Rate performance and structural change of Cr-doped LiFePO4/C during cycling

Ho Chul Shin, Sung Bin Park, Ho Jang, Kyung Yoon Chung, Won Il Cho, Chang Sam Kim, Byung Won Cho

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

Structural change of Cr-doped LiFePO4/C during cycling is investigated using conventional and synchrotron-based in situ X-ray diffraction techniques. The carbon-coated and Cr-doped LiFePO4 particles are synthesized by a mechanochemical process followed by a one-step heat treatment. The LiFe0.97Cr0.03PO4/C has shown excellent rate performance, delivering the discharge capacity up to 120 mAh/g at 10 C rate. The results suggest that the improvement of the rate performance is attributed to the chromium doping, which facilitates the phase transformation between triphylite and heterosite during cycling, and conductivity improvement by carbon coating. Structural analysis using the synchrotron source also indicates that the doped Cr replaces Fe and/or Li sites in LiFePO4.

Original languageEnglish
Pages (from-to)7946-7951
Number of pages6
JournalElectrochimica Acta
Volume53
Issue number27
DOIs
Publication statusPublished - 2008 Nov 15

Keywords

  • Carbon coating
  • Doping
  • In situ X-ray diffraction
  • LiFePO
  • Lithium batteries

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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    Shin, H. C., Park, S. B., Jang, H., Chung, K. Y., Cho, W. I., Kim, C. S., & Cho, B. W. (2008). Rate performance and structural change of Cr-doped LiFePO4/C during cycling. Electrochimica Acta, 53(27), 7946-7951. https://doi.org/10.1016/j.electacta.2008.06.005