Artículo
An experimental and theoretical approach on the effect of presence of oxygen in milled graphite as lithium storage material
Robledo, Carla Belén
; Thomas, Jorge Enrique
; Luque, Guillermina Leticia
; Leiva, Ezequiel Pedro M.
; Camara, Osvaldo Raul
; Barraco Diaz, Daniel Eugenio
; Visintin, Arnaldo
Fecha de publicación:
07/2014
Editorial:
Pergamon-Elsevier Science Ltd
Revista:
Electrochimica Acta
ISSN:
0013-4686
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The effect of milling time on the morphology of graphite is characterized by XRD, SEM, BET, FTIR and XPS and the electrochemical response of the resulting materials upon lithium-ion absorption is analyzed using different techniques. As milling time is increased, the particle size diminishes and the amount of oxygen content increases. Concomitantly, the capacity for lithium adsorption also increases because new adsorption sites become available due to more surface area and oxygen functional groups. These effects are interpreted using first-principles calculations, which show that the presence of oxygenated species promotes lithium adsorption at higher potentials. This capacity increase is probably not relevant for lithium-ion batteries since there is no intercalation process but rather an adsorption one, but may be of interest for supercapacitive applications. Diffusion coefficients of lithium for different graphite particle sizes are evaluated. The effects of diffusion, particle size and oxygen content are discussed.
Palabras clave:
None
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Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos(INFIQC)
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Citación
Robledo, Carla Belén; Thomas, Jorge Enrique; Luque, Guillermina Leticia; Leiva, Ezequiel Pedro M.; Camara, Osvaldo Raul; et al.; An experimental and theoretical approach on the effect of presence of oxygen in milled graphite as lithium storage material; Pergamon-Elsevier Science Ltd; Electrochimica Acta; 140; 7-2014; 160-167
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