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Nanosize LiNiyMn2 - yO4 (0 < y ≤ 0.5) spinels synthesized by a sucrose-aided combustion method. Characterization and electrochemical performance

AuthorsLazarraga, M.G.; Pascual, L.; Gadjov, H.; Kovacheva, D.; Petrov, K.; Amarilla, José Manuel ; Rojas, Rosa M. ; Martín-Luengo, María Ángeles ; Rojo, J. M.
Issue Date22-Apr-2004
PublisherRoyal Society of Chemistry
CitationJournal of Materials Chemistry 14(10): 1640-1647 (2004)
AbstractNanosize crystalline cathode materials of LiNiyMn2 - yO4 (0 < y ≤ 0.5) composition and spinel-type structure have been obtained by a single-step sucrose-aided self-combustion method. The as-prepared samples contained some amorphous organic impurities that were removed after a short period of heating at 500°C. The pure single-phase spinels have been characterized by X-ray diffraction, transmission electron microscopy, chemical analysis, and nitrogen sorption isotherms. The samples consist of particles (ca. 24 nm size) that are aggregated in clusters (ca. 1 μm size) in which mesopores (10-80 nm size) appear among the particles. Additional heating at 800° and 1000°C produces a slight increase in the cubic lattice parameter and a pronounced increase in particle size (> 100 nm). Electrical conductivity decreases as the Ni content increases in accordance with an electron hopping mechanism between Mn3+ and Mn4+ ions. The 500°C- and 800°C-heated LiNi0.5Mn 1.5O4 samples show good electrochemical behaviour at 4.7 V as cathode materials. The capacity (132.7 mA h g-1) found is close to the nominal capacity (146.7 mA h g-1) and remains constant for current densities in the range C/24-2C (where C = 2.6 mA cm-2). At higher current densities (2C-10C) the capacity decreases progressively. The cyclability at the C current density is ca. 99.7% for both samples.
Publisher version (URL)http://doi.org/10.1039/B314157H
Appears in Collections:(ICMM) Artículos
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