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Article Dans Une Revue Journal of Power Sources Année : 2014

In operando X-ray diffraction study of Li7MnN4 upon electrochemical Li extraction-insertion: A reversible three-phase mechanism

Résumé

The Li7MnN4 structural response upon the first Li extraction insertion cycle is highlighted using in operando XRD experiments. A 3-phases mechanism involving two biphasic regions for 0.1 less than or similar to x less than or similar to 0.8 and 0.8 less than or similar to x less than or similar to 1.2 in Li7-xMnN4 and a solid solution behaviour (1.2 less than or similar to x less than or similar to 1.5) explains its electrochemical fingerprint. These successive structural transitions do not change the cubic symmetry of the cell and induce a limited cell contraction (similar to 7%) associated to a reversible mechanical strain. This finding partly explains the excellent cycle life of this promising negative electrode for Li-ion batteries. (C) 2013 Elsevier B.V. All rights reserved.
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hal-00988070 , version 1 (07-05-2014)

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N. Emery, E. Panabiere, Olivier Crosnier, S. Bach, Thierry Brousse, et al.. In operando X-ray diffraction study of Li7MnN4 upon electrochemical Li extraction-insertion: A reversible three-phase mechanism. Journal of Power Sources, 2014, 247, pp.402. ⟨10.1016/j.jpowsour.2013.08.008⟩. ⟨hal-00988070⟩
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