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Layered cobalt and nickel oxide cathodes: a comparison of their structural and chemical stabilities

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3 Author(s)
Manthiram, A. ; Mater. Inst., Texas Univ., Austin, TX, USA ; Chebiam, R.V. ; Prado, F.

Layered LiNi0.85Co0.15O2 cathodes have drawn much attention recently due to its higher capacity compared to the currently used layered LiCoO2 cathode. However, the structural and chemical stabilities of the LiNi0.85Co0.15O2 cathodes during long-term cycling in lithium-ion cells have not been fully assessed. From a systematic investigation, the structural and chemical stabilities of the two systems are compared. Wet-chemical analysis of chemically delithiated Li1-xCoO2 and Li1-xNi0.85Co0.15O2 establish that the former system tends to lose oxygen from the lattice for (1-x)<0.5, which limits its capacity to 140 mAh/g, while the latter system does not suffer from oxygen loss at least for 0.3⩽(1-x)⩽1. However, the nickel oxide system suffers from structural instability under mild heat (T>50°C) due to a migration of Ni3+ ions from the nickel layer to the lithium layer. The differences in the structural and chemical stabilities between the two systems are explained based on crystal field stabilization energies and the relative positions of metal:3d and O:2p bands

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Applications and Advances, 2001. The Sixteenth Annual Battery Conference on

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