Comparison of structural changes in fully delithiated Lix [Ni13 Co13 Mn13] O2 and Lix [Ni0.33 Co0.33 Mn0.30 Mg0.04] O1.96 F0.04 cathodes (x=0) upon thermal annealing

Yoojung Kim, Junho Eom, Min Gyu Kim, Yang-Kook Sun, Chong Seung Yoon

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Abstract

This study compared the structural changes in Lix [Ni13 Co13 Mn13] O2 and Lix [Ni0.33 Co0.33 Mn0.3 Mg0.04] O1.96 F0.04 cathodes (x=0) occurring after full delithiation and subsequent heat-treatment at 200, 300, and 400°C using X-ray diffraction (XRD), transmission electron microscopy, and X-ray absorption spectra (XAS). In both cathodes, XRD patterns at x=0 showed a layered O3 -type structure (CdCl2), but subsequent thermal annealing led to a similar structure decomposition to a Co3 O4 -type spinel and possible new O3- Ni13 Mn13 O2+δ -type layered phases. However, the XAS spectra clearly showed that the Lix [Ni0.33 Co0.33 Mn0.3 Mg0.04] O1.96 F0.04 exhibited much improved structural stability, showing a suppression of the phase decomposition to spinel Co3 O4, as evidenced by a decrease in the FT peak intensity of corner-shared CoO6 octahedra at ∼3.2 Å.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume154
Issue number6
DOIs
StatePublished - 2007 Jan 1

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X ray absorption
Absorption spectra
Cathodes
Annealing
Decomposition
Cadmium Chloride
X ray diffraction
Diffraction patterns
Heat treatment
Transmission electron microscopy
spinell
Hot Temperature

Cite this

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title = "Comparison of structural changes in fully delithiated Lix [Ni13 Co13 Mn13] O2 and Lix [Ni0.33 Co0.33 Mn0.30 Mg0.04] O1.96 F0.04 cathodes (x=0) upon thermal annealing",
abstract = "This study compared the structural changes in Lix [Ni13 Co13 Mn13] O2 and Lix [Ni0.33 Co0.33 Mn0.3 Mg0.04] O1.96 F0.04 cathodes (x=0) occurring after full delithiation and subsequent heat-treatment at 200, 300, and 400°C using X-ray diffraction (XRD), transmission electron microscopy, and X-ray absorption spectra (XAS). In both cathodes, XRD patterns at x=0 showed a layered O3 -type structure (CdCl2), but subsequent thermal annealing led to a similar structure decomposition to a Co3 O4 -type spinel and possible new O3- Ni13 Mn13 O2+δ -type layered phases. However, the XAS spectra clearly showed that the Lix [Ni0.33 Co0.33 Mn0.3 Mg0.04] O1.96 F0.04 exhibited much improved structural stability, showing a suppression of the phase decomposition to spinel Co3 O4, as evidenced by a decrease in the FT peak intensity of corner-shared CoO6 octahedra at ∼3.2 {\AA}.",
author = "Yoojung Kim and Junho Eom and Kim, {Min Gyu} and Yang-Kook Sun and Yoon, {Chong Seung}",
year = "2007",
month = "1",
day = "1",
doi = "10.1149/1.2724761",
language = "English",
volume = "154",
journal = "Journal of the Electrochemical Society",
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TY - JOUR

T1 - Comparison of structural changes in fully delithiated Lix [Ni13 Co13 Mn13] O2 and Lix [Ni0.33 Co0.33 Mn0.30 Mg0.04] O1.96 F0.04 cathodes (x=0) upon thermal annealing

AU - Kim, Yoojung

AU - Eom, Junho

AU - Kim, Min Gyu

AU - Sun, Yang-Kook

AU - Yoon, Chong Seung

PY - 2007/1/1

Y1 - 2007/1/1

N2 - This study compared the structural changes in Lix [Ni13 Co13 Mn13] O2 and Lix [Ni0.33 Co0.33 Mn0.3 Mg0.04] O1.96 F0.04 cathodes (x=0) occurring after full delithiation and subsequent heat-treatment at 200, 300, and 400°C using X-ray diffraction (XRD), transmission electron microscopy, and X-ray absorption spectra (XAS). In both cathodes, XRD patterns at x=0 showed a layered O3 -type structure (CdCl2), but subsequent thermal annealing led to a similar structure decomposition to a Co3 O4 -type spinel and possible new O3- Ni13 Mn13 O2+δ -type layered phases. However, the XAS spectra clearly showed that the Lix [Ni0.33 Co0.33 Mn0.3 Mg0.04] O1.96 F0.04 exhibited much improved structural stability, showing a suppression of the phase decomposition to spinel Co3 O4, as evidenced by a decrease in the FT peak intensity of corner-shared CoO6 octahedra at ∼3.2 Å.

AB - This study compared the structural changes in Lix [Ni13 Co13 Mn13] O2 and Lix [Ni0.33 Co0.33 Mn0.3 Mg0.04] O1.96 F0.04 cathodes (x=0) occurring after full delithiation and subsequent heat-treatment at 200, 300, and 400°C using X-ray diffraction (XRD), transmission electron microscopy, and X-ray absorption spectra (XAS). In both cathodes, XRD patterns at x=0 showed a layered O3 -type structure (CdCl2), but subsequent thermal annealing led to a similar structure decomposition to a Co3 O4 -type spinel and possible new O3- Ni13 Mn13 O2+δ -type layered phases. However, the XAS spectra clearly showed that the Lix [Ni0.33 Co0.33 Mn0.3 Mg0.04] O1.96 F0.04 exhibited much improved structural stability, showing a suppression of the phase decomposition to spinel Co3 O4, as evidenced by a decrease in the FT peak intensity of corner-shared CoO6 octahedra at ∼3.2 Å.

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