2006
DOI: 10.1149/1.2128766
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Synthesis and Characterization of LiFePO[sub 4] and LiTi[sub 0.01]Fe[sub 0.99]PO[sub 4] Cathode Materials

Abstract: Nanocrystalline LiFePO 4 and doped LiTi 0.01 Fe 0.99 PO 4 powders were synthesized via a sol-gel preparation route. High-resolution tunneling electron microscopy observation and energy dispersive spectroscopy, mapping show the homogeneous distribution of dopant Ti cations in the crystals. Fe and O K-edge X-ray absorption near-edge structure ͑XANES͒ measurements show that Ti 4+ doping induces an increased unoccupied d-state in LiFePO 4 , resulting in an enhanced p-type semiconductivity. In situ Fe K-edge XANES … Show more

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Cited by 109 publications
(62 citation statements)
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“…The crystal structure of the triphylite LiFePO 4 has been well studied and documented in the literature [7][8][9][10][11][12][13][14][15]. The pure LiFePO 4 belongs to the olivine of lithium ortho-phosphates with an orthorhombic lattice structure in the space group Pnmb.…”
Section: Crystal Structural Analysis Lifepo 4 Nanostructuresmentioning
confidence: 99%
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“…The crystal structure of the triphylite LiFePO 4 has been well studied and documented in the literature [7][8][9][10][11][12][13][14][15]. The pure LiFePO 4 belongs to the olivine of lithium ortho-phosphates with an orthorhombic lattice structure in the space group Pnmb.…”
Section: Crystal Structural Analysis Lifepo 4 Nanostructuresmentioning
confidence: 99%
“…Other efforts to improve the electronic conductivity includes the addition of dispersed metal powders, doping with several elements and coating with conductive polymers [8][9][10][11]. In addition to above conductive coating development, in recent years the efforts to overcome the inherent deficiency of LiMPO 4 materials have been focused on reducing the particle size to nanometer scale [12][13][14][15]. Some reports indicate that Li + diffusion capability may become a controlling step, when the electronic conductivity of the olivine phosphate such as LiFePO 4 is optimized [4].…”
mentioning
confidence: 99%
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“…However, the resuls have shown improvements on bulk conductivity without changes on any LiFePO 4 [18]. In addition, investigations of doping of other heteroatoms indicate that the electrochemical properties of LiFePO4 could be improved by this modification [19][20][21][22][23].…”
Section: Introductionmentioning
confidence: 98%
“…Although several reports have been published on vanadium [6][7][8][9][10][11][12] and titanium [13][14][15][16] substitution, there is much disagreement regarding the formation of the LiFe 1-y V y PO 4 and LiFe 1-y Ti y PO 4 solid solutions. Some authors insist that V 3+ substitutes for Fe 2+ on Fe sites within the solid solubility limit 0<x<0.08 [9] or at x<0.1 [7].…”
Section: Introductionmentioning
confidence: 99%