A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures

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 a...

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Autores principales: Longinotti, Maria Paula, Corti, Horacio Roberto, Calvo, Ernesto Julio
Publicado: 2015
Materias:
ACN-DMSO mixtures
Electrical conductivity
lithium
redox potential
solvation
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v154_n_p456_Mozhzhukhina
http://hdl.handle.net/20.500.12110/paper_00134686_v154_n_p456_Mozhzhukhina
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00134686_v154_n_p456_Mozhzhukhina
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spelling paper:paper_00134686_v154_n_p456_Mozhzhukhina2023-06-08T14:35:46Z A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures Longinotti, Maria Paula Corti, Horacio Roberto Calvo, Ernesto Julio ACN-DMSO mixtures Electrical conductivity lithium redox potential solvation 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. Fil:Longinotti, M.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Corti, H.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Calvo, E.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v154_n_p456_Mozhzhukhina http://hdl.handle.net/20.500.12110/paper_00134686_v154_n_p456_Mozhzhukhina
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic ACN-DMSO mixtures
Electrical conductivity
lithium
redox potential
solvation
spellingShingle ACN-DMSO mixtures
Electrical conductivity
lithium
redox potential
solvation
Longinotti, Maria Paula
Corti, Horacio Roberto
Calvo, Ernesto Julio
A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
topic_facet ACN-DMSO mixtures
Electrical conductivity
lithium
redox potential
solvation
description 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.
author Longinotti, Maria Paula
Corti, Horacio Roberto
Calvo, Ernesto Julio
author_facet Longinotti, Maria Paula
Corti, Horacio Roberto
Calvo, Ernesto Julio
author_sort Longinotti, Maria Paula
title A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
title_short A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
title_full A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
title_fullStr A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
title_full_unstemmed A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
title_sort conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v154_n_p456_Mozhzhukhina
http://hdl.handle.net/20.500.12110/paper_00134686_v154_n_p456_Mozhzhukhina
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