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

24 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

Fingerprint

Fluorine
Electrochemical properties
fluorine
Cathodes
cathodes
impedance
fading
Rietveld analysis
lattice parameters
diffraction patterns
Solid state reactions
Diffraction patterns
Lattice constants
solid state
Cations
cations
cycles
Positive ions
X ray diffraction
x rays

Keywords

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

ASJC Scopus subject areas

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

Cite this

Effect of fluorine on the electrochemical properties of layered Li(Ni 0.5Mn0.5)O2 cathode materials. / Kang, S. H.; Belharouak, I.; Sun, Y. K.; Amine, K.

In: Journal of Power Sources, Vol. 146, No. 1-2, 26.08.2005, p. 650-653.

Research output: Contribution to journalArticle

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AU - Belharouak, I.

AU - Sun, Y. K.

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AB - 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).

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KW - Li-ion battery

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