Role of oxygen holes in LixCoO2 revealed by soft X-ray spectroscopy

Takashi Mizokawa, Y. Wakisaka, T. Sudayama, C. Iwai, K. Miyoshi, J. Takeuchi, H. Wadati, D. G. Hawthorn, T. Z. Regier, G. A. Sawatzky

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

The fundamental electronic structure of the widely used battery material LixCoO2 still remains a mystery. Soft x-ray absorption spectroscopy of LixCoO2 reveals that holes with strong O 2p character play an essential role in the electronic conductivity of the Co3+/Co4+ mixed valence CoO2 layer. The oxygen holes are bound to the Co4+ 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 LixCoO2 is unique among the various oxide-based battery materials and is one of the key ingredients to improving their electronic and Li-ion conductivities.

Original languageEnglish
Article number056404
JournalPhysical Review Letters
Volume111
Issue number5
DOIs
Publication statusPublished - 2013 Aug 2
Externally publishedYes

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oxygen
spectroscopy
electric batteries
x rays
conductivity
ions
x ray absorption
electronics
ingredients
x ray spectroscopy
absorption spectroscopy
electronic structure
valence
oxides

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Mizokawa, T., Wakisaka, Y., Sudayama, T., Iwai, C., Miyoshi, K., Takeuchi, J., ... Sawatzky, G. A. (2013). Role of oxygen holes in LixCoO2 revealed by soft X-ray spectroscopy. Physical Review Letters, 111(5), [056404]. https://doi.org/10.1103/PhysRevLett.111.056404

Role of oxygen holes in LixCoO2 revealed by soft X-ray spectroscopy. / Mizokawa, Takashi; Wakisaka, Y.; Sudayama, T.; Iwai, C.; Miyoshi, K.; Takeuchi, J.; Wadati, H.; Hawthorn, D. G.; Regier, T. Z.; Sawatzky, G. A.

In: Physical Review Letters, Vol. 111, No. 5, 056404, 02.08.2013.

Research output: Contribution to journalArticle

Mizokawa, T, Wakisaka, Y, Sudayama, T, Iwai, C, Miyoshi, K, Takeuchi, J, Wadati, H, Hawthorn, DG, Regier, TZ & Sawatzky, GA 2013, 'Role of oxygen holes in LixCoO2 revealed by soft X-ray spectroscopy', Physical Review Letters, vol. 111, no. 5, 056404. https://doi.org/10.1103/PhysRevLett.111.056404
Mizokawa, Takashi ; Wakisaka, Y. ; Sudayama, T. ; Iwai, C. ; Miyoshi, K. ; Takeuchi, J. ; Wadati, H. ; Hawthorn, D. G. ; Regier, T. Z. ; Sawatzky, G. A. / Role of oxygen holes in LixCoO2 revealed by soft X-ray spectroscopy. In: Physical Review Letters. 2013 ; Vol. 111, No. 5.
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