Structural and Electrochemical Study of New LiNi0.5TixMn1.5-xO4 Spinel Oxides for 5-V Cathode Materials

Autor:	Ricardo Alcántara, Pedro Lavela, J. P. Peres, C. Jordy, A. de Guibert, Ph. Biensan, José L. Tirado, M. Jaraba
Rok vydání:	2003
Předmět:	Materials science General Chemical Engineering Spinel Neutron diffraction Analytical chemistry Oxide chemistry.chemical_element General Chemistry Manganese engineering.material Microstructure Titanium oxide chemistry.chemical_compound chemistry Materials Chemistry engineering Lithium oxide Titanium
Zdroj:	Chemistry of Materials. 15:2376-2382
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm034080s
Popis:	New LiNi0.5TixMn1.5-xO4 (0.05 ≤ x ≤ 0.6) spinel oxide materials have been obtained. The cubic unit cell parameter increases with the substitution of manganese by titanium in the octahedrally coordinated 16d sites, as evidenced by X-ray and neutron diffraction studies. For Ti-free LiNi0.5Mn1.5O4 up to x = 0.10, a decrease in the line broadening of the X-ray diffraction profiles is observed. For x > 0.1, X-ray line broadening and a progressive loss of resolution in the FTIR spectral profiles are observed. The presence of small amounts of Ti (x = 0.05 and 0.1) yields a net improvement of the electrochemical performance, whereas a deterioration of the reversible capacity is observed for large Ti contents. The electrochemical oxidation mechanism involves the appearance of two or three cubic phases with different lattice parameters, as evidenced by ex situ XRD of electrodes prepared at different depths of the first charge.
Databáze:	OpenAIRE
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