Electronic structure and x-ray spectra of defect oxides LixCoO2

X-ray absorption, resonant x-ray emission, and x-ray photoelectron spectra of the valence band
and core levels have been measured for LixCoO2 (0.6 < x < 1.0). Resonant O K x-ray emission
spectra of LiCoO2 showed localized excitonic states due to a dd transition between unoccupied and
occupied Co 3d states. On the base of measurements of Co 3s x-ray photoelectron and Co 2p and
O 1s x-ray absorption spectra it was established that in defective cobaltites the electronic holes are
localized mainly in O 2p states. Metallic character of conductivity of defective cobaltites LixCoO2 is
confirmed by a combination of x-ray photoelectron and O 1s x-ray absorption spectra. An evidence
of phase separation in LixCoO2 has been found.