Structural and electrochemical properties of Li(Fe, Co)xMn2 - xO4 solid solution as 5 V positive electrode materials for Li secondary batteries

Hikari Shigemura, Mitsuharu Tabuchi, Hironori Kobayashi, Hikari Sakaebe, Atsushi Hirano, Hiroyuki Kageyama

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40 Citations (Scopus)

Abstract

Solid solutions, Li(Fe, Co)xMn2 - xO4 (0 ≤ x ≤ 0.5 for Fe, 0 ≤ x ≤ 1.0 for Co) were synthesized by solid state reaction at 1023-1073 K in O2 atmosphere. The compositional dependence of lattice parameters and cation distribution was studied by neutron diffraction Rietveld refinement. It was revealed that Fe and Co partially occupied tetrahedral 8a sites and the 1:3 and 1:1 ordering did not occur on Fe (Co) and Mn ions in octahedral 16d sites. X-Ray absorption fine structure (XAFS) analysis showed the variation of valences and metal-oxygen interatomic distances of Mn, Fe, and Co. The Fe-O distance was longer whereas the Co-O distance was shorter compared to the averaged M16d-O32e distance calculated from the lattice parameters. Charge and discharge properties were studied in voltage range 3.0-5.3 V vs. Li/Li+.

Original languageEnglish
Pages (from-to)1882-1891
Number of pages10
JournalJournal of Materials Chemistry
Volume12
Issue number6
DOIs
Publication statusPublished - 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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