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

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• 作者：Hongmei Zeng ; Deyu Liu ; Yichi Zhang ; Kimberly A. See ; Young-Si Jun ; Guang Wu ; Jeffrey A. Gerbec ; Xiulei Ji ; Galen D. Stucky
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：November 10, 2015
• 年：2015
• 卷：27
• 期：21
• 页码：7331-7336
• 全文大小：376K
• ISSN：1520-5002

文摘

We propose a nanostructured Mn-doped V₂O₅ 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 Mn²⁺ ions are doped uniformly between the vanadium oxide crystal layers. Through a two-step transformation, the vanadium jarosite was converted into Mn²⁺-doped V₂O₅. The resulting aliovalent doping of the larger Mn cations in the modified V₂O₅ 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 Mn²⁺-doped V₂O₅ hierarchical structure made from layered vanadium jarosite confirms that the Mn-doping improves ion transport to give a high cathodic columbic capacity (253 mAhg^鈥? at 1C, 86% of the theoretical value, 294 mAhg^鈥?) and excellent cycling stability.