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Doped Li-Mn spinels: Physical/chemical characteristics and electrochemical performance in Li batteries (Articolo in rivista)

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Doped Li-Mn spinels: Physical/chemical characteristics and electrochemical performance in Li batteries (Articolo in rivista) (literal)

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G. Pistoia, A. Antonini, R. Rosati, C. Bellitto, G.M. Ingo [2] (1997)
Doped Li-Mn spinels: Physical/chemical characteristics and electrochemical performance in Li batteries
in Chemistry of materials; American Chemical Society, Washington (Stati Uniti d'America)
(literal)

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Il presente lavoro è stato citato 112 volte (sino al 2013) e quindi può essere ritenuto di riferimento per la comunità che si occupa della preparazione edella valutazione delle proprietà e prestazioni di batterie innovative al Litio. (literal)

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G. Pistoia [1], A. Antonini [1], R. Rosati [1], C. Bellitto [2], G.M. Ingo [2] [1] CNR,CENTRO STUDIO ELETTROCHIMICA & CHIMICA FISICA INTERFASI,VIA CASTRO LAURENZIANO 7, I-00161 ROME, ITALY. [2] CNR,ISTITUTO DI CHIMICA DEI MATERIALI,AREA RICERCA DI ROMA, I-00016 MONTEROTONDO, ROME, ITALY (literal)

Titolo

Doped Li-Mn spinels: Physical/chemical characteristics and electrochemical performance in Li batteries (literal)

Abstract

Several doped spinel-type Li-Mn oxides of formula Li1+xMyMn2-(x+y)O4+2, where Mn is partly replaced by Li, Cu, Zn, Ni, Co, Fe, Cr, Ga, Al, B, or Ti, were prepared by a solid-state reaction at 730 degrees C. These spinels were investigated by X-ray powder diffraction, thermal analysis, slow step voltammetry, and galvanostatic cycling at medium-high rates. Even substitutional levels as low as 0.05 atom/formula unit produce structural effects that are reflected in the electrochemical characteristics. The substituents may occupy either tetrahedral 8a sites or octahedral 16d sites. Examples of the first type of substitution are provided by Ga3+ and Zn2+, while octahedral sites are preferred by, e.g., Ni2+ and Cr3+. Cycling at practical rates produces capacities of similar to 100 mA h/g for the best materials with limited capacity losses (3-6.10(-2) mA h/g.cycle). The lower Mn3+ content with respect to undoped spinel explains the initially lower capacities. (literal)

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