Local structural studies of LiCryMn2-yO4 cathode materials for Li-Ion batteries

Mayumi Kaneko, Shinsuke Matsuno, Takeshi Miki, Masanobu Nakayama, Hiromasa Ikuta, Yoshiharu Uchimoto, Masataka Wakihara, Katsuyuki Kawamura

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37 Citations (Scopus)

Abstract

The local crystal structure of a spinel-type solid solution, LiCryMn2-yO4 has been studied by molecular dynamics (MD) and extended X-ray absorption fine structure (EXAFS), respectively. The MD simulation was carried out using a partially ionic model, and the relevant potential parameters were optimized. The simulated compositional dependence of lattice parameters and thermal expansion coefficients were found to be reproducible with experimental values. From the simulation results, the pair correlation function curve for Mn4+-O in LiMn3+Mn4+O4 was broader than that in LiCr3+Mn4+O4. This indicates that the local distortion of the lattice is suppressed by substituting a Cr3+ ion for a Mn3+ ion. Similar results were also obtained by EXAFS measurement. The force constant k derived from MD simulation increases by substituting Cr3+ ion for Mn3+ ion, and this corresponds to the strengthening of the bond between a transition metal cation and an oxide ion.

Original languageEnglish
Pages (from-to)1727-1733
Number of pages7
JournalJournal of Physical Chemistry B
Volume107
Issue number8
DOIs
Publication statusPublished - Feb 27 2003

ASJC Scopus subject areas

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

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    Kaneko, M., Matsuno, S., Miki, T., Nakayama, M., Ikuta, H., Uchimoto, Y., Wakihara, M., & Kawamura, K. (2003). Local structural studies of LiCryMn2-yO4 cathode materials for Li-Ion batteries. Journal of Physical Chemistry B, 107(8), 1727-1733. https://doi.org/10.1021/jp0265337