Carbon-Stabilized Interlayer-Expanded Few-Layer MoSe2 Nanosheets for Sodium Ion Batteries with Enhanced Rate Capability and Cycling Performance.
Carbon-Stabilized Interlayer-Expanded Few-Layer MoSe2 Nanosheets for Sodium Ion Batteries with Enhanced Rate Capability and Cycling Performance.
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DOI：
10.1021/acsami.6b11230
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发表时间：
2016-11
影响因子：
9.5
通讯作者：
Yongchao Tang;Zongbin Zhao;Yuwei Wang;Yanfeng Dong;Yang Liu;Xuzhen Wang;J. Qiu
中科院分区：
文献类型：
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作者：
Yongchao Tang;Zongbin Zhao;Yuwei Wang;Yanfeng Dong;Yang Liu;Xuzhen Wang;J. Qiu
钠离子电池（SIBs）由于其丰富的储量和低成本的可及性而被认为是锂离子电池的一个有前途的替代品。迄今为止，追求高性能阳极材料仍然是sib面临的巨大挑战。在这项工作中，采用油酸（OA）功能化合成-聚多巴胺（PDA）稳定-碳化策略制备了碳稳定层间扩展的少层MoSe2纳米片（MoSe2@C），并对其结构，形态和电化学性能进行了仔细的表征，并与无碳MoSe2进行了比较。当作为钠离子半电池的阳极时，MoSe2@C在5 a g-1下表现出367 mA h g-1的显著增强倍率能力，在1 a g-1下表现出445 mA h g-1的高可逆放电容量，以及超过100次循环的长期循环稳定性。为了进一步探索其潜在的应用，我们将MoSe2@C组装成以Na3V2(PO4)3 （NVP）为正极材料的钠离子电池，在0.2 A g-1下循环100次后显示出421 mA h g-1的高可逆容量。这主要归功于独特的碳稳定层间扩展的少层MoSe2纳米片结构，该结构有利于电解质渗透到MoSe2纳米片内部，提高MoSe2纳米片之间的电荷转移效率，并适应充放电循环的体积变化。
Sodium ion batteries (SIBs) have been considered as a promising alternative to lithium ion batteries, owing to the abundant reserve and low-cost accessibility of the sodium source. To date, the pursuit of high-performance anode materials remains a great challenge for the SIBs. In this work, carbon-stabilized interlayer-expanded few-layer MoSe2 nanosheets (MoSe2@C) have been fabricated by an oleic acid (OA) functionalized synthesis-polydopamine (PDA) stabilization-carbonization strategy, and their structural, morphological, and electrochemical properties have been carefully characterized and compared with the carbon-free MoSe2. When evaluated as anode for sodium ion half batteries, the MoSe2@C exhibits a remarkably enhanced rate capability of 367 mA h g-1 at 5 A g-1, a high reversible discharge capacity of 445 mA h g-1 at 1 A g-1, and a long-term cycling stability over 100 cycles. To further explore the potential applications, the MoSe2@C is assembled into sodium ion full batteries with Na3V2(PO4)3 (NVP) as cathode materials, showing an impressively high reversible capacity of 421 mA h g-1 at 0.2 A g-1 after 100 cycles. Such results are primarily attributed to the unique carbon-stabilized interlayer-expanded few-layer MoSe2 nanosheets structure, which facilitates the permeation of electrolyte into the inner of MoSe2 nanosheets, promoting charge transfer efficiency among MoSe2 nanosheets, and accommodating the volume change from discharge-charge cycling.