Determination of the chemical diffusion coefficient of lithium in LiFePO

Pier Paolo Prosini, Marida Lisi, Daniela Zane, Mauro Pasquali

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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.
Original languageEnglish
Pages (from-to)45 - 51
Number of pages7
JournalSolid State Ionics
Volume148
Issue number1-2
DOIs
Publication statusPublished - 1 May 2002

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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