INVESTIGADORES
CALVO Ernesto Julio
artículos
Título:
A conductivity study of preferential solvation of lithium ion in acetonitrile-dimethyl sulfoxide mixtures
Autor/es:
MOZHZHUKHINA N.; LONGINOTTI, M.P.; H.R. CORTI,; CALVO EJ,
Revista:
ELECTROCHIMICA ACTA
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 154 p. 456 - 461
ISSN:
0013-4686
Resumen:
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.