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

• Main Authors: Galaguz Vadym, Korduban Oleksandr, Panov Eduard, Malovanyi Sergiy
• Format: Article
• Language: English
• Published: Serbian Chemical Society 2020-01-01
• Series: Journal of the Serbian Chemical Society
• Subjects: battery cathodes; functional groups; li-ion
• Online Access: http://www.doiserbia.nb.rs/img/doi/0352-5139/2020/0352-51392000011G.pdf
• ISSN: 0352-5139; 1820-7421

Using Raman spectroscopy and X-ray photoelection spectroscopy, synthesized lithium iron(II) phosphate (LiFePO4) and carbon coated nanocomposites LiFePO4/С, synthesized by annealing LiFePO4 with glucose for 1 and 12 h at 700°C, have been investigated. According to XPS data, the synthesis conditions of LiFePO4/С nanocomposite (700°C, 1 h) 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-h 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 h and 1.04 for LiFePO4/С nanocomposite after annealing for 12 h.