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Micro-MoS2 with Excellent Reversible Sodium-Ion Storage

机译:Micro-MoS2具有出色的可逆钠离子存储能力

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Low storage capacity and poor cycling stability are the main drawbacks of the electrode materials for sodium-ion (Na-ion) batteries, due to the large radius of the Na ion. Here we show that micro-structured molybdenum disulfide (MoS2) can exhibit high storage capacity and excellent cycling and rate performances as an anode material for Na-ion batteries by controlling its intercalation depth and optimizing the binder. The former method is to preserve the layered structure of MoS2, whereas the latter maintains the integrity of the electrode during cycling. A reversible capacity of 90mAhg(-1) is obtained on a potential plateau feature when less than 0.5 Na per formula unit is intercalated into micro-MoS2. The fully discharged electrode with sodium alginate (NaAlg) binder delivers a high reversible capacity of 420mAhg(-1). Both cells show excellent cycling performance. These findings indicate that metal chalcogenides, for example, MoS2, can be promising Na-storage materials if their operation potential range and the binder can be appropriately optimized.
机译:低存储容量和差的循环稳定性是用于钠离子(Na-离子)电池的电极材料的主要缺点,因为Na离子的半径较大。在这里,我们表明,微结构化二硫化钼(MoS2)通过控制其嵌入深度和优化粘合剂,可以作为Na离子电池的负极材料展现出高存储容量以及出色的循环和倍率性能。前一种方法是保留MoS2的分层结构,而后一种方法则在循环过程中保持电极的完整性。当每个配方单元少于0.5 Na插入到微型MoS2中时,在潜在的平稳特征上可获得90mAhg(-1)的可逆容量。用藻酸钠(NaAlg)粘合剂完全放电的电极可提供420mAhg(-1)的高可逆容量。两种电池均具有出色的循环性能。这些发现表明,如果可以适当地优化金属硫属元素化物(例如MoS2)的工作电势范围和粘合剂,那么它们将是有前途的Na储存材料。

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