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Local structure and electrochemistry of LiNi y Mn y Co1 − 2y O2 electrode materials for Li-ion batteries

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Abstract

A series of LiNi x Mn y Co z O2 (x = y, z = 1 − 2y) oxides have been synthesized by “chimie douce” and investigated as positive electrodes in rechargeable lithium batteries. Layered LiNi y Mn y Co1 − 2y O2 materials with high homogeneity and crystallinity were synthesized using the wet-chemical method assisted by carboxylic acid as the polymeric agent. The long range and local structural properties are investigated with experiments including X-ray diffraction, Fourier transform infrared spectroscopy, and electron paramagnetic resonance spectroscopy. The evolution of the structure is discussed as a function of the cobalt content that confers layer-like behavior on the framework. Electrochemical performance of LiNi y Mn y Co1 − 2y O2 oxides is tested in cells using nonaqueous 1 M LiPF6 dissolved in ethylene carbonate–diethyl carbonate. Charge–discharge profiles are investigated as a function of the rate capability and the voltage window. A relation is found between the gravimetric capacity and the cation disorder of the positive electrode as indicated by structural analysis. Fast lithium extraction attributed to the larger interslab space has been observed in the cobalt-rich oxides.

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Acknowledgments

The authors are grateful to M. Selmane for his assistance in the XRD measurements and Rietveld refinement. This work was partly supported by the OMHOTEP program (grant no. 12454NE).

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Authors and Affiliations

  1. Département de Chimie, Faculté des Sciences, Université Tunis-El Manar, 1060, Tunis, Tunisia

    K. Ben Kamel & N. Amdouni

  2. Institut des Nanosciences de Paris, UMR7588, Université Pierre et Marie Curie, Campus Boucicaut, 140 rue de Lourmel, 75015, Paris, France

    A. Abdel-Ghany, F. Gendron & C.M. Julien

  3. Institut de Recherche d’Hydro-Québec (IREQ), 1800 boul. Lionel-Boulet, Varennes, QC, J3X 1S1, Canada

    K. Zaghib

  4. Institut de Minéralogie et Physique de la Matière Condensée, UMR7590, Université Pierre et Marie Curie, 140 rue de Lourmel, 75015, Paris, France

    A. Mauger

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  1. K. Ben Kamel
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  2. N. Amdouni
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  3. A. Abdel-Ghany
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  4. K. Zaghib
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  5. A. Mauger
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  6. F. Gendron
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  7. C.M. Julien
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Correspondence to C.M. Julien.

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Kamel, K.B., Amdouni, N., Abdel-Ghany, A. et al. Local structure and electrochemistry of LiNi y Mn y Co1 − 2y O2 electrode materials for Li-ion batteries. Ionics 14, 89–97 (2008). https://doi.org/10.1007/s11581-007-0167-y

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  • DOI: https://doi.org/10.1007/s11581-007-0167-y

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