The use of Raman and XPS spectroscopy to study the cathode material of LiFePO4/C

Vadym Galaguz, Oleksandr Korduban, Eduard Panov, Sergiy Malovanyi

Abstract


Using Raman spectroscopy and X-ray photoelection spectroscopy (XPS), synthesized lithium iron(II) phosphate (LiFePO4) and carbon coated nanocomposites LiFePO4/С, synthesized by annealing LiFePO4 with glucose for 1 and 12 hours at 700 °C, have been investigated. According to XPS data, the synthesis conditions of LiFePO4/С nanocomposite (700 °C, 1 hour) facilitate the reduction of iron, Fe3+ → Fe2+, on the sample surface. Also according to C1s spectra, sp2C-sp2C is the main bond type in the samples under investigation. Contributions relating to C-O, C=O, C-O-C, O-C=O functional groups are also present. According to X-ray diffraction analysis, a 12-hour synthesis of LiFePO4/C nanocomposite leads to the formation of impurities. According to Raman spectra, the annealing time does not affect the quality of carbon coating: the peak intensity ratio of bands D and G has a value of 1.06 for the material annealed for 1 hour and 1.04 for LiFePO4/С nanocomposite after annealing for 12 hours.


Keywords


battery cathodes; functional groups; Li-ion

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DOI: https://doi.org/10.2298/JSC190910011G

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