Relocation of cobalt ions in electrochemically delithiated LiCoPO 4 cathode materials

Quang Duc Truong, Murukanahally Kempaiah Devaraju, Yoshikazu Sasaki, Hiroshi Hyodo, Takaaki Tomai, Itaru Honma

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The point defects in crystal lattices including antisite cation exchange, dopants, and atomic vacancies have been the topic of extraordinary research interest in solid state physics and chemistry. The ordered olivine structure was maintained after delithiation as indicated in high-resolution TEM images and selected-area electron diffraction (SAED) patterns. The increased degree of defect suggests that the cobalt metal ions have diffused and occupied vacancies created by Li extraction during the delithiation process. The extraction of Li ions from the lattice promotes the relocation of Co ion from M2 sites to the vacancy M1 sites. The vacancies created by Co ions migration appear to be locally segregated in the channel. The relocation resulted in the large capacity loss (low coulomb efficiency) in the initial discharge process.

Original languageEnglish
Pages (from-to)2770-2773
Number of pages4
JournalChemistry of Materials
Volume26
Issue number9
DOIs
Publication statusPublished - 2014 May 13

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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