Cation ordering in the layered Li1+x(Ni0.425Mn0.425Co0.15)1 − xO2 materials (x = 0 and 0.12) |
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Authors: | F Weill N Tran L Croguennec C Delmas |
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Affiliation: | 1. ICMCB, CNRS, Université Bordeaux 1 Site ENSCPB, 87 avenue Schweitzer, 33608 Pessac cedex, France;2. Centre de Ressources en Microscopie Electronique et Microanalyse, Université Bordeaux I, 351 cours de la Libération, 33405 Talence, France |
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Abstract: | The layered Li1+x(Ni0.425Mn0.425Co0.15)1 − xO2 (x = 0 and 0.12) materials were prepared by a coprecipitation method. Their structure was investigated using the combination of X-ray and electron diffraction experiments. For both materials (x = 0 and 0.12), the electron diffraction patterns revealed an in-plane √3ahex. × √3ahex. superstructure in agreement with the ordering of the Li+, Ni2+, Ni3+, Mn4+ and Co3+ ions in the transition metal layers. The stoichiometry of these materials was not in agreement with an ideal ordering: the possible presence of point defects or of a domain microstructure was thus discussed. Electron diffraction also revealed that these ordered layers were slightly correlated along the chex. axis for both materials. |
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Keywords: | Layered oxides Overlithiation Cation mixing X-ray diffraction Electron diffraction Lithium-ion battery |
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