• Panov, Eduard
• Malovanyi, Sergiy
• Galaguz, Vadym
• Korduban, Oleksandr

Abstract

<jats:p>Using Raman spectroscopy and X-ray photoelection spectroscopy, synthesized lithium iron(II) phosphate (LiFePO4) and carbon coated nanocomposites LiFePO4/?, 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/? 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/? nanocomposite after annealing for 12 h.</jats:p>

Topics

• nanocomposite
• impedance spectroscopy
• surface
• Carbon
• x-ray diffraction
• x-ray photoelectron spectroscopy
• Lithium
• iron
• annealing
• Raman spectroscopy