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`Solid State Ionics
`Volume 57, Issues 3–4, October 1992, Pages 311–318
`
`Structure and electrochemistry of LixMnyNi1−yO2
`E. Rossen, C.D.W. Jones, J.R. Dahn
`Department of Physics, Simon Fraser University, Burnaby, B.C., Canada V5A 1S6
`Received 16 March 1992, Accepted 6 April 1992, Available online 13 September 2002
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`doi:10.1016/0167-2738(92)90164-K
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`Abstract
`We show that the solid-solution series LixMnyNi1−yO2 can be prepared as a single phase
`for x near 1 and 0≤y ≤0.5. Using powder X-ray diffraction and Rietveld profile refinement,
`we show that these solid solutions are isostructural with LiNiO2 but with Mn and Ni
`sharing the Ni sites. However, subtle changes in the diffraction profiles show that as y
`increases some mixing of Li atoms into Ni, Mn sites and Ni, Mn atoms into Li sites occurs.
`In addition, the ratio of Li atoms to Ni, Mn atoms in the material increases with y at fixed x,
`suggesting the formation of Mn4+ as y increases. The cation mixing and the presence of
`Mn4+ profoundly affects the electrochemical deintercalation of Li from LixMnyNi1−yO2.
`Electrochemical measurements using Li/ LixMnyNi1−yO2 cells show that as y increases the
`amount of Li which can be reversibly cycled in these materials decreases, thus limiting
`the practical usefulness of these materials.
`
`Copyright © 1992 Published by Elsevier B.V.
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