Tracking Non-Uniform Mesoscale Transport in LiFePO4 Agglomerates During Electrochemical Cycling

Johanna NelsonWeker, Yiyang Li, Rengarajan Shanmugam, Wei Lai, William C. Chueh

    Research output: Contribution to journalArticle

    • 8 Citations

    Abstract

    State-of-charge maps of a LiFePO4 electrode in standard nonaqueous electrolyte are recorded inoperando with a resolution of tens of nanometers by using hard X-ray spectroscopic microscopy. We observe spatially inhomogeneous charging and discharging of the composite electrode, with predominately Li-rich and Li-poor micron-scale agglomerates. There appears to be no correlation between the agglomerate size and the (de)lithiation pathway. Additionally, we observe that the electrochemical heterogeneity exhibits a "last to delithiate, first to lithiate" behavior, in which the regions that are the last to charge are also the regions that are the first to discharge. These observations suggest that the nanoscale pore structure within the agglomerates dominates lithium-ion transport.

    Original languageEnglish (US)
    Pages (from-to)1576-1581
    Number of pages6
    JournalChemElectroChem
    Volume2
    Issue number10
    DOIs
    StatePublished - Oct 1 2015

    Profile

    Electrodes
    Autoradiography
    Pore structure
    Microscopic examination
    Lithium
    Electrolytes
    X rays
    Composite materials
    Ions
    Parovarian Cyst
    Midodrine
    Biophysics
    Peroxidases
    Acromegaly

    Keywords

    • Electrochemistry
    • Lithiation
    • Nanoparticles
    • Transmission X-ray microscopy
    • X-ray absorption spectroscopy

    ASJC Scopus subject areas

    • Electrochemistry
    • Catalysis

    Cite this

    Tracking Non-Uniform Mesoscale Transport in LiFePO4 Agglomerates During Electrochemical Cycling. / NelsonWeker, Johanna; Li, Yiyang; Shanmugam, Rengarajan; Lai, Wei; Chueh, William C.

    In: ChemElectroChem, Vol. 2, No. 10, 01.10.2015, p. 1576-1581.

    Research output: Contribution to journalArticle

    NelsonWeker, J, Li, Y, Shanmugam, R, Lai, W & Chueh, WC 2015, 'Tracking Non-Uniform Mesoscale Transport in LiFePO4 Agglomerates During Electrochemical Cycling' ChemElectroChem, vol 2, no. 10, pp. 1576-1581. DOI: 10.1002/celc.201500119
    NelsonWeker J, Li Y, Shanmugam R, Lai W, Chueh WC. Tracking Non-Uniform Mesoscale Transport in LiFePO4 Agglomerates During Electrochemical Cycling. ChemElectroChem. 2015 Oct 1;2(10):1576-1581. Available from, DOI: 10.1002/celc.201500119

    NelsonWeker, Johanna; Li, Yiyang; Shanmugam, Rengarajan; Lai, Wei; Chueh, William C. / Tracking Non-Uniform Mesoscale Transport in LiFePO4 Agglomerates During Electrochemical Cycling.

    In: ChemElectroChem, Vol. 2, No. 10, 01.10.2015, p. 1576-1581.

    Research output: Contribution to journalArticle

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