The initial charge/discharge behavior of LiNi 1 − y Co y O 2 ( 0 ≤ y ≤ 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 1 − y Co y O 2 ( 0 ≤ y ≤ 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 1 − x Ni 1 − y Co y O 2 are simultaneously oxidized and that the local structure of MO 6 ( M = Ni , Co ) octahedra is slightly distorted upon lithium deintercalation.
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Lee et al. (2000) studied this question.