The root cause of the rate performance improvement after metal doping: A case study of LiFePO4

Chang Kyoo Park, Sung Bin Park, Ji Hun Park, Ho Chul Shin, Won Il Cho, Ho Jang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study investigates a root cause of the improved rate performance of LiFePO4 after metal doping to Fesites. This is because the metal doped LiFePO4/C maintains its initial capacity at higher C-rates than undoped one. Using LiFePO4/C and doped LiFe0.97M 0.03PO4/C (M=Al3+, Cr3+, Zr 4+), which are synthesized by a mechanochemical process followed by one-step heat treatment, the Li content before and after chemical delithiation in the LiFePO4/C and the binding energy are compared using atomic absorption spectroscopy (AAS) and X-ray photoelectron spectroscopy (XPS). The results from AAS and XPS indicate that the low Li content of the metal doped LiFePO4/C after chemical delithiation is attributed to the low binding energy induced by weak Li-O interactions. The improved capacity retention of the doped LiFePO4/C at high discharge rates is, therefore, achieved by relatively low binding energy between Li and O ions, which leads to fast Li diffusivity.

Original languageEnglish
Pages (from-to)921-926
Number of pages6
JournalBulletin of the Korean Chemical Society
Volume32
Issue number3
DOIs
Publication statusPublished - 2011 Mar 20

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Metals
Doping (additives)
Binding energy
Atomic spectroscopy
Absorption spectroscopy
X ray photoelectron spectroscopy
LiFePO4
Heat treatment
Ions

Keywords

  • Binding energy
  • Doping
  • LiFePO
  • Rate performance
  • XPS

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

The root cause of the rate performance improvement after metal doping : A case study of LiFePO4. / Park, Chang Kyoo; Park, Sung Bin; Park, Ji Hun; Shin, Ho Chul; Cho, Won Il; Jang, Ho.

In: Bulletin of the Korean Chemical Society, Vol. 32, No. 3, 20.03.2011, p. 921-926.

Research output: Contribution to journalArticle

Park, Chang Kyoo ; Park, Sung Bin ; Park, Ji Hun ; Shin, Ho Chul ; Cho, Won Il ; Jang, Ho. / The root cause of the rate performance improvement after metal doping : A case study of LiFePO4. In: Bulletin of the Korean Chemical Society. 2011 ; Vol. 32, No. 3. pp. 921-926.
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