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Issue 23, 2012
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Understanding structural defects in lithium-rich layered oxide cathodes

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Abstract

Planar defects in lithium-rich layered oxides were examined by aberration-corrected scanning transmission electron microscopy (STEM) to understand their formation. Planar defects were found to form during the transition of the transition metal layer from a disordered R[3 with combining macron]m state to a lithium-ordered C2/m state. This disorder-to-order transition resulted in three orientation variants, namely [100], [110], and [1[1 with combining macron]0]. The fundamental mechanism behind the observed defects is a shear of ±b/3[010] on the (001) transition metal planes, which is equivalent to the point group operations lost during the disorder-to-order transition. These displacements also produced twins and single unit cells with P3112 symmetry. Lithium-rich layered oxides with and without nickel show the presence of these three orientation variants.

Graphical abstract: Understanding structural defects in lithium-rich layered oxide cathodes

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Publication details

The article was received on 30 Jan 2012, accepted on 31 Mar 2012 and first published on 08 May 2012


Article type: Paper
DOI: 10.1039/C2JM30575E
J. Mater. Chem., 2012,22, 11550-11555

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    Understanding structural defects in lithium-rich layered oxide cathodes

    K. A. Jarvis, Z. Deng, L. F. Allard, A. Manthiram and P. J. Ferreira, J. Mater. Chem., 2012, 22, 11550
    DOI: 10.1039/C2JM30575E

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