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Synthesis, characterization and electrochemical properties of a novel triphosphate LiFe2P3O10

Abstract : A novel lithium iron phosphate has been synthesized by a solution route at moderate temperature. The structure was determined from powder by XRD, HRTEM and SAED experiments. LiFe2P3O10 tripolyphosphate crystallizes in the monoclinic system, space group P21/m, with lattice constants a = 4.597(7) Å, b = 8.566(4) Å, c = 9.051(4) Å, ˇ=97.47◦ and Z = 2. Internal and external vibrational modes (Raman and FTIR) show that the dominant spectral features come from the (P3O10)5− oxo-anions displaying internal and external modes along with the P–O–P bridging modes. Magnetic measurements are consistent with the high-spin configuration of Fe2+ cation with an effective magnetic moment 5.51B. A weak antiferromagnetic ordering is observed belowthe Néel temperature at TN = 19K. Electron paramagnetic resonance spectroscopy confirms this electronic configuration and provides evidence of the presence of a carbonaceous layer onto the particle surface. Electrochemical measurements were carried out in lithium cells with LiPF6–EC–DEC electrolyte at 25 ◦C. The material delivered a capacity 70 mAh/g in the voltage range 2.7–3.9 V, close to the theoretical value (72 mAh/g). The resulting cyclic voltammogram indicates a stable structure with a good reversibility with the redox peaks at 3.26 and 3.13V vs. Li0/Li+.
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Submitted on : Friday, October 2, 2009 - 10:38:17 AM
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M. Kopec, C.V. Ramana, X. Zhang, A. Mauger, F. Gendron, et al.. Synthesis, characterization and electrochemical properties of a novel triphosphate LiFe2P3O10. Electrochimica Acta, Elsevier, 2009, 54, pp.5500-5508. ⟨10.1016/j.electacta.2009.04.050⟩. ⟨hal-00421528⟩



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