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- 2017
一种新型的碳复合钼掺杂的钒氧化物纳米线钠离子电池正极材料
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Abstract:
摘要 近年来，由于锂资源逐渐紧缺而导致其成本增加，锂离子电池发展受到了限制. 作为一个有潜力的替代者，有着相似电化学机制且成本较低的钠离子电池则发展迅速. 但由于钠离子与锂离子相较有着更大半径，在钠离子脱嵌过程中，对大多数电极材料的晶体结构破坏严重. 因此，开发新型电极材料对钠离子电池的进一步发展尤为重要. 其中，层状钒氧化物作为正极材料被广泛研究. 在这项工作中，作者基于钒氧化物，引入钼元素并与碳复合，首次设计合成了一种新型的碳复合钼掺杂的钒氧化物纳米线电极材料，并获得了优良的电化学性能（在50 mA？g-1的电流密度下，最高放电比容量达135.9 mAh？g-1，并在循环75次后仍有82.6 mAh？g-1的可逆容量，容量保持率高达71.8%；在1000 mA？g-1的高电流密度下循环并回到50 mA？g-1后，可逆放电比容量仍能回复至111.5 mAh？g-1）. 本工作的研究结果证明，这种具有超大层间距的新型碳复合钼掺杂的钒氧化物纳米线是一种非常有潜力的储钠材料，并且我们的工作为钠离子电池的进一步发展提供了一定的理论基础
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