The distinct role of transition metal doping for LiFePO 4 cathode material

Sung Bin Park, Chang Kyoo Park, Jin Tae Hwang, Won Il Cho, Ho Jang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This study addresses the controversial issue of the effect of metal ion doping on the electrochemical performance of LiFePO 4. Metal doping is claimed to be a possible cause for the capacity improvement of LiFePO 4 as carbon coating. Results obtained inthis study show that dry-milled LiFePO 4 and LiFe 0.9Cr 0.1PO 4 deliver 119 mAh g -1 and 101 mAh g -1 , while wet-milled LiFePO 4 and LiFe 0.9Cr 0.1PO 4 deliver 149 mAh g -1 and 138 mAh g -1 , respectively. This indicates that the capacity improvement by metal doping is due to the carbonaceous materials produced during fabrication and not by the enhancement of ion diffusion. On the other hand, cycle test results show that metal doping enhances the rate capability at high C-rates by accelerating lithium ion diffusion.

Original languageEnglish
Pages (from-to)729-732
Number of pages4
JournalMetals and Materials International
Volume17
Issue number5
DOIs
Publication statusPublished - 2011 Oct

Keywords

  • Diffusion
  • Electrical conductivity
  • Electrochemistry
  • Energy storage materials
  • Mechanical milling

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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