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

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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.

LanguageEnglish (US)
Pages1576-1581
Number of pages6
JournalChemElectroChem
Volume2
Issue number10
DOIs
StatePublished - Oct 1 2015

Profile

Electrodes
Pore structure
Lithium
Electrolytes
Microscopic examination
Ions
X rays
Composite materials

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. 2015 ; Vol. 2, No. 10. pp. 1576-1581
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