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Descripción
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| We describe the synthesis and crystal structure of Li3MRuO5 (M ¿ Co and Ni), new rock salt related oxides. Both the oxides crystallize in the layered LiCoO2 (a-NaFeO2) structure, as revealed by powder XRD data. Magnetic susceptibility data suggest that the oxidation states of transition metals are Li3Co3+(ls)Ru4+(ls) O5 (ls ¿ low spin) for the M ¿ Co compound and Li3Ni2+Ru5+O5 for the M ¿ Ni compound. Electrochemical investigations of lithium deintercalation?intercalation behaviour reveal that both Co and Ni phases exhibit attractive specific capacities of ca. 200 mA h g?1 at an average voltage of 4 V that has been interpreted as due to the oxidation of Co3+ and Ru4+ in Li3CoRuO5 and Ni2+ to Ni4+ in the case of Li3NiRuO5. Thus, a different role of Ru ions is played in the isostructural oxides. Finally, in both cases evidence of irreversible behaviour above 4.2 V is observed and interpreted as formation of high valent ions or alternatively oxidation of oxide ions. | |
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Internacional
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JCR del ISI
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Si |
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Título de la revista
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Journal of Materials Chemistry A |
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ISSN
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0959-9428 |
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Factor de impacto JCR
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5,968 |
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Información de impacto
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Datos JCR del año 2011 |
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Volumen
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1 |
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DOI
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Número de revista
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Desde la página
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10686 |
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Hasta la página
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10692 |
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Mes
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SIN MES |
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Ranking
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