Nanostructured Mn-Doped V2O5 Cathode Material Fabricated from Layered Vanadium Jarosite,Chemistry of Materials

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Nanostructured Mn-Doped V2O5 Cathode Material Fabricated from Layered Vanadium Jarosite
Chemistry of Materials ( IF 7.2 ) Pub Date : 2015-10-22 00:00:00 , DOI: 10.1021/acs.chemmater.5b02840
Hongmei Zeng _{1,

2} , Deyu Liu ₁ , Yichi Zhang ₁ , Kimberly A. See ₁ , Young-Si Jun ₁ , Guang Wu ₁ , Jeffrey A. Gerbec ₃ , Xiulei Ji ₄ , Galen D. Stucky _{1,

3}

Affiliation

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^–1 at 1C, 86% of the theoretical value, 294 mAhg^–1) and excellent cycling stability.

中文翻译：

层状钒铁矾土纳米掺杂Mn掺杂V ₂ O ₅阴极材料

我们提出了一种纳米结构的Mn掺杂的V ₂ O ₅锂离子电池正极材料，可促进阴极电荷的传输。合成策略使用层状化合物，即钒（III）黄钾铁矾作为前驱体，其中Mn ²⁺离子均匀掺杂在氧化钒晶体层之间。通过两步转化，钒黄钾铁矾转化为掺杂Mn ^2+的V ₂ O ₅。改性后的V ₂ O ₅结构中较大的Mn阳离子的异价掺杂，增加了电池体积，从而促进了Li ^+的扩散。离子，并引入氧空位，以提高电子电导率。比较未掺杂的锂离子电池和由层状钒黄铁矿制成的Mn ²⁺掺杂的V ₂ O ₅分层结构的电化学性能，证实了Mn掺杂改善了离子传输，从而提供了高的阴极哥伦布容量（253 mAhg ^–在1C时为¹，理论值的86％为294 mAhg ^–1），并具有出色的循环稳定性。

更新日期：2015-10-22

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