First-principles calculations of migration energy of lithium ions in halides and chalcogenides

Ippei Kishida, Yukinori Koyama, Akihide Kuwabara, Tomoyuki Yamamoto, Fumiyasu Oba, Isao Tanaka

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    Abstract

    Migration of Li+ ions via the vacancy mechanism in LiX (X = F, Cl, Br, and I) with the rocksalt and hypothetical zinc blende structures and Li2X (X = O, S, Se, and Te) with the antifluorite structure has been investigated using first-principles projector augmented wave calculations with the generalized gradient approximation. The migration paths and energies, determined by the nudged-elastic-band method, are discussed on the basis of two idealized models: the rigid-sphere and charged-sphere models. The trajectories and energy profiles of the migration in these lithium compounds vary between these two models, depending on the anion species and crystal structure. The migration energies in LiX with both the rocksalt and hypothetical zinc blende structures show a tendency to decrease with increasing periodic number of the anion species in the periodic table. This is consistent with the widely accepted view that anion species with large ionic radii and high polarizabilities are favorable for good ionic conduction. In contrast, Li2O exhibits the lowest migration energy among Li2X compounds, although O is the smallest among the chalcogens, indicating that electrostatic attractive interactions play the dominant role in the inter-ion interactions in Li 2O and, therefore, in the ion migration.

    Original languageEnglish
    Pages (from-to)8258-8262
    Number of pages5
    JournalJournal of Physical Chemistry B
    Volume110
    Issue number16
    DOIs
    Publication statusPublished - 2006 Apr 27

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    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry

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