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Cation Ordering in Layered O3 Li[NixLi1/3-2x/3Mn2/3-x/3]O2 (0 ≤ x ≤ 1/2) Compounds

Meng, Y. S., Ceder, G., Grey, C. P., Yoon, W.-S., Jiang, M., Bréger, J., Shao-Horn, Y.·2005·Chemistry of Materials

Abstract

Three layered compounds, Li[Ni 1/2 Mn 1/2 ]O 2 ( x = 1 / 2 ), Li[Li 1/9 Ni 1/ 3 Mn 5/9 ]O 2 ( x = 1 / 3 ), and Li 2 MnO 3 ( x = 0) of the Li[Ni x Li 1/3 - 2 x /3 Mn 2/ 3 - x /3 ]O 2 series were studied by electron diffraction in combination with synchrotron X-ray powder diffraction analyses. In-plane √3 a hex. × √3 a hex. ordering was found in all three samples, and a likely model for the occupancies of Li +, Ni 2+, and Mn 4+ on the sublattices of the transition metal layer was proposed. Perpendicular to the c hex. axis, the ordered transition metal layers in the layered Li[Ni 1/2 Mn 1/2 ]O 2 and Li[Li 1/9 Ni 1/3 Mn 5/9 ]O 2 crystals could be arranged mostly in the P 3 1 12 stacking with some C 2/ m stacking (such as abab... ) abnormally. It is believed that the nickel ions in the lithium layer of these two samples play an important role in the stacking of transition metal layers. Moreover, electron diffraction analyses suggested that individual Li 2 MnO 3 crystals that were obtained at 850 °C had at least two different C 2/ m stacking sequence variants ( abab..., caca..., and cbcb... ) coexisting along the c hex. axis, which were associated with the presence of some P 3 1 12 stacking abnormally.

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Authors
Meng, Y. S., Ceder, G., Grey, C. P., Yoon, W.-S., Jiang, M., Bréger, J., & Shao-Horn, Y.
Venue
Chemistry of Materials
Published
2005-03-23
Volume
17
Issue
9
Pages
2386-2394
ISSN
  • 0897-4756 (ISSN-L)
  • 1520-5002
OpenAlex
W1998222681
Cited by
312
References
0
FWCI
8.26
Type
journal article
Language
en
Open access
closed

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