Electrochemical and structural characterization of LiNi{sub 1{minus}y}Co{sub y}O{sub 2} (0 {le} y {le} 0.2) positive electrodes during initial cycling
The initial charge/discharge behavior of LiNi{sub 1{minus}y}Co{sub y}O{sub 2} (0 {le} y {le} 0.2) positive electrodes has been closely examined by neutron diffraction, X-ray diffraction, X-ray absorption, and electrochemical methods. Charge/discharge experiments and neutron diffraction refinements show that capacity loss during the initial cycling of LiNi{sub 1{minus}y}Co{sub y}O{sub 2} (0 {le} y {le} 0.2) increases linearly with the excess nickel content controlled by cobalt substitution for nickel. Charge/discharge cycling with gradually increasing depth of charge indicates that most of the initial capacity loss takes place in the early stages of the first charge. X-ray absorption near-edge spectra reveal that the nickel and cobalt ions in Li{sub 1{minus}x}Ni{sub 1{minus}y}Co{sub y}O{sub 2} are simultaneously oxidized and that the local structure of MO{sub 6} (M = Ni, Co) octahedra is slightly distorted upon lithium deintercalation.
- Research Organization:
- Yonsei Univ., Seoul (KR)
- OSTI ID:
- 20080567
- Journal Information:
- Journal of the Electrochemical Society, Vol. 147, Issue 5; Other Information: PBD: May 2000; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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