Mixed cobalt and iron substituted lithium nickelate: a structural and electrochemical study

• Published in: Solid state ionics Vol. 138; no. 1; pp. 19 - 30
• Main Authors: Prado, G, Fournès, L, Delmas, C
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-12-2000; Elsevier Science
• Subjects: Chemistry; Condensed matter: structure, mechanical and thermal properties; Electrochemistry; Exact sciences and technology; General and physical chemistry; Inorganic compounds; Iron cobalt lithium nickelate; Layered oxide; Lithium intercalation; Lithium nickelate; Lithium-ion batteries; Miscellaneous (electroosmosis, electrophoresis, electrochromism, electrocrystallization, ...); Mössbauer spectroscopy; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Water, oxides, hydroxides, peroxides; Lithium nickelate; Lithium-ion batteries; Lithium intercalation; Layered oxide; Mössbauer spectroscopy; Iron cobalt lithium nickelate; Nickel oxides; Moessbauer effect; Lithium oxides; Inorganic compounds; Layered crystals; Transition element compounds; Cobalt oxides; Composition effect; XRD; Experimental study; Electrochemical properties; Multi-element compounds; Crystallographic site; Iron oxides; Crystal structure
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/S0167-2738(00)00767-0

Layered Li
1−
z
(Ni
1−
y
Fe
y/2
Co
y/2
)
1+
z
O
2 phases were obtained by high temperature synthesis. A Rietveld characterization of their XRD patterns shows that the presence of cobalt ions leads to a decrease of the amount of 3d cations in the lithium site vs. the Li
1−
z
(Ni
1−
y
Fe
y
)
1+
z
O
2 phases. This result is confirmed by a magnetic properties characterization. A Mössbauer spectroscopy study shows that there are no iron ions in the lithium site and that a very small amount of iron ions occupies a very distorted tetrahedral site. The electrochemical behavior of these materials in lithium batteries was studied. The XRD characterization of the cycled materials shows a very good cycling reversibility without any change in the structure.