Intercalation of Magnesium into a Layered Vanadium Oxide with High Capacity
Intercalation of Magnesium into a Layered Vanadium Oxide with High Capacity
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DOI：
10.1021/acsenergylett.9b00788
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发表时间：
2019-07-01
影响因子：
22
通讯作者：
Cabana, Jordi
中科院分区：
文献类型：
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作者：
Yoo, Hyun Deog;Jokisaari, Jocob R.;Cabana, Jordi
虽然传统上α-V2 O 5被认为是一种有前途的氧化物，可以在高电位下可逆地嵌入高含量的Mg 2+，但最近的报告表明，即使在中等干燥的非水电解质中，先前观察到的电化学活性也是由H+而不是Mg 2+的嵌入主导的。因此，氧化物嵌入Mg 2+的固有功能性仍然存在疑问。通过在化学和阳极稳定的离子液体电解质中进行电化学，我们报告说，在110摄氏度下，层状α-V2 O 5确实能够可逆地嵌入每单位分子式1摩尔的Mg 2+，以累积超过280 mAh g（-1）的容量。多模态表征证实插入镁离子通过探测元素，氧化还原，和形态的氧化物所经历的变化。在110 ℃循环后，室温下的电化学活性显著增强。结果更新的前景，功能镁可充电电池超过目前的锂离子电池的能量密度的水平。
While alpha-V2O5 has traditionally been considered as a promising oxide to reversibly intercalate high levels of Mg2+ at high potential, recent reports indicate that previously observed electrochemical activity is dominated by intercalation of H+ rather than Mg2+, even in moderately dry nonaqueous electrolytes. Consequently, the inherent functionality of oxides to intercalate Mg2+ remains in question. By conducting electrochemistry in a chemically and anodically stable ionic liquid electrolyte, we report that, at 110 degrees C, layered alpha-V2O5 is indeed capable of reversibly intercalating 1 mol Mg2+ per unit formula, to accumulate capacities above 280 mAh g(-1). Multimodal characterization confirmed intercalation of Mg2+ by probing the elemental, redox, and morphological changes undergone by the oxide. After cycling at 110 degrees C, the electrochemical activity at room temperature was significantly enhanced. The results renew prospects for functional Mg rechargeable batteries surpassing the levels of energy density of current Li-ion batteries.