Dai Hongmei, Tang Mi, Huang Jiming, Wang Zhengbang
Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.
ACS Appl Mater Interfaces. 2021 Mar 10;13(9):10870-10877. doi: 10.1021/acsami.0c21106. Epub 2021 Feb 24.
Molybdenum disulfide (MoS) with a graphite-like layer structure has attracted substantial interest as an anode material for sodium ion batteries (SIBs), but its inherent poor electrical conductivity and slow sodium ion transportation are the two important factors that limit its use in SIBs. Here, we report a general approach to synthesize a series of molecule-intercalated MoS with a precisely controlled interlayer distance of 0.62 to 1.24 nm in which the electrical conductivity could be also widely and finely adjusted from 1.3 × 10 to 3.5 × 10 S cm via the insertion of different molecules. By adjusting the interlayer space and enhancing the electrical conductivity, the highest initial sodium ion storage capacity of 465 mA h g (vs 195 mA h g for the pure MoS anode) and the highest capacity of 420 mA h g (vs 31 mA h g for the pure MoS anode) after 600 cycles at a rate of 100 mA g were obtained. The excellent performance is credited to the rapid Na and electron transport and higher material utilization derived from the synergistic effect of the expanded interlayer space and the higher electronic conductivity. The results provide some inspiration for the design and construction of superior layered anode materials for sodium-ion batteries.
具有类石墨层状结构的二硫化钼（MoS）作为钠离子电池（SIBs）的负极材料引起了广泛关注，但其固有的低电导率和缓慢的钠离子传输是限制其在SIBs中应用的两个重要因素。在此，我们报道了一种通用方法，用于合成一系列层间距精确控制在0.62至1.24 nm的分子插层MoS，其中通过插入不同分子，电导率也可在1.3×10至3.5×10 S cm范围内广泛且精细地调节。通过调节层间距和提高电导率，在100 mA g的电流密度下循环600次后，获得了最高初始钠离子存储容量465 mA h g（相对于纯MoS负极的195 mA h g）和最高容量420 mA h g（相对于纯MoS负极的31 mA h g）。优异的性能归因于层间距扩大和电子电导率提高的协同效应所带来的快速Na和电子传输以及更高的材料利用率。这些结果为设计和构建用于钠离子电池的优质层状负极材料提供了一些启示。
