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Chemical delithiation, thermal transformations and electrochemical behaviour of iron- substituted lithium nickelate.

Published online by Cambridge University Press:  18 March 2011

Pedro Lavela ,
Carlos Pérez-Vicente  and
José L. Tirado
Pedro Lavela
Affiliation:
Laboratorio de Química Inorgánica, Universidad de Córdoba, Campus de Rabanales. Edificio C3, Planta 1. 14071 Cordoba, Spain
Carlos Pérez-Vicente
Affiliation:
Laboratorio de Química Inorgánica, Universidad de Córdoba, Campus de Rabanales. Edificio C3, Planta 1. 14071 Cordoba, Spain
José L. Tirado
Affiliation:
Laboratorio de Química Inorgánica, Universidad de Córdoba, Campus de Rabanales. Edificio C3, Planta 1. 14071 Cordoba, Spain
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Abstract

Chemical deintercalation in Fe-substituted lithium nickelate and its effects on the thermal stability and electrochemical behaviour are studied. A sample with Fe:Ni ratio of 1:9 was used as the starting material. Chemical deintercalation of the ceramic product was achieved by acid treatment with 0.6 M aqueous hydrochloric acid solutions at room temperature. The atomic Fe:Ni ratio remained unaffected while the Li:(Fe+Ni) ratio decreased significantly down to ca. 0.5 after acid treatment. Infrared spectroscopy was used to discard a proton exchange side reaction. The initial open circuit voltage (OCV) of non-aqueous electrolyte lithium cells using the chemically deintercalated solids was ca. 3.7 V, while 3.0 V were obtained with the pristine oxide. Heat treating the deintercalated solids lead to oxygen evolution at 230°C with the formation of spinel rock-salt structure solids at 600°C. The improved thermal stability as compared with iron-free lithium nickelate is an interesting factor for battery safety.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG9.7
Copyright
Copyright © Materials Research Society 2001

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References

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