Issue 12, 1997
From the journal:

Journal of Materials Chemistry

Redox processes in LixNi1–yCoyO2 cobalt-rich phases

Ismael Saadoune,   Michel Ménétrier  and  Claude Delmas  

Abstract

Samples of LixNi0.1Co0.9O2 (0.5≤x≤1.0), prepared by electrochemical deintercalation from LiNi0.1Co0.9O2 , have been characterized by X-ray diffraction, electrical measurements and 7Li NMR spectroscopy. A good correlation is found between the electrochemical behaviour of the LixNi0.1Co0.9O2 electrode materials and their physical properties. During lithium deintercalation from LiNi0.1Co0.9O2 , the trivalent nickel ions are oxidized preferentially to trivalent cobalt ions. This leads to a reversible break in the potential–composition curve around the composition Li0.9Ni0.1Co0.9O2 . This change in the redox regime, which occurs without any structural transformation, has been confirmed by the evolution of the electrical conduction process and that of the 7Li NMR signal.

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Article information

DOI
https://doi.org/10.1039/A703368K
Article type
Paper

J. Mater. Chem., 1997,7, 2505-2511

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Redox processes in LixNi1–yCoyO2 cobalt-rich phases

I. Saadoune, M. Ménétrier and C. Delmas, J. Mater. Chem., 1997, 7, 2505 DOI: 10.1039/A703368K

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