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Comparison of the Chemical Stability of Li1−xCoO2 and Li1−xNi0.85Co0.15O2 Cathodes
Authors:RV ChebiamF Prado  A Manthiram
Institution:Materials Science and Engineering Program, ETC 9.104, The University of Texas at Austin, Austin, Texas, 78712
Abstract:The chemical stability of the layered Li1−xCoO2 and Li1−xNi0.85CoO.15O2 cathodes is compared by monitoring the oxygen content with lithium content (1−x) in chemically delithiated samples. The Li1−xCoO2 system tends to lose oxygen from the lattice at deep lithium extraction while the Li1−xNi0.85Co0.15O2 system does not lose oxygen at least for (1−x)>0.3. This difference seems to result in a lower reversible (practical) capacity (140 mA h/g) for LiCoO2 compared to that for LiNi0.85Co0.15O2 (180 Ma h/g). The loss of significant amount of oxygen leads to a sliding of oxide layers and the formation of a major P3 and a minor O1 phase for the end member CoO2−δ with δ=0.33. In contrast, Ni0.85Co0.15O2−δ with a small amount of δ=0.1 maintains the initial O3 layer structure.
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