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Local structure of manganese oxides and lithium intercalates

Abstract : The aim of this work is to determine the vibrational properties of manganese oxide frameworks and their lithium intercalates used as positive electrode material in Li-ion batteries. Raman and FTIR spectroscopies yield reliable description of material structure in which distortion of the basal MnO6 octahedra may be expected. Lattice dynamics are studied using either a classical group theoretical analysis or a local environment model. The local arrangement in MnO2 structures is investigated for pyrolusite, ramsdellite and the Li0.33MnO2 phase. The phase evolution as a function of the degree of lithium intercalation or deintercalation is reported and analysed in series of manganospinels Li1–x+δMn2–δO4 with 0≤x≤1 and 0≤δ≤0.33. The trigonal distortion of MnO6 octahedra is evidenced by insertion of lithium ions into the [B2]O4 spinel framework. A comparison with tetragonal Li2Mn2O4 and Li6.5Mn5O12 spinels shows the influence of the Jahn-Teller effect on the Raman features for this class of materials. The local structure was characterized as a function of the mean oxidation state of manganese cations.
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https://hal.archives-ouvertes.fr/hal-00017242
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Submitted on : Wednesday, January 18, 2006 - 11:06:59 AM
Last modification on : Saturday, January 15, 2022 - 3:44:34 AM

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Christian Julien, M. Massot. Local structure of manganese oxides and lithium intercalates. Ionics, Springer Verlag, 2005, 11 (3-4), pp.226. ⟨10.1007/BF02430381⟩. ⟨hal-00017242⟩

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