4.5 Letter

In situ Raman spectroscopy of single microparticle Li+-intercalation electrodes

Journal

JOURNAL OF PHYSICAL CHEMISTRY B
Volume 107, Issue 46, Pages 12549-12554

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jp034977c

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Modifications in the vibrational properties of a single microparticle of LiMn2O4 induced by extraction and subsequent injection of Li+ into the lattice have been monitored in situ via simultaneous acquisition of Raman scattering spectra and cyclic voltammetry data in 1 M LiClO4 solutions in ethylene carbonate (EC):diethyl carbonate (DEC) mixtures (1:1 by volume). Statistical analyses of the spectra in the range 15 < SOD < 45%, where SOD represents the state of discharge (in percent) of the nominally fully charged material, i.e., lambda-MnO2, were found to be consistent with the coexistence of two distinct phases of lithiated metal oxide in agreement with information derived from in situ X-ray diffraction (XRD) measurements involving more conventional battery-type electrodes

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