期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 36, 页码 10686-10692出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12186k
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资金
- Spanish Ministerio de Ciencia e Innovacion (MICINN, Direccion General de Cooperacion Internacional) [ACI2009-0972]
- MICINN [MAT2010-19837-C06, MAT2010-19460]
- Comunidad de Madrid [S2009/PPQ-1626]
- UCM [JCI-2010-08229]
- Department of Science and Technology, Govt. of India
- INSA, New Delhi
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 (alpha-NaFeO2) structure, as revealed by powder XRD data. Magnetic susceptibility data suggest that the oxidation states of transition metals are Li3Co3+(ls)Ru4+(ls) O-5 (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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