Comparison of structural changes in fully delithiated Li-x[Ni1/3Co1/3Mn1/3]O-2 and Li-x[Ni0.33Co0.33Mn0.30Mg0.04]O1.96F0.04 cathodes (x=0) upon thermal annealing
- Authors
- Kim, Yoojung; Eom, Junho; Kim, Min Gyu; Sun, Yang-Kook; Yoon, Chong Seung; Cho, Jaephil
- Issue Date
- 2007
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.154, no.6, pp A561 - A565
- Journal Title
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- Volume
- 154
- Number
- 6
- Start Page
- A561
- End Page
- A565
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/27195
- DOI
- 10.1149/1.2724761
- ISSN
- 0013-4651
1945-7111
- Abstract
- This study compared the structural changes in Li-x[Ni1/3Co1/3Mn1/3]O-2 and Li-x[Ni0.33Co0.33Mn0.3Mg0.04]O1.96F0.04 cathodes (x = 0) occurring after full delithiation and subsequent heat-treatment at 200, 300, and 400 degrees 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 Co3O4-type spinel and possible new O3-Ni1/3Mn1/3O2+delta-type layered phases. However, the XAS spectra clearly showed that the Li-x[Ni0.33Co0.33Mn0.3Mg0.04]O1.96F0.04 exhibited much improved structural stability, showing a suppression of the phase decomposition to spinel Co3O4, as evidenced by a decrease in the FT peak intensity of corner-shared CoO6 octahedra at similar to 3.2 angstrom. (c) 2007 The Electrochemical Society.
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