Nanostructured Mn-Doped V_2O_5 Cathode Material Fabricated from Layered Vanadium Jarosite

Abstract

We propose a nanostructured Mn-doped V_2O_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_2O_5. The resulting aliovalent doping of the larger Mn cations in the modified V_2O_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_2O_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.

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