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

doi:10.1016/j.jpowsour.2005.03.084

Effect of fluorine on the electrochemical properties of layered Li(Ni _0.5Mn_0.5)O₂ cathode materials

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

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

Fluorine-doped Li(Ni_0.5Mn_0.5)O₂ or Li(Ni_0.5+0.5zMn_0.5-0.5z)O_2-zF_z (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 _0.51Mn_0.49)O_1.98F_0.02 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 language	English
Pages (from-to)	650-653
Number of pages	4
Journal	Journal of Power Sources
Volume	146
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jpowsour.2005.03.084
State	Published - Aug 26 2005
Externally published	Yes

Funding

The authors acknowledge the financial support of the U.S. Department of Energy, FreedomCAR and Vehicle Technologies Program, under Contract No. W-31-109-Eng-38.

Funders	Funder number
U.S. Department of Energy	W-31-109-Eng-38

Keywords

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2005.03.084

Cite this

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

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 (R{\=3}m); 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).",

keywords = "Fluorine substitution, Layered material, Li(NiMn)O, Li-ion battery",

author = "Kang, {S. H.} and I. Belharouak and Sun, {Y. K.} and K. Amine",

year = "2005",

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doi = "10.1016/j.jpowsour.2005.03.084",

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journal = "Journal of Power Sources",

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T1 - Effect of fluorine on the electrochemical properties of layered Li(Ni 0.5Mn0.5)O2 cathode materials

AU - Kang, S. H.

AU - Belharouak, I.

AU - Sun, Y. K.

AU - Amine, K.

PY - 2005/8/26

Y1 - 2005/8/26

N2 - 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).

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).

KW - Fluorine substitution

KW - Layered material

KW - Li(NiMn)O

KW - Li-ion battery

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