On the LixNi0.70Fe0.15Co0.15O2 system:: An X-ray diffraction and Mossbauer study

被引：31
作者：
Prado, G
Fournès, L
Delmas, C
机构：
[1] CNRS, Inst Chim Condensee Bordeaux, F-33608 Pessac, France
[2] Ecole Natl Super Chim & Phys Bordeaux, F-33608 Pessac, France
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2001年 / 159卷 / 01期
关键词：
lithium transition metal oxides; layered oxides; lithium-ion batteries; intercalation; Mossbauer spectroscopy;
D O I：
10.1006/jssc.2001.9137
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The structural modifications and redox processes occurring during lithium deintercalation from the quasi-stoichiometric Li-0.97(Ni0.70Fe0.15Co0.15)(1.03)O-2 phase were studied by X-ray diffraction and Mossbauer spectroscopy. A solid solution is observed in the whole deintercalation domain (0.08 less than or equal to x less than or equal to 0.97); Rietveld refinement of the XRD pattern shows a strong decrease of the M-O bond distance upon lithium deintercalation. The Mossbauer 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,Ee)O-2 system emphasizes the effect of the small cobalt ions on the facility to oxidize iron ions. (C) 2001 Academic Press
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页码：103 / 112
页数：10
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