title: Relationship between Structural Relaxation, Shear Viscosity, and Ionic Conduction of LiPF6/Propylene Carbonate Solutions.
abstract: The structure and dynamics of the solutions of LiPF6 in propylene carbonate over a concentration range of 0-3 mol/kg are studied with neutron spin echo spectroscopy, alternating-current (AC) conductometry, and shear impedance spectroscopy. The neutron diffraction shows a prepeak at ≈10 nm(-1) in addition to the main peak at ≈14 nm(-1) when the concentration of the salt is no less than 2 mol/kg. Compared with the frequency-dependent shear viscosity and AC conductivity, the relaxation of the shear stress agrees with that expected from the structural relaxation of the main peak. On the other hand, the relaxation of the conductivity is slower than the shear relaxation at all the concentrations, and the former approximately matches with the relaxation of the prepeak at the highest concentration, 3 mol/kg, which is several times slower than that of the main peak. The possible contribution of the prepeak structure to the ionic conduction is discussed.
authors.affiliation: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University , Furo-cho, Chikusa, Nagoya, Aichi 464-8603, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Yamaguchi
authors.affiliation: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University , Furo-cho, Chikusa, Nagoya, Aichi 464-8603, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Yonezawa
authors.affiliation: Department of Chemistry, Faculty of Science, Fukuoka University , Nanakuma, Jonan, Fukuoka 814-0180, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Yoshida
authors.affiliation: Department of Chemistry, Faculty of Science, Fukuoka University , Nanakuma, Jonan, Fukuoka 814-0180, Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamaguchi
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899-6102, United States.|Center for Exploration of Energy and Matter, Indiana University , Bloomington, Indiana 47408-1398, United States.
authors.forename: Michihiro
authors.initials: M
authors.lastname: Nagao
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899-6102, United States.
authors.forename: Antonio
authors.initials: A
authors.lastname: Faraone
authors.affiliation: Materials Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI) , 2-11-1, Iwado-kita, Komae, Tokyo 201-8511, Japan.
authors.forename: Shiro
authors.initials: S
authors.lastname: Seki