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Related Experiment Videos

(Li0.91Mn0.09)Mn2O4.

H Björk1, H Dabkowska, J E Greedan

  • 1Materials Chemistry, Angström Laboratory, Uppsala University, Box 538, SE-751 21 Uppsala, Sweden. helenb@kemi.uu.se

Acta Crystallographica. Section C, Crystal Structure Communications
|April 21, 2001
PubMed
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Researchers synthesized lithium manganese oxide crystals using a flux method. Manganese substitution in the spinel structure induced Jahn-Teller distortion by lowering the average manganese oxidation state.

Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Lithium manganese oxide (LiMn2O4) is a promising cathode material for lithium-ion batteries.
  • The cubic spinel structure of LiMn2O4 is known for its electrochemical activity.
  • Understanding structural modifications is crucial for optimizing material properties.

Purpose of the Study:

  • To synthesize and characterize lithium manganese oxide crystals with partial lithium substitution by manganese.
  • To investigate the impact of manganese substitution on the crystal structure and oxidation states.
  • To determine the resulting structural distortions, specifically Jahn-Teller distortion.

Main Methods:

  • Flux method synthesis of (Li(0.91)Mn(0.09))Mn(2)O(4) crystals.

Related Experiment Videos

  • Structural analysis to confirm spinel-related structure.
  • Oxidation state determination of manganese ions.

    • Main Results:

    • Successfully synthesized lithium manganese oxide crystals with the composition (Li(0.91)Mn(0.09))Mn(2)O(4).
    • Observed a structure closely related to the cubic spinel LiMn(2)O(4).
    • Confirmed that 9% of lithium ions at the tetrahedral 4a site were substituted by Mn(2+) ions.
    • Demonstrated that this substitution lowered the average Mn oxidation state below +3.5.
    • Observed Jahn-Teller distortion of the MnO(6) octahedron due to the reduced average Mn oxidation state.

    Conclusions:

    • Manganese substitution in lithium manganese oxide spinel influences the crystal structure and electronic properties.
    • The observed Jahn-Teller distortion is a direct consequence of the altered manganese oxidation state.
    • This study provides insights into structure-property relationships in modified lithium manganese oxides.