Non-stoichiometric molybdenum oxides as cathodes for lithium cells: Part III. cells based on Mo 18O 52

Abstract

The non-stoichiometric Mo 18O 52 oxide, based on the MoO 3 structure, was tested as a cathode material in both primary and secondary Li cells. It may intercalate reversibly in its layered structure up to 1.2 Li/Mo (at 0.5–1.0 mA cm −2), so forming ternary phases. In the solid matrix Li + ion diffusion is relatively fast ( D≈10 −9 cm 2 s −1) and gives rise to a structure in which Li + is tetrahedrally coordinated by oxygen. This oxide shows a high rate capability and can also act as a cathode material for secondary batteries in the low-rate range. The resemblance to the parent oxide MoO 3 is obviously marked but differences were found with regard to the effect of additives and to the recharge efficiency, due to some structural differences.