Fluorine substituted molybdenum oxide as cathode material for Li-ion battery

Molybdenum oxyfluoride MoO2.8F0.2 has been synthesized by solid-phase method. Its morphological and structural features were studied by scanning electron microscopy and X-ray powder diffraction. It was established that the substitution of the O atoms for F atoms in MoO3 structure leads to charge redistribution in the crystal lattice and conductivity increasing from 4.4·10−9Scm−1 to 1.8·10−6Scm−1. It was shown that molybdenum oxyfluoride characterized by higher discharge–charge stability in comparison with the oxide itself: 10-fold cycling in the range from 3.5 to 1.5V yields 160mAhg−1 and 120mAhg−1 for MoO2.8F0.2 and MoO3, respectively. •Orthorhombic MoO2.8F0.2 oxyfluoride was synthesized via solid-phase method.•MoO2.8F0.2 was investigated as cathode material for Li-ion battery.•Substitution of the O atoms for F atoms enhances the cycle performance.•Conductivity is increased by three orders of magnitude after atomic substitution.