Novel lithium iron pyrophosphate (LiFe 1.5P 2O 7) as a positive electrode for Li-ion batteries

C. V. Ramana, A. Ait-Salah, Satoshi Utsunomiya, A. Mauger, F. Gendron, C. M. Julien

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Abstract

Lithium iron pyrophosphate (LiFe 1.5P 2O 7) has been synthesized by a wet-chemical method for application in lithium-ion batteries. Structural analysis using X-ray diffraction and high-resolution electron microscopy indicate that LiFe 1.5O 7 synthesized at 500°C, using metal acetates, is crystallized in the monoclinic structure with lattice parameters a = 0.698 76 nm, b = 0.812 36 nm, c = 0.964 22 nm, and β=111.83° (P2 1/c space group). Electrochemical characterization of LiFe 1.5O 7 in lithium cells indicates a capacity of 95 mA·h/g obtained in the voltage range 2.5-4.2 V. The resulting incremental capacity indicates a stable structure for the first cycle with the redox peaks at 3.33 and 3.22 V versus Li 0/Li +. The capacity of LiFe 1.5P 2O 7 decreased with cycling number at the rate of 0.22% per cycle while the capacity falls off rapidly in the case of material prepared at higher temperatures.

Original languageEnglish
Pages (from-to)5319-5324
Number of pages6
JournalChemistry of Materials
Volume19
Issue number22
DOIs
Publication statusPublished - Oct 30 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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