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• W1997583588 abstract "We have performed Mn K-edge X-ray Absorption and Mn L-edge emission spectroscopies on LiMn2O4, its chemically delithiated and lithiated derivatives (λ-MnO2 and Li2Mn2O4, respectively), and two Mn3+ spinel model compounds. These experiments were undertaken to understand the associated changes in atomic and electronic structure occurring when LiMn2O4 is used in a rechargeable lithium cell. Subtle changes in the Mn K-edge X-ray absorption near edge structure (XANES) occur upon delithiation that are consistent with literature reports of the oxidation of Mn3+ to Mn4+, retention of the cubic phase, and contraction of the spinel lattice. Conversely, when LiMn2O4 is lithiated, the XANES changes dramatically due to the concurrent transformation from a cubic to a tetragonal spinel. The spectrum is different from XANES of tetragonal Mn3+ spinels possessing approximately the same degree of tetragonal distortion as Li2Mn2O4. This spectral difference is attributed to the inserted Li+ imparting an increased degree of covalency within the Li2Mn2O4 structure resulting in a 1s → 4p + LMCT (ligand to metal charge transfer) shakedown. This increase in covalency was confirmed through Mn L-edge X-ray Emission Spectroscopy measurements. The increased degree of covalency provides insight into the lower Li+ diffusion coefficients reported in the literature and the electronic conduction mechanism for LixMn2O4 when x > 1." @default.
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• W1997583588 date "2000-09-23" @default.
• W1997583588 modified "2023-10-03" @default.
• W1997583588 title "Electronic Structure of Chemically-Prepared Li<i>_x</i>Mn₂O₄ Determined by Mn X-ray Absorption and Emission Spectroscopies" @default.
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• W1997583588 doi "https://doi.org/10.1021/jp994475s" @default.
• W1997583588 hasPublicationYear "2000" @default.
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