10008-005-0060-4

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