Rationally Designed Vanadium Pentoxide as High Capacity Insertion Material for Mg‐Ion,Advanced Functional Materials

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Rationally Designed Vanadium Pentoxide as High Capacity Insertion Material for Mg‐Ion
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-15 , DOI: 10.1002/adfm.202003518
Ayan Mukherjee _{1,

2} , Sarah Taragin _{1,

2} , Hagit Aviv _{1,

2} , Ilana Perelshtein ₂ , Malachi Noked _{1,

2}

Affiliation

Owing to high energy density and economic viability, rechargeable Mg batteries are considered alternatives to lithium ion batteries. However besides the chevrel phase, none of the conventional inorganic cathode materials demonstrate reversible intercalation/deintercalation of Mg⁺² ions in an anhydrous electrolyte system. The lack of high voltage and high capacity cathode frustrates the realization of Mg batteries. Previous studies indicate that vanadium pentoxide (V₂O₅) has the potential to reversibly insert/extract Mg ions. However, many attempts to utilize V₂O₅ demonstrate limited electrochemical response, due to hindered Mg ion mobility in solid. Here, monodispersed spherical V₂O₅ with a hierarchical architecture is rationally designed, through a facile and scalable approach. The V₂O₅ spheres exhibit initial discharge capacity of 225 mA h g⁻¹ which stabilizes at ≈190 mA h g⁻¹ at 10 mA g⁻¹, much higher than previous reports. The V₂O₅ spheres exhibit specific discharge capacity of 55 mA h g⁻¹ at moderate current rate (50 mA g⁻¹) with negligible fading after 50 cycles (≈5%) and 100 cycle (≈13%), while it retains ≈95% columbic efficiency after 100 cycles demonstrating excellent stability during Mg⁺² ion intercalation/deintercalation. Most interestingly, exact phase and morphology are completely retained even after repeated Mg⁺² ion intercalation/deintercalation at different current rates, demonstrating pronounced electrochemical activity in an anhydrous magnesium electrolyte.

中文翻译：

合理设计的五氧化二钒作为镁离子的高容量插入材料

由于高能量密度和经济可行性，可再充电镁电池被认为是锂离子电池的替代品。然而，除了雪佛尔相之外，没有常规的无机阴极材料在无水电解质体系中显示出Mg ⁺²离子可逆的嵌入/脱嵌。缺乏高电压和高容量的阴极使镁电池的实现受挫。先前的研究表明，五氧化二钒（V ₂ O ₅）具有可逆地插入/提取Mg离子的潜力。然而，由于阻碍了Mg离子在固体中的迁移，许多利用V ₂ O _5的尝试都显示出有限的电化学响应。这里，单分散球形V ₂ O通过一种简便且可扩展的方法，合理地设计了具有分层体系结构的₅。在V ₂ ø ₅球体呈现225毫安汞柱的初始放电容量^-1，其稳定在≈190毫安汞柱^-1以10mA克^-1，比以前报道的高得多。V ₂ O ₅球在中等电流速率（50 mA g ^-1）下表现出55 mA hg ^-1的比放电容量，经过50次循环（≈5％）和100次循环（≈13％）后，褪色微不足道，而保留100次循环后≈95％的柱效，证明在Mg ⁺²期间具有出色的稳定性离子嵌入/脱嵌。最有趣的是，即使在不同电流速率下反复进行Mg ⁺²离子嵌入/脱嵌之后，确切的相和形态也可以完全保留，这表明在无水镁电解质中具有明显的电化学活性。

更新日期：2020-09-18

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