Shi Yumeng, Wang Ye, Wong Jen It, Tan Alex Yuan Sheng, Hsu Chang-Lung, Li Lain-Jong, Lu Yi-Chun, Yang Hui Ying
Pillar of Engineering Product Development, Singapore University of Technology and Design, Singapore 138682, Singapore.
Sci Rep. 2013;3:2169. doi: 10.1038/srep02169.
Two dimension (2D) layered molybdenum disulfide (MoS2) has emerged as a promising candidate for the anode material in lithium ion batteries (LIBs). Herein, 2D MoSx (2 ≤ x ≤ 3) nanosheet-coated 1D multiwall carbon nanotubes (MWNTs) nanocomposites with hierarchical architecture were synthesized via a high-throughput solvent thermal method under low temperature at 200°C. The unique hierarchical nanostructures with MWNTs backbone and nanosheets of MoSx have significantly promoted the electrode performance in LIBs. Every single MoSx nanosheet interconnect to MWNTs centers with maximized exposed electrochemical active sites, which significantly enhance ion diffusion efficiency and accommodate volume expansion during the electrochemical reaction. A remarkably high specific capacity (i.e., > 1000 mAh/g) was achieved at the current density of 50 mA g(-1), which is much higher than theoretical numbers for either MWNTs or MoS2 along (~372 and ~670 mAh/g, respectively). We anticipate 2D nanosheets/1D MWNTs nanocomposites will be promising materials in new generation practical LIBs.
二维（2D）层状二硫化钼（MoS₂）已成为锂离子电池（LIBs）负极材料的一个有前景的候选材料。在此，通过高通量溶剂热法在200°C的低温下合成了具有分级结构的二维MoSₓ（2≤x≤3）纳米片包覆的一维多壁碳纳米管（MWNTs）纳米复合材料。具有MWNTs骨架和MoSₓ纳米片的独特分级纳米结构显著提升了LIBs中的电极性能。每一片MoSₓ纳米片都与MWNTs中心相连，使电化学活性位点最大程度地暴露，这显著提高了离子扩散效率，并在电化学反应过程中适应体积膨胀。在50 mA g⁻¹的电流密度下实现了非常高的比容量（即>1000 mAh/g），这比MWNTs或MoS₂各自的理论值（分别约为372和670 mAh/g）高得多。我们预计二维纳米片/一维MWNTs纳米复合材料将成为新一代实用LIBs中有前景的材料。
