Conductivity and Solvation of Li+ Ions of LiPF6 in Propylene Carbonate Solutions

Kazutaka Kondo, Mitsuru Sano, Akio Hiwara, Takehiko Omi, Miho Fujita, Akio Kuwae, Masayasu Iida, Koichi Mogi, Haruhiko Yokoyama

    Research output: Contribution to journalArticlepeer-review

    137 Citations (Scopus)

    Abstract

    Solutions of lithium hexafluorophosphate, LiPF6, in propylene carbonate (4-methyl-1,3-dioxolan-2-one; denoted by PC hereafter) in the concentration range from 0.0 to 3.29 M (M = mol dm-3) have been studied regarding their conductivities, viscosities, and self-diffusion coefficients of PC by the NMR field gradient technique, Raman spectra, and NMR spectra. Walden's products are almost constant in the range up to and over 3.0 M. Therefore, Li ions are considered to be quite free from the firm interaction with anions even in such concentrated solutions. The appearance of the maximum conductivity at about 0.8 M is explained by associating with the concentration dependence of the solution viscosity. A remarkable increase in the solution viscosity was observed in a concentration beyond 2.0 M, and it can be ascribed to the cluster formation of lithium ions with PC molecules of the solvent. Such an idea of clusters can reasonably interpret some of the characteristic changes of the viscosities, the diffusion coefficients, the Raman spectra, and the NMR spectra at concentrations over 2 M.

    Original languageEnglish
    Pages (from-to)5040-5044
    Number of pages5
    JournalJournal of Physical Chemistry B
    Volume104
    Issue number20
    DOIs
    Publication statusPublished - May 25 2000

    All Science Journal Classification (ASJC) codes

    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films
    • Materials Chemistry

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