Nanostructured Mn-Doped V₂O₅ Cathode Material Fabricated from Layered Vanadium Jarosite

We propose a nanostructured Mn-doped V 2 O 5 lithium-ion battery cathode material that facilitates cathodic charge transport. The synthesis strategy uses a layered compound, vanadium(III) jarosite, as the precursor, in which the Mn 2+ ions are doped uniformly between the vanadium oxide crystal layers. Through a two-step transformation, the vanadium jarosite was converted into Mn 2+ -doped V 2 O 5 . The resulting aliovalent doping of the larger Mn cations in the modified V 2 O 5 structure increases the cell volume, which facilitates diffusion of Li + ions, and introduces oxygen vacancies that improve the electronic conductivity. Comparison of the electrochemical performance in Li-ion batteries of undoped and the Mn 2+ -doped V 2 O 5 hierarchical structure made from layered vanadium jarosite confirms that the Mn-doping improves ion transport to give a high cathodic columbic capacity (253 mAhg –1 at 1C, 86% of the theoretical value, 294 mAhg –1 ) and excellent cycling stability.