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Electronic Spin Transition in Nanosize Stoichiometric Lithium Cobalt Oxide

Electronic Spin Transition in Nanosize Stoichiometric Lithium Cobalt Oxide

Danna Qian, Yoyo Hinuma, Hailong Chen, Lin-Shu Du, Kyler J Carroll, Gerbrand Ceder, Clare P Grey, Ying S Meng

J Am Chem Soc. 2012 Apr 11;134(14):6096-9.

PMID: 22448963

Abstract:

A change in the electronic spin state of the surfaces relevant to Li (de)intercalation of nanosized stoichiometric lithium cobalt oxide LiCo(III)O(2) from low-spin to intermediate and high spin is observed for the first time. These surfaces are the ones that are relevant for Li (de)intercalation. From density functional theory calculations with a Hubbard U correction, the surface energies of the layered lithium cobalt oxide can be significantly lowered as a consequence of the spin change. The crystal field splitting of Co d orbitals is modified at the surface due to missing Co-O bonds. The electronic spin transition also has a significant impact on Co(III)-Co(IV) redox potential, as revealed by the change in the lithium (de)intercalation voltage profile in a lithium half cell.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP12190793	Lithium cobalt(III) oxide		12190-79-3	Price

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