Abstract
Lameliar phases with nominal composition were synthesized and characterized by Rietveld refinement of their X‐ray diffraction (XRD) patterns. These materials exhibited the formula with 0.06 ≤ z ≤ 0.08 and were used as positive electrodes in lithium batteries. Their electrochemical performances decreased with increasing iron content. The phases were characterized by XRD and Mössbauer spectroscopy. A solid solution appeared in the entire deintercalation domain 0.28 ≤ x ≤ 0.94, and Rietveld refinement of the XRD patterns allowed us to characterize the variation of structural parameters upon lithium deintercalation. Mössbauer spectroscopy showed that nickel and iron ions were oxidized simultaneously. The fraction of high‐spin was related to the strong ligand field resulting from the presence of the prevailing and ions which lead to a lattice contraction. The behavior upon deintercalation of the phase was compared to that of two‐dimensional . © 2000 The Electrochemical Society. All rights reserved.
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