title: Structural studies of Li1.2Mn0.55Ni0.15Co0.1O2electrode material.
abstract: A pristine Li-rich layered electrode material with composition Li1.2Mn0.55Ni0.15Co0.1O2was characterized by X-ray diffraction, transmission electron microscopy, and scanning transmission electron microscopy to determine whether it is a coherent mixture of monoclinicC2/mLi2MO3and trigonal [Formula: see text] LiMO2phases or a solid solution of the monoclinic phase. Contradictory results have been previously reported which can be attributed to the complexity and structural similarity of the monoclinic and trigonal phases. We resolved this uncertainty by combining diffraction and imaging techniques that probe complimentary length scales. Our results demonstrate that the structure is primarily monoclinic, supporting the solid solution model, although near surface structural alterations were also observed.
authors.affiliation: Materials Measurement Laboratory, National Institute of Standards Technology, Gaithersburg, MD 20899 USA.
authors.forename: Aaron C
authors.initials: AC
authors.lastname: Johnston-Peck
authors.affiliation: Materials Measurement Laboratory, National Institute of Standards Technology, Gaithersburg, MD 20899 USA.
authors.forename: Igor
authors.initials: I
authors.lastname: Levin
authors.affiliation: Materials Measurement Laboratory, National Institute of Standards Technology, Gaithersburg, MD 20899 USA.
authors.forename: Andrew A
authors.initials: AA
authors.lastname: Herzing
authors.affiliation: Materials Measurement Laboratory, National Institute of Standards Technology, Gaithersburg, MD 20899 USA.
authors.forename: Leonid A
authors.initials: LA
authors.lastname: Bendersky
keywords: Lithium Battery Material; Scanning Transmission Electron Microscopy; X-ray Diffraction