MoS2 Nanosheets with Conformal Carbon Coating as Stable Anode Materials for Sodium-Ion Batteries
MoS2 Nanosheets with Conformal Carbon Coating as Stable Anode Materials for Sodium-Ion Batteries
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具有保形碳涂层的 MoS2 纳米片作为钠离子电池的稳定阳极材料
DOI：
10.1016/j.electacta.2017.09.128
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发表时间：
2017-11-10
影响因子：
6.6
通讯作者：
Zhu, Min
中科院分区：
文献类型：
--
作者：
Li, Xiang;Li, Junhao;Zhu, Min
具有保形碳涂层的 MoS2 纳米片是通过简单的化学气相沉积工艺获得的，采用乙醇蒸汽作为碳源。均匀的碳层是半石墨化的，有利于电子和离子转移的动力学，适应MoS2的体积变化，并减轻多硫化物在重复放电/充电循环过程中的溶解。作为钠离子电池负极材料，优化的碳涂层MoS2纳米片在0.1 Ag-1下100次循环后表现出500 mAh g(-1)的稳定可逆容量，即使在1 Ag-1下200次循环后仍保持351.6 mAh g(-1)。此外，通过电化学阻抗谱、循环伏安法以及扫描电子显微镜验证了增强的电子转移和稳定的结构。我们的结果表明，化学气相沉积碳涂层是有效的，有望提高负极材料的可逆 Na+ 存储性能。 (C) 2017 Elsevier Ltd. 保留所有权利。
MoS2 nanosheets with conformal carbon coating are achieved via a facile, chemical vapor deposition process, employing ethanol vapor as carbon source. The uniform carbon layers are semi-graphitized, which facilitate kinetics for electron and ion transfer, accommodate volume variation of MoS2, and relieve dissolution of polysulfide during repeated discharge/charge cycles. As anode materials for sodium-ion batteries, the optimized carbon coated MoS2 nanosheets show stable reversible capacity of 500 mAh g(-1) for 100 cycles at 0.1 Ag-1, and maintain 351.6 mAh g(-1) after 200 cycles even at 1 Ag-1. Furthermore, the enhanced electron transfer, and the stabilized structure are verified through electrochemical impedance spectroscopy, cyclic voltammetry, as well as scanning electron microscopy. Our results show that the carbon coating by chemical vapor deposition is efficient and promising to improve the reversible Na+ storage performance of anode materials. (C) 2017 Elsevier Ltd. All rights reserved.