Sn(II)-treated MoO3 as cathode material for rechargeable lithium batteries

A. M. Hashim, G. H. Wrodnigg, M. H. Askar, M. Winter, J. H. Albering, J. O. Besenhard

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    Abstract

    We report on the synthesis and structural, thermal and electrochemical characterisation of reduced molybdenum oxides with layered α-MoO 3 type structure. The samples have been prepared by reactions of various amounts of water-free tin dichloride with fine-particulated orthorhombic molybdenum trioxide in n-hexane (non-aqueous media) or in aqueous media, which yielded materials with different Sn:Mo ratio. XRD investigations of these materials proved that the crystal structure of the layered α-MoO 3 has been maintained after the reduction process. No crystalline impurity phases (e.g. tin oxides) could be detected by XRD. The tin-reduced samples exhibited a drastically improved cycling stability and capacity retention on cycling in 1 M LiC104/propylene carbonate, i.e. the discharge capacities were well above 100 mAh g-1 after 20 cycles whereas the non-treated MoO3 (reference sample) has retained only about 45 mAh g-1. At higher cycle numbers (approx. cycle 100) the discharge capacity of the reduced molybdenum oxides stabilises at a level of approx. 100 mAh g-1. This significant improvement of the rechargeability may be related to improved electronic conductivity and/or higher structural stabilisation of the layered MoO3 structure either due to (i) a coating of the MoO3 particles with a protective thin layer of a tin containing compounds, and/or (ii) an amorphisation of the structure after reductive treatment. Further efforts of this study were devoted to a variation of the conductive carbon content in the electrode composition and to changes of cut-0ff voltages and current densities.

    Original languageEnglish
    Pages (from-to)183-191
    Number of pages9
    JournalIonics
    Volume8
    Issue number3-4
    Publication statusPublished - May 2002

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    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Engineering(all)
    • Materials Science(all)
    • Physics and Astronomy(all)

    Cite this

    Hashim, A. M., Wrodnigg, G. H., Askar, M. H., Winter, M., Albering, J. H., & Besenhard, J. O. (2002). Sn(II)-treated MoO3 as cathode material for rechargeable lithium batteries. Ionics, 8(3-4), 183-191.