Structural analysis and electrochemical performance of Li 2CoPO4F cathode materials

Quang Duc Truong, Murukanahally K. Devaraju, Yoshiyuki Ganbe, Takaaki Tomai, Itaru Honma

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Li2CoPO4F cathode materials have been synthesized by a two-step method combining a sol-gel route and solid state reaction. X-ray diffraction (XRD) analysis confirmed that the Li2CoPO4F was well-crystallized in orthorhombic crystal structure with Pnma space group. From the high resolution transmission electron microscopy (HRTEM) image; the lattice fringes of {001} and {100} are well-resolved. HRTEM image and selected area electron diffraction (SAED) pattern reveal the highly crystalline nature of Li2CoPO4F having an ordered orthorhombic crystal structure. The Co atoms chains of Li2CoPO4F have been observed using high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The Raman and Fourier transform infrared spectroscopy (FTIR) spectra indicate the symmetry and stability of the Li 2CoPO4F structure. The Li2CoPO4F cathode materials delivered an initial discharge capacity of 91 mAhg -1 at C/10 rate with good cyclic performance. The discharge profile of Li2CoPO4F shows a plateau at 5.0 V; revealing its importance as potentially high-voltage cathode.

Original languageEnglish
Pages (from-to)245-251
Number of pages7
JournalElectrochimica Acta
Volume127
DOIs
Publication statusPublished - 2014 May 1

Keywords

  • Electrochemistry
  • Lithium-ion batteries
  • Structural analysis

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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