Atomic layer deposition of crystalline epitaxial MoS2 nanowall networks exhibiting superior performance in thin-film rechargeable Na-ion batteries
Atomic layer deposition of crystalline epitaxial MoS2 nanowall networks exhibiting superior performance in thin-film rechargeable Na-ion batteries
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DOI：
10.1039/c7ta09399c
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发表时间：
2017
影响因子：
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通讯作者：
M. B. Sreedhara;Subhra Gope;B. Vishal;R. Datta;A. J. Bhattacharyya;C. Rao
中科院分区：
文献类型：
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作者：
M. B. Sreedhara;Subhra Gope;B. Vishal;R. Datta;A. J. Bhattacharyya;C. Rao
采用原子层沉积法在c-蓝宝石上生长了MoS 2单晶外延薄膜，无需后退火。薄膜的特点是使用各种显微镜和光谱技术。薄膜和衬底之间的晶体外延关系为：<$01 - 10 <$Al2O3 <$$> 11 - 20 <$MoS2和<$0001 <$Al2O3 <$$> 0001 <$MoS2。有趣的是，膜显示出高密度的微球，并表现出高的表面与体积比。如通过具有MoS 2作为活性电极的Na离子电池的性能所证明的，该网状物的高表面积导致优异的电化学特性。即使在没有导电和粘合剂添加剂的情况下，该电池在宽范围的工作电流下也表现出高容量、显着的稳定性、循环性和高倍率能力。MoS 2锂离子电池也具有类似的功能。
We have grown ultrathin crystalline epitaxial thin films of MoS2 on c-sapphire by employing atomic layer deposition, without the need for post-annealing. The films have been characterized by using various microscopic and spectroscopic techniques. The crystallographic epitaxial relationships between the films and the substrate are 〈01−10〉 Al2O3∥〈11−20〉 MoS2 and 〈0001〉Al2O3∥〈0001〉 MoS2. Interestingly, the films show a high density of nanowalls and exhibit a high surface to volume ratio. The high surface area of the nanowall network results in excellent electrochemical characteristics as demonstrated by the performance of the Na-ion battery with MoS2 as the active electrode. The battery exhibits high capacity, remarkable stability, cyclability and high rate capability over a wide range of operating currents, even in the absence of conducting and binder additives. The MoS2 Li-ion battery also exhibits similar features.