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Abstract:

The electrical mobility of LiPF6 in acetonitrile-dimethyl sulfoxide (ACN-DMSO) mixtures, a potential electrolyte in oxygen cathodes of lithium-air batteries, has been studied using a very precise conductance technique, which allowed the determination of the infinite dilution molar conductivity and association constant of the salt in the whole composition range. In the search for preferential Li+ ion solvation, we also measured the electrical conductivity of tetrabutylammonium hexafluorophosphate (TBAPF6), a salt formed by a bulky cation, over the same composition range. The results show a qualitative change in the curvature of the LiPF6 molar conductivity composition dependence for ACN molar fraction (xACN) ∼ 0.95, which was not observed for TBAPF6. The dependence of the measured Li/Li+ couple potential with solvent composition also showed a pronounced change around the same composition. We suggest that these observations can be explained by Li+ ion preferential solvation by DMSO in ACN-DMSO mixtures with very low molar fractions of DMSO. © 2014 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
Autor:Mozhzhukhina, N.; Longinotti, M.P.; Corti, H.R.; Calvo, E.J.
Filiación:Instituto de Química Física de Los Materiales, Medio Ambiente y Energía, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina
Departamento de Física de la Materia Condensada, Comisión Nacional de Energía Atómica, Avda. General Paz 1499, San Martín, Buenos Aires, 1650, Argentina
Palabras clave:ACN-DMSO mixtures; Electrical conductivity; lithium; redox potential; solvation
Año:2015
Volumen:154
Página de inicio:456
Página de fin:461
DOI: http://dx.doi.org/10.1016/j.electacta.2014.12.022
Título revista:Electrochimica Acta
Título revista abreviado:Electrochim Acta
ISSN:00134686
CODEN:ELCAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v154_n_p456_Mozhzhukhina

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Citas:

---------- APA ----------
Mozhzhukhina, N., Longinotti, M.P., Corti, H.R. & Calvo, E.J. (2015) . A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures. Electrochimica Acta, 154, 456-461.
http://dx.doi.org/10.1016/j.electacta.2014.12.022
---------- CHICAGO ----------
Mozhzhukhina, N., Longinotti, M.P., Corti, H.R., Calvo, E.J. "A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures" . Electrochimica Acta 154 (2015) : 456-461.
http://dx.doi.org/10.1016/j.electacta.2014.12.022
---------- MLA ----------
Mozhzhukhina, N., Longinotti, M.P., Corti, H.R., Calvo, E.J. "A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures" . Electrochimica Acta, vol. 154, 2015, pp. 456-461.
http://dx.doi.org/10.1016/j.electacta.2014.12.022
---------- VANCOUVER ----------
Mozhzhukhina, N., Longinotti, M.P., Corti, H.R., Calvo, E.J. A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures. Electrochim Acta. 2015;154:456-461.
http://dx.doi.org/10.1016/j.electacta.2014.12.022