Electron transfer mechanisms upon lithium deintercalation from LiCoO2 to CoO2 investigated by XPS
Language
en
Article de revue
This item was published in
Chemistry of Materials. 2008, vol. 20, n° 2, p. 583-590
American Chemical Society
English Abstract
Lithium deintercalation of LixCoO2 from x = 1 to x ≈ 0 has been carried out electrochemically. The changes in the electronic structure from LiCoO2 to CoO2 have been investigated by X-ray photoelectron spectroscopy (XPS) ...Read more >
Lithium deintercalation of LixCoO2 from x = 1 to x ≈ 0 has been carried out electrochemically. The changes in the electronic structure from LiCoO2 to CoO2 have been investigated by X-ray photoelectron spectroscopy (XPS) to bring some new developments about the electron transfer mechanisms upon lithium deintercalation. All available XPS core peaks (Co 2p, Co 3p, Co 3s, O 1s, F 1s, P 2p, C 1s) and valence spectra have been analyzed. The contributions of the electrode material and of the electrode/electrolyte interface have been clearly distinguished. We show that cobalt and oxygen simultaneously undergo a partial oxidation process and that the sole participation of oxygen atoms to the charge transfer process, as it is sometimes assumed, can be excluded. The surface film consists of organic and inorganic species resulting from degradation of the electrolyte.Read less <
English Keywords
X-ray photoelectron spectroscopy
Electronic structure
Electron
Lithium deintercalation
Transfer mechanisms
Cobalt lithium oxide
Cobalt dioxide
Origin
Hal imported