Synthesis and performance study of cobalt-substituted lithium iron phosphate

Sundaramurthy, Anandhakumar; Sundar, M.; Selvasekarapandian, S.

doi:10.1007/s11581-006-0060-0

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…10,11 The combination of Fe and Co in the crystal structure of olivine-like metallophosphates was also explored by several groups. [12][13][14][15][16][17] At high cobalt contents, the operation in the voltage range corresponding to the Co 3+ /Co 2+ electrochemical reaction (4.8 V vs. Li/Li + ) is accompanied by the fast capacity fading of the cell, which was ascribed to the oxidative electrolyte degradation. 12 The problem of the anodic stability of the electrolyte should be even more serious for LiNi y Co 1Ày PO 4 cathode materials, 18,19 because of the higher oxidation potential of Ni 3+ /Ni 2+ (45 V vs. Li/Li + ).…”

Section: Introductionmentioning

confidence: 99%

Mixed LiCo0.6M0.4PO4 (M = Mn, Fe, Ni) phosphates: cycling mechanism and thermal stability

Bramnik

Trots²,

Hofmann

et al. 2009

Phys. Chem. Chem. Phys.

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Editorial 8 (y = 1, 2, 3, 4, 4.5) The electrochemical delithiation of LiCo 0.6 M 0.4 PO 4 phosphates (M = Mn, Fe, Ni) was studied by in situ synchrotron diffraction. In all three metallophosphates the oxidation-reduction of 3d-elements proceed via two-phase mechanisms leading to two-phase regions, corresponding to the Co 2+ /Co 3+ and M 2+ /M 3+ reactions. The Ni 2+ /Ni 3+ reaction was not revealed, neither by the potentiostatic intermittent titration technique (PITT) nor by diffraction. In the two-phase reaction, the olivine-like structure of the cathode remains preserved, which is characteristic of this type of materials. Pronounced solid-solution domains were observed during both lithium extraction and insertion. The thermal stability of the charged cathodes is limited by the presence of Co 3+ and its intrinsic instability in these compounds.

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Section: Introductionmentioning

confidence: 99%

Mixed LiCo0.6M0.4PO4 (M = Mn, Fe, Ni) phosphates: cycling mechanism and thermal stability

Bramnik

Trots²,

Hofmann

et al. 2009

Phys. Chem. Chem. Phys.

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“…27 New methods have also arisen to produce mainly LiFePO 4 /C composites, such as combustion, microwave heating, and polyol. [28][29][30][31] One of the newest synthesis methods recently applied to LiFePO 4 /C composites production is freeze-drying. Previous results published by our group demonstrated that this procedure is able to generate nano-sized composites with a remarkable electrochemical performance.…”

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confidence: 99%

Influence of Carbon Content on LiFePO[sub 4]/C Samples Synthesized by Freeze-Drying Process

Palomares

Goñi

Meatza

et al. 2009

J. Electrochem. Soc.

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The influence of the carbon content in LiFePO4/C composites synthesized by the freeze-drying method was studied by varying the citric acid (chelating agent): Fe ratio. Diminishing this ratio from 1:1 to 0.33:1 led to a gradual reduction of the carbon content from 16.1 to 7.2% wt and different morphologies. Transmission electron microscopy micrographs of the composite with the greatest carbon percentage (16%) show mainly 30 nm LiFePO4 particles homogeneously embedded in a carbon network. Samples containing less carbon exhibit only one type of morphology, 200–700 nm aggregates made up of an intimate mixture of LiFePO4 particles and carbon. Galvanostatic cycling from 2 to 4 V vs Li/Li+ evidences the typical LiFePO4 redox behavior at 3.4 V, and a second contribution at 2.65 V probably related to the carbon content. At a high rate, a good specific capacity value is observed for the nanoparticulate sample (16% wt C), whereas poorer performance is observed for low carbon content samples (11 and 7.2 wt % C). Heterogeneous and insufficient carbon covering together with phosphate particle aggregation in these latter samples can account for this behavior. Two carbon distribution models are proposed to explain different electrochemical responses. In all cases, a good capacity retention is observed after prolonged cycling.

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Growth of FePO4 nanoparticles on graphene oxide sheets for synthesis of LiFePO4/graphene

Li¹,

Zhou²,

Liu³

et al. 2016

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Synthesis and performance study of cobalt-substituted lithium iron phosphate

Cited by 5 publications

References 21 publications

Mixed LiCo0.6M0.4PO4 (M = Mn, Fe, Ni) phosphates: cycling mechanism and thermal stability

Mixed LiCo0.6M0.4PO4 (M = Mn, Fe, Ni) phosphates: cycling mechanism and thermal stability

Influence of Carbon Content on LiFePO[sub 4]/C Samples Synthesized by Freeze-Drying Process

Growth of FePO4 nanoparticles on graphene oxide sheets for synthesis of LiFePO4/graphene

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