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Mauro Pasquali - One of the best experts on this subject based on the ideXlab platform.

  • determination of the chemical Diffusion Coefficient of lithium in lifepo4
    Solid State Ionics, 2002
    Co-Authors: Marida Lisi, Daniela Zane, Pier Paolo Prosini, Mauro Pasquali
    Abstract:

    Abstract The lithium insertion in the ordered olivine-type structure of LiFePO 4 was analyzed as an insertion process with a Frumkin-type sorption isotherm. A minimum in the chemical Diffusion Coefficient of lithium ( D Li ) was predicted by the model for strong attractive interactions between the intercalation species and the host matrix. The D Li in the material was measured as a function of the lithium content by using the galvanostatic intermittent titration technique (GITT). The Diffusion Coefficient was found 1.8×10 −14 and 2.2×10 −16 cm 2 s −1 for LiFePO 4 and FePO 4 , respectively, with a minimum in correspondence of the peak of the differential capacity. The D Li has also been measured by AC impedance method for various lithium contents. The calculated values are in very good agreement with the previous calculated ones.

  • Determination of the chemical Diffusion Coefficient of lithium in LiFePO4
    Solid State Ionics, 2002
    Co-Authors: Pier Paolo Prosini, Marida Lisi, Daniela Zane, Mauro Pasquali
    Abstract:

    The lithium insertion in the ordered olivine-type structure of LiFePO4was analyzed as an insertion process with a Frumkin-type sorption isotherm. A minimum in the chemical Diffusion Coefficient of lithium (DLi) was predicted by the model for strong attractive interactions between the intercalation species and the host matrix. The DLiin the material was measured as a function of the lithium content by using the galvanostatic intermittent titration technique (GITT). The Diffusion Coefficient was found 1.8×10-14and 2.2×10-16cm2s-1for LiFePO4and FePO4, respectively, with a minimum in correspondence of the peak of the differential capacity. The DLihas also been measured by AC impedance method for various lithium contents. The calculated values are in very good agreement with the previous calculated ones. © 2002 Elsevier Science B.V. All rights reserved.

Pier Paolo Prosini - One of the best experts on this subject based on the ideXlab platform.

  • determination of the chemical Diffusion Coefficient of lithium in lifepo4
    Solid State Ionics, 2002
    Co-Authors: Marida Lisi, Daniela Zane, Pier Paolo Prosini, Mauro Pasquali
    Abstract:

    Abstract The lithium insertion in the ordered olivine-type structure of LiFePO 4 was analyzed as an insertion process with a Frumkin-type sorption isotherm. A minimum in the chemical Diffusion Coefficient of lithium ( D Li ) was predicted by the model for strong attractive interactions between the intercalation species and the host matrix. The D Li in the material was measured as a function of the lithium content by using the galvanostatic intermittent titration technique (GITT). The Diffusion Coefficient was found 1.8×10 −14 and 2.2×10 −16 cm 2 s −1 for LiFePO 4 and FePO 4 , respectively, with a minimum in correspondence of the peak of the differential capacity. The D Li has also been measured by AC impedance method for various lithium contents. The calculated values are in very good agreement with the previous calculated ones.

  • Determination of the chemical Diffusion Coefficient of lithium in LiFePO4
    Solid State Ionics, 2002
    Co-Authors: Pier Paolo Prosini, Marida Lisi, Daniela Zane, Mauro Pasquali
    Abstract:

    The lithium insertion in the ordered olivine-type structure of LiFePO4was analyzed as an insertion process with a Frumkin-type sorption isotherm. A minimum in the chemical Diffusion Coefficient of lithium (DLi) was predicted by the model for strong attractive interactions between the intercalation species and the host matrix. The DLiin the material was measured as a function of the lithium content by using the galvanostatic intermittent titration technique (GITT). The Diffusion Coefficient was found 1.8×10-14and 2.2×10-16cm2s-1for LiFePO4and FePO4, respectively, with a minimum in correspondence of the peak of the differential capacity. The DLihas also been measured by AC impedance method for various lithium contents. The calculated values are in very good agreement with the previous calculated ones. © 2002 Elsevier Science B.V. All rights reserved.

J. P. Loup - One of the best experts on this subject based on the ideXlab platform.

Ralph E White - One of the best experts on this subject based on the ideXlab platform.

  • oxygen Diffusion Coefficient and solubility in a new proton exchange membrane
    Journal of The Electrochemical Society, 2000
    Co-Authors: Andrew T Haug, Ralph E White
    Abstract:

    The electrochemical monitoring technique is used to measure the solubility and the Diffusion Coefficient of oxygen in a new proton exchange membrane that is being developed by Cape Cod Research, Inc., Using the method of least squares, the data were fit to an analytical solution of Fick's second law to determine D and c{sub 0}. Values of 0.40 x 10{sup {minus}6}cm{sup 2}/s and 4.98 x 10{sup {minus}6} mol/cm{sup 3} were obtained for the Diffusion Coefficient and solubility, respectively, of the Cape Cod membrane. These values are significantly less than those of Nafion 117 tested under identical conditions.

Fabrice Mauvy - One of the best experts on this subject based on the ideXlab platform.