Spectroscopic and Chemical Imaging Analysis of Lithium Iron Triphosphate
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- 作者：C. V. Ramana ; A. Ait-Salah ; S. Utsunomiya ; J.-F. Morhange ; A. Mauger ; F. Gendron ; C. M. Julien
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：January 18, 2007
- 年：2007
- 卷：111
- 期：2
- 页码：1049 - 1054
- 全文大小：230K
- 年卷期：v.111,no.2(January 18, 2007)
- ISSN：1932-7455
文摘
A novel material, namely, Fe-containing lithium-metal triphosphate (LiM2P3O10; M=Fe), has been synthesizedby wet-chemical method. The phase shows the monoclinic structure (P21/m
C22h). The crystal chemistryand chemical structural characteristics have been analyzed by X-ray-diffraction (XRD), energy-dispersiveX-ray spectroscopy (EDS), and high-angle annular dark field scanning transmission electron microscopy(HAADF-STEM). Surface chemical composition, valence state, and chemical bonding and local structureanalysis have been performed by X-ray photoelectron (XPS) and Raman scattering (RS) spectroscopy. EDSand HAADF-STEM indicate the chemical homogeneity and purity of LiFe2P3O10 samples. Both XPS and RSexperiments show the existence of an amorphous carbon deposit at the surface of the LiFe2P3O10 particles.Comparison between XPS results for LiFePO4 olivine and LiFe2P3O10 revealed the change in the bindingenergy of Fe(II) ions. Studies of the local structure characterized by Raman scattering show the evolution ofthe chemical bonding with the increased number of interconnected PO4 oxo-anionic groups. The electrochemicalcharacteristics of LiFe2P3O10 demonstrate their applicability in lithium batteries.
C22h). The crystal chemistryand chemical structural characteristics have been analyzed by X-ray-diffraction (XRD), energy-dispersiveX-ray spectroscopy (EDS), and high-angle annular dark field scanning transmission electron microscopy(HAADF-STEM). Surface chemical composition, valence state, and chemical bonding and local structureanalysis have been performed by X-ray photoelectron (XPS) and Raman scattering (RS) spectroscopy. EDSand HAADF-STEM indicate the chemical homogeneity and purity of LiFe2P3O10 samples. Both XPS and RSexperiments show the existence of an amorphous carbon deposit at the surface of the LiFe2P3O10 particles.Comparison between XPS results for LiFePO4 olivine and LiFe2P3O10 revealed the change in the bindingenergy of Fe(II) ions. Studies of the local structure characterized by Raman scattering show the evolution ofthe chemical bonding with the increased number of interconnected PO4 oxo-anionic groups. The electrochemicalcharacteristics of LiFe2P3O10 demonstrate their applicability in lithium batteries.