Structure peculiarities of carbon-coated lithium titanate: Raman spectroscopy and electron microscopic study

Li4Ti4.92(CrV)0.04O12/C composites were synthesized at 800 °C under a flow of argon/acetylene gas mixture taken in the 40:1volumetric ratio. X-ray diffraction (XRD), thermogravimetric analysis (TGA), magnetic susceptibility, Raman spectroscopy, and electron microscopy (TEM) were used to characterize the phase structure, composition, and morphology of the composites. Transmission electron microscopy and Raman spectroscopy confirmed that carbon exists on the surface of the spinel matrix. The composites proved to have a modified structure in comparison with the pristine spinel phase.

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► Li4Ti5O12/C composites were synthesized under a flow of argon/acetylene.
► The carbonization proved to lead to modification of the matrix spinel structure.
► Structure of the modified phase is considered as an ordered NaCl one.
► Raman spectra give evidence of lithium ions redistribution.