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On The LixNi0.70Fe0.15Co0.15O2 System: An X-Ray Diffraction and Mössbauer Study

✍ Scribed by G. Prado; L. Fournès; C. Delmas

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 384 KB
Volume: 159
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2001.9137

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✦ Synopsis

The structural modi5cations and redox processes occurring during lithium deintercalation from the quasi-stoichiometric Li 0.97 (Ni 0.70 Fe 0.15 Co 0.15 ) 1.03 O 2 phase were studied by X-ray di4raction and MoK ssbauer spectroscopy. A solid solution is observed in the whole deintercalation domain (0.084x40.97); Rietveld re5nement of the XRD pattern shows a strong decrease of the M+O bond distance upon lithium deintercalation. The MoK ssbauer study shows that nickel and iron ions are simultaneously oxidized, a large number of the iron ions being stabilized in the high-spin tetravalent state. Comparison with the data obtained in the Li x (Ni, Fe)O 2 system emphasizes the e4ect of the small cobalt ions on the facility to oxidize iron ions.

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