Abstract
Layered lithium molybdates of formula Li x Mo 2O 4 have been shown earlier to be promising cathode materials for secondary batteries. Nevertheless, a better understanding of the evolution of their transport properties as a function of Li composition and water intercalation is still required. This paper reviews the recent progress towards this understanding. ac and dc measurements have been used to describe the transport properties of the following compositions: Li 1.3Mo 2O 4, Li 2Mo 2O 4, Li 0.5(H 2O) 1.3Mo 2O 4. A combined analysis of the Arrhenius plots of conductivity and NMR spectra for the above samples suggests only one type of atomic site, between the MoO 2 layers, for the Li ions, in agreement with the results obtained by X-ray crystallographic studies. A similar study of the corresponding sodium phases: Na 0.5mo 2O 4, Na 0.9Mo 2O 4, Na 1.3Mo 2O 4 and Na 0.4(H 2O) 1.2 Mo 2O 4, is also presented.
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