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

*この研究の対応する著者

研究成果: Article査読

21 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)8258-8262
ページ数5
ジャーナルJournal of Physical Chemistry B
110
16
DOI
出版ステータスPublished - 2006 4月 27

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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