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Raman study of layered rock‐salt LiCoO 2 and its electrochemical lithium deintercalation
Author(s) -
Inaba Minoru,
Iriyama Yasutoshi,
Ogumi Zempachi,
Todzuka Yasufumi,
Tasaka Akimasa
Publication year - 1997
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199708)28:8<613::aid-jrs138>3.0.co;2-t
Subject(s) - raman spectroscopy , monoclinic crystal system , lithium (medication) , crystal structure , chemistry , ion , electrochemistry , hexagonal lattice , lattice (music) , diffraction , analytical chemistry (journal) , crystallography , mineralogy , materials science , condensed matter physics , optics , electrode , physics , medicine , endocrinology , organic chemistry , chromatography , antiferromagnetism , acoustics
Unpolarized and polarized Raman spectra (200–800 cm ‐1 ) of LiCoO 2 with a layered rock‐salt structure were measured. The Raman‐active lattice modes of LiCoO 2 were assigned by polarized Raman measurements of a c ‐axis oriented thin film. The variation of the Raman spectra of Li 1‐ x CoO 2 powder prepared by electrochemical lithium deintercalation was investigated, and the spectral changes were well correlated with the structural changes determined by x‐ray diffraction except that peak splitting by the distortion in the monoclinic phase was not observed. The observed line broadening of the second hexagonal phase and the monoclinic phase indicated that the lithium ions remaining in the lattice after deintercalation randomly occupy the available sites on the lithium planes in the lattice the layered rock‐salt structure. © 1997 John Wiley & Sons, Ltd.