Effect of fluorine on the electrochemical properties of layered Li(Ni 0.5Mn0.5)O2 cathode materials

S. H. Kang, I. Belharouak, Y. K. Sun, K. Amine

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Fluorine-doped Li(Ni0.5Mn0.5)O2 or Li(Ni0.5+0.5zMn0.5-0.5z)O2-zFz (0 ≤ z ≤ 0.2) has been synthesized by a solid-state reaction method. X-ray diffraction patterns showed that the synthesized materials had layered α-NaFeO2-type structure (R3̄m); the Rietveld analysis revealed that lattice parameters (a and c of hexagonal setting) and degree of cation mixing increased with increasing fluorine content (z). Initial discharge capacity of the cathode materials increased with z, showed maximum at z = 0.02, and decreased afterwards. At the same time, impedance of the cathode materials decreased with z, reached minimum at z = 0.02, and then increased afterwards. Among the materials prepared and studied in this work, Li(Ni 0.51Mn0.49)O1.98F0.02 exhibited the best electrochemical properties in terms of capacity (151 mAh g-1), impedance (67 Ω cm2) and cycleability (no capacity fading up to 40 cycles).

Original languageEnglish
Pages (from-to)650-653
Number of pages4
JournalJournal of Power Sources
Volume146
Issue number1-2
DOIs
Publication statusPublished - 26 Aug 2005
Externally publishedYes

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Keywords

  • Fluorine substitution
  • Layered material
  • Li(NiMn)O
  • Li-ion battery

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

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