Synthesis of tetrahedral LiFeO2 and its behavior as a cathode in rechargeable lithium batteries

A. Robert Armstrong, Daniel W. Tee, Fabio La Mantia, Petr Novak, Peter G. Bruce

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)

Abstract

Synthesis and structural characterization of the first LiFeO2 compound with tetrahedrally coordinated Fe3+ is reported. When used as a positive intercalation electrode in a lithium cell, it can store charge of up to 120 mAhg(-1) at a rate of 100 mAg(-1). However, it converts to the defect spinel LiFe5O8 on cycling. By combining results from powder X-ray diffraction, differential electrochemical mass spectrometry, electrochemical cycling, and TG-MS, it is shown that such conversion, which involved oxygen loss, is not associated with direct O-2 gas evolution but instead reaction with the electrolyte. We suggest that intercalation/ deintercalation is accompanied by the exchange of Li+ by H+ in the material and subsequent loss of H2O, thus converting LiFeO2 to the defect spinel LiFe5O8 on cycling.

Original languageEnglish
Pages (from-to)3554-3559
Number of pages6
JournalJournal of the American Chemical Society
Volume130
DOIs
Publication statusPublished - 19 Mar 2008

Keywords

  • ION BATTERIES
  • ELECTROCHEMICAL PROPERTIES
  • SECONDARY BATTERIES
  • MANGANESE-OXIDE
  • IRON-OXIDES
  • LI
  • ELECTROLYTE
  • PERFORMANCE
  • PHOSPHATES
  • MECHANISM

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