Asymmetry between charge and discharge during high rate cycling in LiFePO4 - In Situ X-ray diffraction study

Ho Chul Shin, Kyung Yoon Chung, Won Sik Min, Dong Jin Byun, Ho Jang, Byung Won Cho

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Asymmetric behavior of structural changes during charge and discharge of C-coated LiFePO4 has been investigated using synchrotron based in situ XRD. C-coated LiFePO4 undergoes phase transformation from triphylite to heterosite during charge and vise versa during discharge. However, it is observed that the phase transformation of C-coated Li1-xFePO4 during discharge is more difficult to be complete than that during charge. At 2C rate, the phase transformation from heterosite to triphylite was hardly observed during discharge while the complete phase transformation was observed in the previous charge. This indicates that the degree of the phase transformation completeness depends on the direction of the phase transformations.

Original languageEnglish
Pages (from-to)536-540
Number of pages5
JournalElectrochemistry Communications
Volume10
Issue number4
DOIs
Publication statusPublished - 2008 Apr 1

Keywords

  • Asymmetry
  • In situ X-ray diffraction
  • LiFePO
  • Lithium secondary batteries

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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