Oxygen Contribution on Li-Ion Intercalation-Deintercalation in LiAl[sub y]Co[sub 1−y]O[sub 2] Investigated by O K-Edge and Co L-Edge X-Ray Absorption Spectroscopy

The electronic structure of the electrochemically Li-ion deintercalated system has been investigated intensively with compositional value variation using soft X-ray absorption spectroscopy (XAS) for oxygen K-edge and Co -edge. To get reasonably good XAS spectra for the electrochemically Li-ion deintercalated system, we made binder-free film electrodes using the electrostatic spray deposition technique. The spectral changes of the O K-edge XAS for during charging are relatively more dramatic than those of the Co -edge XAS. From the results of the spectral changes of the Co L-edge and O K-edge XAS between and during charging, it is concluded that the substitution of Al for Co ions in induces more increased oxygen participation in the charge compensation process during charging. © 2002 The Electrochemical Society. All rights reserved.