title: Role of oxygen holes in Li(x)CoO(2) revealed by soft X-ray spectroscopy.
abstract: The fundamental electronic structure of the widely used battery material Li(x)CoO(2) still remains a mystery. Soft x-ray absorption spectroscopy of Li(x)CoO(2) reveals that holes with strong O 2p character play an essential role in the electronic conductivity of the Co(3+)/Co(4+) mixed valence CoO(2) layer. The oxygen holes are bound to the Co(4+) sites and the Li-ion vacancy, suggesting that the Li-ion flow can be stabilized by oxygen hole back flow. Such an oxygen hole state of Li(x)CoO(2) is unique among the various oxide-based battery materials and is one of the key ingredients to improving their electronic and Li-ion conductivities.
authors: Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Chiba 277-8561, Japan.
authors: T
authors: T
authors: Mizokawa
authors: Y
authors: Y
authors: Wakisaka
authors: T
authors: T
authors: Sudayama
authors: C
authors: C
authors: Iwai
authors: K
authors: K
authors: Miyoshi
authors: J
authors: J
authors: Takeuchi
authors: H
authors: H
authors: Wadati
authors: D G
authors: DG
authors: Hawthorn
authors: T Z
authors: TZ
authors: Regier
authors: G A
authors: GA
authors: Sawatzky