We report the vibrational spectra of various layered transition-metal oxides, which are potential cathode materials for advanced Li-ion batteries. They provide high voltage, and remarkable reversibility for lithium intercalation-deintercalation process. Studies were carried out by Raman and FTIR spectroscopies. Oxides such as LiMO_@(M=CO, Ni, Cr) layered compounds and their mixed compounds have been investigated. The local environment of cations against oxygen neighboring atoms has been determined by cosidering polyehdral units building the lattice. Structural modifications induced by intercalation-deintercalation porcess, by cation substitution, or by low-temperature preparation route are examined.
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